1966 pontiac 421 engine specs

Pontiac first offered three two-barrel carburetors in 1957 and the Tri-power set up was an option on the GTO from 1964-66. 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. Pontiac Engine Torque Specifications. By comparison, the factory 421 H.O. The 421 badging was standard on the 2+2, the 421 H.O. 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. The 421 engine is available only with related heavy-duty driveline components. 1966 Pontiac 2+2 $64,995. 1975 Factory Service Manual lists the SD-455, but the SD-455 did not meet emissions for the 1975 model year and was canceled. like the earlier 1971-1972 motor, but it was not the same motor, and featured standard d-port heads with a very conservative camshaft. SELLER Glendale, Arizona 85305. Example: A128 = January 12, 19*8. 1965-75 Pontiac & Tempest engine tune-upspecifications including timing, dwell angle, and Spark Plug Gap, and firing order. Pre-Owned. 18 watchers The engine was available in all full-size Pontiacs. A 400 cubic inch ram air equipped V8, it was an option on the 1969-70 GTO and Firebird Formula. A higher-output version was offered, called the 326 HO (High Output). It was factory rated at 366hp at 5,400 RPM and 445lbs.ft. Displacement began at 287-cubic-inch (4.7L) and grew as large as 455-cubic-inch (7.5L) by 1970. For 1959 the V8's stroke was increased to 3+34in (95.3mm), raising displacement to 389cuin (6.4L). which was seen on the hood of the 1957 Daytona Grand National winning car driven by Cotton Owens. The results showed Pontiac that an L-head simply couldn't compete with an overhead valve engine. 1966: 421: 9782611 (late) 1967-1969. Brand: Crower PN 60311, solid Pistons: Icon PN IC892 application 428 +0.030-in with 10cc dish Learn how Classified Ads works . The W72 also featured a camshaft with a higher duration, finer tuned 800cfm Rochester Quadrajet, insulated fuel line, larger 60PSI oil pump, chrome valve covers, a larger harmonic balancer, and the "T/A 6.6" Shaker decal. This had extra-rich "DX" secondary metering rods and a remote vacuum source for the primary metering rod enrichment circuit to allow the Power Enrichment Vacuum Regulator (PEVR) to release the primary metering rods to move to the up position (enrichment) anytime during boosted conditions. Pontiac Heads; Pontiac Engine Torque Specs; Pontiac Cars (Body Types) Pontiac Engine Information; Instruction Sheets; Compression Calculator; Ask a Tech Question; Customer Service. The horsepower ratings of this era were often dubious, with engines rated higher or lower in output for advertising, political, or insurance purposes. This 356hp monster is backed by a 4-speed manual transmission, while the Pontiac also features power steering and power brakes. However, a few dealers would offer them in the GTO or Firebird and do their own installations, such as Royal Pontiac who offered the "Bobcat" conversion. The 1980 301 Turbo was rated at 210hp (157kW) at 4400rpm and 345lbft (468Nm) @ 2800rpm. Tri Power engine however was optional. An example of data being processed may be a unique identifier stored in a cookie. Pontiac's V8s share the same 6.625in (168.3mm) connecting rod length, with the exceptions of the later short deck 301, 265, and 303 Ram Air V. Most Pontiac V8s had an overall length (to the edge of the water pump pulley) of 28.25in (718mm), an overall width of 27in (690mm), and a height (not including air cleaner) of 31in (790mm). Standard motor was the 421 4 barrel with 342 horsepower, which was no slouch itself. It was offered in the following forms: For 1957 the V8's stroke was increased to 3.5625in (90.49mm), for a displacement of 347cuin (5.7L). In 1967, the Pontiac 2+2 became an option on the . Royal Pontiac developed the prototype of the package on their 1965 GTO drag car and Pontiac picked up the idea and in August 1965 Pontiac offered the new Fresh Air package to dealers consisting of the parts and instructions needed to make the hood scoop functional, including the metal tub to mount to the carburetors and rubber gasket to seal it to the underside of the hood. 