Also added was the #48 casting number heads with a 68cc (4.15cuin) chamber for higher compression, along with larger 2.11 and 1.77in (54 and 45mm) valves. From a performance perspective, the 2+2 is pretty impressive. Every torque specification should be in this table, however if there is one missing, please Contact Me and I will get you the spec and add it to the table. Styling for Status. Shipping to: 98837. Displacement began at 287-cubic-inch (4.7L) and grew as large as 455-cubic-inch (7.5L) by 1970. . Next time we will cover the induction system and the dyno testing to see if Jim meets his goal. For 1956 the V8 was bored out to 3.9375in (100.01mm), increasing displacement to 316.6cuin (5.2L). Pontiac did not release official power ratings for this engine, saying only that it had more than 300hp (224kW). After outselling Oakland, Pontiac became the sole survivor of the two by 1932. Today, they have an average value of $430,000 in #3 (Good) condition, while the best in the world is worth about $550,000. Primary tube diameter: 1.75-in The last was the 421 HO and included a high-output camshaft and valve train. [9], The W72 engine was standard in all 1977 Pontiac Can Ams (bar the 1977 Can Ams sold in California/High Altitude states which received the L80 Oldsmobile 403) and was optional in all 1977-79 Pontiac Firebird Formula and Trans Am models. Jets, Primary: Center #64 adjust power valvespring for 12 Hg at 1,000 rpm The 455 was used through 1976 when it, as with many other large displacement engines, was discontinued as manufacturers moved to smaller, more efficient models, even in their full size car lines. Headers: Hooker Super Comp (for dyno test) In light of this, the 'Year' entry, as indicated by the chart below, may actually represent the year that the heads were cast, versus the year that they were actually installed on an automobile. 1966 Pontiac Catalina The 287 was an "oversquare" engine with a bore and stroke of 3+34in 3+14in (95.3mm 82.6mm), for a total displacement of 287.2cuin (4.7L). Buckets and a console were added to the top-line Catalina interior, which could be optioned with a sport steering wheel and instrumentation that included a tachometer and oil-pressure gauge. According to the engineers who worked on the project, the SOHC 421 engines produced around 625hp and were capable of turning 7,000 rpm. 1966 Pontiac 2+2 $64,995. For '65, the 421-cid V-8 became a standard part of the option package, and for '66, Pontiac made the 2+2 a separate model, still based on the Catalina two-door hardtop or convertible.Flamboyantly styled and expansively proportioned, the 2+2 was unbeatable for sheer presence. Idel RPM Automatic In Drive Notes; 326: 1964: 45S: 0.035: . The head design was incorporated from the earlier 1970's 350 Pontiac heads, and could satisfy emissions in all states except for high-altitude emissions states and California. SELLER Glendale, Arizona 85305. While all this sounds great, remember the engine will have to retain the small 1.92-inch intake valve because chamber space is too tight for larger ones. Pontiac first offered the 2+2 as a Catalina engine, suspension, and trim group in 1964. Other dimensional factors such as the wheel base, curb weight and length were largely unchanged. This included the ESC (Electronic Spark Control) distributor and controller borrowed from the 301 Turbo, which allowed for higher timing without the penalty of engine damaging pinging or preignition. Distributor: '61 Delco cast-iron with direct oiling Pontiac introduced the OHC 6 in two flavors for '66: a base engine with a one-barrel carburetor that developed 165 hp at 4700 rpm, and a sportier version with a 10.5:1 compression ratio, a high-lift cam, a split exhaust manifold, and GM's new four-barrel Quadrajet carburetor (below). Pontiac Heads; Pontiac Engine Torque Specs; Pontiac Cars (Body Types) Pontiac Engine Information; Instruction Sheets; Compression Calculator; Ask a Tech Question; Customer Service. In 1968 the 326 was replaced by the similarly 389-derived 350, which used a 3+78in (98.4mm) bore and 3+34in (95.3mm) stroke for a total displacement of 353.8cuin (5,798cc). The 1955-up Pontiac V8 that finally reached the public was an overhead valve engine with cast iron cylinder heads and block and wedge-shaped combustion chambers. The shaker wore the decals "455 H.O." . Pontiac offered Tri-Power on select models and engines (347, 370, 389, and 421 CID) from 1957 through 1966, when it was finally . Not long before the model year introduction, Pontiac management decided that the entire line would be V8-powered. Only 157 Ram Air IV Firebirds, including 55 Trans Ams, were built for 1969. It was rated at 360hp @4300 RPM in the GTO and 370 @ 4600 RPM in the Grand Prix and other full-size Pontiacs. [7] Though listed as slightly less powerful than some high-performance iterations of the 400 (such as the 366hp (273kW) Ram-Air), the 455 had 500lbft (678Nm) of torque, 55 more lbft (75Nm). Pontiac RAIII/IV Engine parts collection Price $14000.00. Fuel pump: Will use 110-gph Carter The 421 badging was standard on the 2+2, the 421 H.O. V-8 (coded WG for stick or YH for auto) was the 2+2's base engine. The 421 also marked the end of the option for a forged-steel crankshaft. This simply meant that Pontiac installed both the SD-389 and SD-421 into vehicles on its assembly line. street engine. 1968 - 400 Ram Air I and 428HO Code 37" Ram Air I and. . The W72 offered many improvements over the standard L78 400 Pontiac. In 1963 Pontiac dropped the Buick division built 215 cu. . Beginning in 1967 casting numbers moved to the rear of the block just behind cylinder #8. Primary tube length: approximately 31.00 inches Deck Height: 10.215-in Engine Displacement: 432 ci The 400 2-barrel kept the 17 degree valve angles for '67; starting in '68 all Pontiac V8s went to the 14 degree valve angle. 1966 Pontiac Catalina technical specifications and data. Unlike previous enlargements of Pontiac V8s, it did not replace the 389. Maximum flow at 28 inches of water The engine compartment of this concours Catalina is beautifully finished. Only about 2000 like this one were built with 4 speed Muncie transmissions. in. Pontiac successfully competed against more-expensive inline four-cylinder models with their inline flathead six-cylinder engines. On this Wikipedia the language links are at the top of the page across from the article title. SPECIFICATIONS. Pontiac continued using its round-port cylinder-head design for 1971-'72 on the 455 HO. 421 CID V8 - 4BBL - Automatic - P.S. Wearing a revised GM B-body semi-fastback shape, the 2+2 option delivered a 421-cu.in. The 301T block was significantly more durable than the standard 301 block and received a thicker bottom end. Muscle cars wouldn't have much muscle without horsepower -- but what exactly is horsepower? ", https://tran-zam.com/fhistory/1977Engines.aspx, "Hitman's Pontiac Trans Am Site - WS6 and WS7", https://tran-zam.com/fhistory/1978Engines.aspx, https://tran-zam.com/fhistory/1975Engines.aspx, "Unsung Muscle: '75 455 HO Pontiac Trans Am", https://tran-zam.com/fhistory/1981Engines.aspx, "Directory Index: Pontiac/1967 Pontiac/1967_Pontiac_Performance_Brochure", "609ci Pontiac Ram Air V - Chief Stomp 'Em", Pontiac experimental V8 427 Hemi TOHC Tamrazs Parts (800) 442-4601, "McKellar's Masterpiece: The Pontiac Overhead Cam 421 V8", https://en.wikipedia.org/w/index.php?title=Pontiac_V8_engine&oldid=1136467635, Articles needing additional references from January 2010, All articles needing additional references, Articles that may contain original research from October 2016, All articles that may contain original research, Articles needing cleanup from September 2022, Articles with bare URLs for citations from September 2022, All articles with bare URLs for citations, Articles covered by WikiProject Wikify from September 2022, All articles covered by WikiProject Wikify, Articles with multiple maintenance issues, Articles with unsourced statements from December 2008, Articles with unsourced statements from April 2021, Articles with unsourced statements from February 2018, Wikipedia articles needing clarification from April 2021, Articles with unsourced statements from July 2016, Articles that may contain original research from September 2018, Articles with unsourced statements from March 2018, Articles to be expanded from February 2020, Articles with empty sections from February 2020, Creative Commons Attribution-ShareAlike License 3.0, 7.9:1, 8.0:1, 8.4:1, 8.5:1, 8.6:1, 8.9:1, 10.0:1, 10.25:1, 10.5:1, 10.75:1, 11.0:1, Two-barrel carburetor, 7.9:1 compression, 192hp (143kW) @ 4400rpm, 297lbft (403Nm) @ 2800rpm, Four-barrel carburetor, 8.9:1 compression, 216hp (161kW) @ 4800rpm, 315lbft (427Nm) @ 2800rpm, Two-barrel carburetor, 8.9:1 compression, 205hp (153kW) @ 4600rpm, 294lbft (399Nm) @ 2600rpm, Four-barrel carburetor, 8.9:1 compression, 227hp (169kW) @ 4800rpm, 312lbft (423Nm) @ 3000rpm. or Best Offer. Pontiac differed from other GM Divisions and most other manufacturers in producing only a single small block V8, rather than adding a larger big block to its line-up. For 1971, Pontiac introduced another High Output (HO) version with standard internal parts, a reinforced block with four-bolt main bearing caps, and improved cylinder head design with 18-inch taller (3.2mm) intake ports and special round exhaust ports for better breathing, yet still making just 335hp (250kW) gross (or 310hp (231kW) in the more accurate SAE Net system). 18 watchers This 356hp monster is backed by a 4-speed manual transmission, while the Pontiac also features power steering and power brakes. The development of this V8 dates back to 1946, when engineers began considering new engine designs for postwar cars. In addition to the inline 6, Pontiac used the Oakland V8 for one year, 1932, debuting the Pontiac straight-8 engine in 1933. Year: CU IN: Casting # 1967: 326. Initially marketed as a 287cuin (4.7L), it went on to be manufactured in displacements between 265cuin (4.3L) and 455cuin (7.5L) in carburated, fuel injected, and turbocharged versions. For 1958 the V8's bore was increased again to 4+116in (103.2mm), increasing displacement to 369.4cuin (6.1L). In 1967, the cylinder head design was improved for the 400 4-barrel engine. By comparison, the factory 421 H.O. The 421 SD became factory installed in 1962 and in 1963 a street version became available from the factory with a dual four-barrel or three two-barrel Tri-Power carburetion. For '65, the 421-cid V-8 became a standard part of the option package, and for '66, Pontiac made the 2+2 a separate model, still based on the Catalina two-door hardtop or convertible. The earlier 1975-78 blocks had metal shaved from the journals and bottom end as well as a decrease in the nickel content of the block in an attempt to decrease the overall weight of the vehicle to help alleviate emissions and cost. Head bolts do not pull on the cylinder wall causing distortion. Pontiac V8 Engine Tune-Up and Torque Specifications. Like the 326, it was offered in both 2-barrel and 4-barrel versions. 1967 - 400 Ram Air Code 97. Pontiac Engine Torque Specifications. The 421 used the same 4.120-inch bore but used the 4.0-inch crank from the 421 it replaced. This was the beginning of factory supplied performance items such as 4 bolt main bearings and windage trays to reduce friction from crankcase oil. Calling into play enormous power and a decent 55/45 weight distribution, the 2+2 could be launched with little tire spin and guided through corners with alarming efficiency. Late in the model year the Ram Air 455 HO was made an available option for those GTOs with the optional "The Judge" package. 1966 yk 421 376 a 3x2 1967 zg 230 165 a 1 1967 zm 230 165 a 1 1967 zk 230 165 3 m 1 1967 zs 230 165 3 m 1 . 301 Turbo (210hp, 157kW), (with the 5th VIN character being a "T". It featured a smaller bore of 3+34in (95.3mm) coupled with the same 3in (76.2mm) stroke of the 301 (same bore and stroke used by Chevrolet when the first small block motor was introduced in 1955). The 421 SD Tri-Power engine offered during these years produced the highest horsepower of any motor in the Pontiac V8 lineup at 376 bhp. Timing chain: LPC, double rollerINDUCTION It's well documented that an internal combustion engine is nothing more than an air pump. 301 2-barrel (135hp, 101kW), (5th character of the, 301 4-barrel (150hp, 112kW), (5th character of the. Pontiac first offered three two-barrel carburetors in 1957 and the Tri-power set up was an option on the GTO from 1964-66. Centerline: 110-deg The most valuable Pontiac GTO is the 1969 Judge convertible with the 370-hp Ram Air IV engine. Engine block and cylinder heads were cast at Saginaw Metal Casting Operations then assembled at Tonawanda Engine before delivery to Pontiac Assembly for installation. While production of 196970 A-body Ram Air IV cars was low at just 1563 units(759 1969 GTOs including 302 Judges, and 804 1970 GTOs including 397 Judges) 1969 and 1970 model year F-body Ram Air IV cars were even rarer at just 245 total units produced. In 1967, the Pontiac 2+2 became an option on the . Ultimately Pontiac produced only 295 1973 SD-455 Firebirds (252 Trans Am, 43 Formula). Hewing to GM's standing edict limiting engine size to 400 cu in for its midsize and smaller cars, the 360hp (268kW) (underrated),[citation needed] the 400 cubic inch Ram Air V-8 was the most powerful and advanced option available in the 1967 GTO and Firebird. Ram Air induction was optionally available with the 455 HO in the Firebird Formula (standard on Trans Am), and the 2-door LeMans (including GTO). Pontiac's SCCA Trans-Am program was promising, with race-ready engines producing 475hp (354kW) to 525hp (391kW), however the series General Competition Rules required the manufacturer to produce no less than 250 vehicles with the 303. By 1965 and 1966 the same combinations would be rated at 338hp (252kW) for the 4bbl and the two Tri-Power versions would be rated at 356hp (265kW) and the H-O version at 376hp (280kW). PONTIAC : 1965-75Tune-up Specifications : Year: Engine Car Model: Spark Plug Type (AC) - Gap: Point Gap: Dwell Angle: . Specs datasheet with technical data and performance data plus an analysis of the direct market competition of Pontiac Catalina Vista 421HO Trophy V-8 Tri-Power 4-speed in 1964 the model with 4-door hardtop sedan body and V-8 6902 cm3 / 421.2 cui, 276 kW / 375 PS / 370 hp (max) offered since October 1963 for North America U.S. special version. Two tri-power 421s were optional, one with 356 bhp, the other with 376. Valve seals: U.S. Seal The new-for-1965 "Venturi" body shape and curved side glass were carried over with updates front and rear. An innovative design feature was mounting the rocker arms on ball pivots on studs set into the cylinder head, rather than using a separate rocker shaft. [2] This was the engine installed in the Pontiac Executive line of large cars[3] and its largest station wagon, the Pontiac Safari. The main innovation of the Pontiac engine was reverse-flow cooling and the stamped rocker-arm system, which had been devised by Pontiac engineer Clayton Leach in 1948. Read. This was a completely stock car on loan from a private owner for the test. 63 421 SD: 64: D-Port: 2.02/1.76: 77: 65 GTO, 65 421 HO: 65: D-Port: INTAKE MANIFOLD BOLT PATTERN IS THE SAME FOR ALL 65-79 HEADS. Duration at .050: 247/252-deg The manuals had Hurst shifters. The main upgrade for the engine was the ESC, (Electronic Spark Control)[15] which provided slightly more power at 170hp (127kW) with 4.9L (299cuin) for the 19801981 model years. This money bought a potent 389 V-8 with 267-283 bhp . Forged steel 6.625in (168.3mm) rods (Ram Air V style), Large-valve heads (valve diameter): 2.4in (61mm) intake, 2in (51mm) exhaust, Small-valve high-RPM head (valve diameter) 2.19in (56mm) intake, 2in (51mm) exhaust. The 1972 455 HO was available in the Firebird (optional in Formula; standard in Trans Am) and 2-door LeMans (including those with the GTO option) and LeMans Sport convertible. . If you enjoy the videos and would like to Sponsor me on Patreon, my Creator link is https://www.patreon.com/MyCarStoryWithLouOn "My Car Story" we're in Huntl. Engine Oil: 95 ft-lbs. Block casting # 9773157. [19], Parts for Ram Air V engines are not readily available. Standard motor was the 421 4 barrel with 342 horsepower, which was no slouch itself. Engine Block Date Code. In 1961 Pontiac continued to push the horsepower upwards with the release of the 421 engine. Bore/Stroke ratio: 1.04:1 Type Size Carb Horse Power Tourqe; Tri-Power: 389ci: 3x2bbl: 360 hp @ 5200 rpm: 424 lb-ft @ 3600 rpm: Base 8 . [8] All of these improvements provided the W72 with a power rating of 200hp (203PS; 149kW) at 3600 rpm and 325lbft (441Nm) of torque at 2400 rpm, while the standard L78 400 only produced 180hp (182PS; 134kW) at 3600 rpm and 325lbft (441Nm) of torque at 1600 rpm. This same camshaft was also used in Pontiac's 19691970 RA IV production cars. Only one is known to survive today. The next 1 or 2 numbers represent the date, and the last number is the year. Around January 1966 Pontiac took the next step and began offering as a factory option the XS-code engine. Rods: Howard's billet 4340 certified steel, stock 6.625-in, floating pins Only 630 Bonnevilles were produced for 1957, all of them fuel-injected. which was seen on the hood of the 1957 Daytona Grand National winning car driven by Cotton Owens. A panel covers the dash opening where the radio would have been on a standard Catalina. The tri-power equipped XS-code 389 was shipped with the Ram Air pan in the trunk, and the dealer had to fit it and cut out the underside of the hood scoop to make it functional. Intake manifold: Original '64 PMD tri-power Torque: See Part 2 Regarding Crower's upgrade suggestions for its . Specifications listing with the performance factory . In addition to the more refined cylinder heads, block casting reinforcements in the lifter galley and main bearing oil pan rail area, it had forged connecting rods with larger 716-inch-diameter (11mm) bolts. Pontiac began as a "companion make" to the Oakland division of the General Motors line of automobiles in 1926. It is probably best known for it's Tri-power option, which was optional on GTO's from 1964 through 1966.. Ever wonder what it would take to increase that number by 100? Two different cylinder-head castings were used for the 1962 model year, both with a combustion chamber volume of 68cc (4.15cuin) to produce an 11.0:1 compression ratio. Dry weight ranged from 590 to 650 pounds (270 to 290kg), depending on displacement and year. In basic 2-barrel form it produced 290 horsepower and 428ft. pounds of torque in 1968. Intake: 218 cfm at 0.500-in Turn adjusting screw in Clockwise until engine misfires, then turn screw out 1/2 turn . [citation needed] It was the first engine that incorporated Pontiac's round-port head design in a production vehicle, however the intake port was the same as other D-port heads, leaving a head which exhaust port could nearly match the intake at high valve lifts. HOT ROD and CAR AND DRIVER) were fitted with the Ram Air IV-spec camshaft and functional hood scoops - a fact that has been confirmed by several Pontiac sources. It requires a compression ratio of at least 10.25:1. - P.B. It was rated at 475hp (354kW). It used the "744" camshaft (301-313) in the earlier manual trans versions, later downgraded to the "068" version, and the 288/302 duration cam with automatic transmission. Chamber: Closed, special to PMD, 70 cc One of the key upgrades were the 6x4 heads. He wanted to confirm his parts are up to the task of holding the cylinder pressure that creates horsepower. It included a new camshaft with duration increased from 288/302 (No. Approximately 6,000 2+2's were built in 1966, the only year the 2+2 was its own model. The 428 was increased to 456.12cuin (7,474cc) in 1970. Standard in the Firebird Trans Am, it was still a rare engine. Along with proper parts selection, accurate machining and assembly are also important. Free shipping on many items | Browse your favorite brands | affordable prices. For the first time, Pontiac offered Tri-Power, three two-barrel carburetors with a sequential linkage (replacing the previous dual-quad set-up). SB International 00958 1963-1966 Pontiac 389 421 Engine 1.920" Intake Valves (Fits: 1966 Pontiac GTO) $7.98. The 389 was the standard engine for the Pontiac Grand Prix and Pontiac Bonneville and installed in the Pontiac GTO through 1966. During 19511952, Pontiac had 23 287cuin (4.7L) V8-equipped 1953 model production prototypes running tests on the GM proving grounds. The fuel-injected engine became an option on any Pontiac model, carrying a staggering price tag of $500 (almost 15% of the car's base price). The other major difference between the "typical" Pontiac engine of the time was that this one used the large . Stock Pontiac Engine Specs. The W72 Performance Package also included an upgrade to the rear differential ratio, setting the rear gear ratio to 3.23 for all 1977 and 1979 W72 Firebirds, with the exception being 3.42 for 4-speed equipped W72 Firebirds in 1978 only. Thus in March 1973 Pontiac eliminated a timing solenoid that gave full vacuum advance and disabled the EGR valve in high gear after a period of time that happened to exceed the running time of the EPA testing cycle. While the 400 offered excellent power in the GTO (360 horses and 445 lb-ft of torque in 1968), Pontiac turned to what it called 'big journal' engines for the muscle machine's next upgrade. With an identical bore and stroke of 4+116in (103.2mm) and 3+34in (95.3mm) it was precisely half the displacement of the 389 and shared numerous parts with the V8,[1] yet weighed considerably more than half as the engine lower half and block casting were not simply divided down the middle. As Pontiac still wanted to offer a performance motor to compete in the performance market, they looked back to the 400 Pontiac and how it could be improved to offer greater performance while meeting CAFE standards. VEHICLE TYPE . The Ram Air IV replaced the Ram Air II in 1969. These guys lived by mathematics since every function of an engine that converts chemical to mechanical energy can be assigned a number. superior_queens (3,035) 100%. A camshaft with 301/313 degrees of advertised duration, 0.407-inch (10.3mm) net valve lift, and 76 degrees of valve overlap was specified for actual production engines in lieu of the significantly more aggressive Ram Air IV-spec camshaft that had originally been planned for the engine (initially rated at 310hp (231kW) with that cam), but ultimately proved incapable of meeting the tightening emissions standards of the era with sufficient margin to satisfy Pontiac emission engineers given expected volume production variations. Windage tray: Original PMD '70 455, fabricate fit, no bosses at cap #2 It also sports the four-speed manual, limited . With some WS6 "Trans Am Special Performance Package" bundles in 1978, the W72 engine was incorporated with the WS6 option group and not listed on the dealer order invoice. Flamboyantly styled and expansively proportioned, the 2+2 was unbeatable for sheer presence. Ellingson Motorcars (877) 638-7170. For 1967 only Pontiac called this engine the Quadra-Power 428. Still, it was the strongest American engine offered that year. 544127 with larger 2.02/1.76-inch (51/45mm) valves entered production. Effectively, Pontiac's V8s were all small blocks, sharing the same connecting rod length 6.625 in (168.3mm) (except for the later short deck 301 and 265 produced in the late 1970s and early 1980s before Pontiac adopted universal GM engines). The 421 was first availabe in a SD (Super Duty) model that was built for racing. The valve angle was reduced from 17 degrees to 14 degrees for better breathing. cam specs out at 215/225-degrees duration at 0.050 and has just 0.407/0.407 lift with the factory 1.50:1 rockers. 744) and a new valve spring package with dampers to positively control valve action. The short-deck block and different intake ports also required the design of a new intake manifold. It would later become known colloquially as the "Ram Air III", though Pontiac never called it by that name. The overhead-cam six-cylinder engine was new for 1966 and the standard engine in the Tempest and Tempest Custom. When fitted with other high-airflow components, it produced a good balance of low-end torque and higher-RPM power. He says the Tri-Power setup modified with the addition of the larger '66 center carb will flow 1,050 cfm. Pre-Owned. Horsepower: See Part 2 Both Randy and Stan were aware of the . Though never factory-installed in any car, the ultimate engine of the Ram Air line of engines was the tunnel-port Ram Air V. In 1969 Pontiac created four versions of the Ram Air V engine: a 303cuin (5.0L) short deck version for SCCA Trans-Am racing, a 366cuin (6.0L) variant for NASCAR, a 400cuin (6.6L) version for street use in GTOs and Firebirds, as well as a 428cuin (7.0L) adaptation for drag racing. . It was implemented as further development of a cost-effective, more fuel efficient V8 derivative of the 301 V8 for the CAFE requirements. Optional power was the 421/356 with Tri-Power or the 421 HO putting out 376 horses with Tri-Power. As a result, peak horsepower dropped from 310 to 290, though torque increased from 390 to 395lb. The 1979 Firebird model line was the last year for the Pontiac 400, and by this point not only was it required with the 4-speed manual transmission, it also required the WS6 Special Handling Package as mandatory equipment. For 1969-1970 GTO the 400 HO included driver operable Ram Air induction and was renamed "400 Ram Air" for 1969 and just "Ram Air" for 1970. It was rated at 376bhp in 1967 and 390bhp in 1968 and 1969. All 1980 Trans Ams received this engine as standard with the option to delete this engine choice as a credit option for the standard L37 301. $6.49 shipping. The GTO came with a four-barrel 389 V8 with 335 horsepower. Two four-barrel carburetors, 10.5:1 compression, 285hp (213kW) @ 5100rpm, 330lbft (447Nm) @ 2600rpm. Pushrods: LPC chrome moly The XS-code 389 was still rated at 360bhp at 5,200 rpm, same as the more common WS-coded Tri-Power 389, but performance was noticeably improved on acceleration runs. This chart covers Pontiac V8 Engines; 265, 301, 326, 350, 389, 400, 421 . The "670" head was a 1967-only casting, and the only PMD head to have a closed chamber with the new 14 degree valve angle. It featured the "744" 301/313 camshaft, which offered more duration and overlap than the "HO". All L78 Pontiac 400 equipped cars received the same shaker decal as the L80 Oldsmobile 403, being "6.6 LITRE". Preparation: File-fit for end gap if needed, wash The 389 was the standard engine on the GTO up to 1966. However, the engine used in these Trans Ams was the same regular production 455 taken from the big body cars Pontiac was producing, and output 200 HP with a torque rating of 330lbft at 2,000 rpm.[13]. Manage Settings The V8 was phased out in 1981, replaced by GM "corporate engines" such as the Chevrolet 305 cu in small block V8. Power output ranged from 135hp (101kW) to 170hp (127kW). [4] It was replaced by the 455 for the 1970 model year. On the invoicing for the 1979 model year Firebirds, they had the option listed as L78, however, every 1979 400 equipped car received a W72 engine. Muscle Cars. From 1969 though 1970, the Ram Air IV was available in both A-Body (GTO, including Judge) and F-body (Firebird, including Trans Am) form. 301 4-barrel 'W72' or 'ESC' (170hp, 127kW) (with the 5th character of the VIN being a "W" for 1979-1980 and the 8th for 1981). Regarding Crower's upgrade suggestions for its camshaft, Jim pretty much has it covered. None of Pontiac's Ram Air engines actually enjoyed any true ram air effect. For 1974 another 1,001 (943 Trans Am, 58 Formula) were built, after which the SD-455 was discontinued. Angles used in valve job: 30-deg intake, 45-deg exhaust seat, width 0.040-in intake, 0.060-in exhaust The most famous S/D of them all. 1966: 421: 9782611 (late) 1967-1969. The 1981 rendition of this engine was officially called the 301-EC [EC standing for Electronic Controls] in the 1981 GM factory service manual, removing the need for a W72 option separately as it was now the standard motor, similar to how all W72 engines in 1979 were coded L78.[16]. In 1964 when the new "A" body intermediates came out there was a new corporate (GM) engine size limitation to anything less than 330cuin (5.4L). For the 1978 model year, Pontiac re-incorporated the earlier thicker cast cast engine block denoted by the cast number 418988 and a "XX" cast into the side of the block. Its cast "670" heads had taller valve spring heights than the standard D-port heads, and the only 14-degree valve angle closed combustion chamber making these heads unique. Pontiac V8 Engine Tune Up Specifications. This was the last run for the 455 (7.5 L) motor from Pontiac, and production ceased on the 455 this year as it could no longer meet the emissions requirements any longer. It was the same engine as the '67-'68 400 HO[18] but for 1969 and 1970 it included a driver-selectable outside air induction system on the GTO(it was a separate option on Firebird), with the hood vents opened and closed using a knob located under the dash, below and to the right of the steering wheel, its bracket labeled "RAM AIR".
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