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. On this Wikipedia the language links are at the top of the page across from the article title. Sponsored Stories . In 1969 the 350 HO was upgraded again with the addition of the 400 HO cam, commonly referred to by enthusiasts as the 068 cam. These motors were built mainly for NASCAR or other racing purposes and were equipped with all the extra racing goodies that people were looking for. The manuals had Hurst shifters. Beginning in 1967 casting numbers moved to the rear of the block just behind cylinder #8. For 1967, Pontiac retired the 389cuin (6.4L) and replaced it with the 400cuin (6,554cc), a 389 bored-out by +0.06in (1.5mm) to a bore and stroke of 4.12in 3+34in (104.6mm 95.3mm). In 1969, Pontiac unveiled its Trans Am model Firebird, and since racing rules required engines of less than 5L (305.1cuin), Pontiac unveiled the 303 for racing models only, never available to the public. - P.Top - Correct Exterior/Interior. Based on the same short-deck as the 301, the "LS5" 265.1cuin (4.3L) was offered only in 1980 and 1981. for 1980, and the 8th being a "T" for 1981). As Pontiac's 1967 performance brochure said, "You can add the Ram Air induction hood scoop and new high output cam and valve springs to the Quadra-Power 400 for better top end breathing." The Ram Air IV replaced the Ram Air II in 1969. . Deck Height: 10.215-in 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. This 1966 Pontiac 2+2 Convertible is a beautifully restored big-block convertible that is ready for some boulevard cruising! ][citation needed] T, While the exact total number of Ram Air V engines produced is not positively known, only about 25 303cuin (5.0L) engines were produced and about a dozen 428s and 366s. 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. The engines feature a cast-iron block and head and two valves per cylinder. 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. Bore/Stroke ratio: 1.04:1 . ft. After the SD-455 was certified with the new cam, it was production-ready but was then further delayed by the EPA mandating Pontiac recertify all of its engines when the EPA discovered that part-throttle emissions exceeded the limits. Read. Compression jumped from 11.0:1 to 12.0:1, while other tweaks increased maximum shift points by 500 rpm, to a screaming 6400 rpm. Often called the "Ram Air III", this engine was officially called the "400 Ram Air" for 1969 and then simply "Ram Air" for the 1970 model year. Two tri-power 421s were optional, one with 356 bhp, the other with 376. Pontiac first offered the 2+2 as a Catalina engine, suspension, and trim group in 1964. Pontiac planned to produce the 1953 models with the V8, but Buick and Oldsmobile appealed to GM management and earned a 2-year delay. All 196869 #9792506 Ram Air 400 blocks have 4-bolt caps. It produced 120hp (89kW) After 1981, the Pontiac V8 was replaced entirely by the GM "corporate" V8's from Chevrolet and Oldsmobile. Both Randy and Stan were aware of the . Lift: 0.515/0.525 with 1.6:1 rockers The premier SD 421 cylinder head was the late 1962-early 1963 casting #9771980 aka "980", featuring a larger 11.3cuin (185cc) intake port volume, flowing 230cuft/min (6.5m3/min) @ 28in (710mm). 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]. Optional engines included the 356hp Tri-Power as seen on our feature car (code WH manual or YJ auto), or the 421HO, rated at 376hp . Engine Oil: 120 ft-lbs. Like the 326, it was offered in both 2-barrel and 4-barrel versions. Fuel line size: 38-inch, 516-inch to carburetor The inlets were all well within the boundary layer that exists close to the surface, so all of these systems would more accurately be described as "outside air induction" systems, benefiting from the intake of cooler, and thus denser, outside air versus the comparatively hotter and less dense air under the car's hood. Exhaust: 180 cfm at 0.500-in Pontiac continued using its round-port cylinder-head design for 1971-'72 on the 455 HO. Using an equation the author has provided in HPP many timesmost recently with The Mule engine seriesit was revealed that around 228.6-cfm flow though the intake port of the cylinder head is required to produce the desired 470 hp. These guys lived by mathematics since every function of an engine that converts chemical to mechanical energy can be assigned a number. 1967 - 400 Ram Air Code 97. The Ram Air IV used the Ram Air II's camshaft but lift in the Ram Air IV was increased to 0.52in (13mm) thanks to the use of 1.65 ratio rocker arms (vs 1.50). Unusual for a major automaker, Pontiac did not have the customary "small-block" and "big-block" engine families common to other GM divisions, Ford, and Chrysler. This S/D retains the original "Traction Master" traction bars and two-bar spinners on the original 8 . The 1981 301 Turbo gained the electronic controls with an O2 sensor, feedback ECM and E4ME Quadrajet providing a slight reduction in output to 205hp (153kW) and 340lbft (461Nm).The 301 Turbo was limited to Trans Am and Formula Firebird production only. Again, its bore was expanded, this time 0.03in (0.76mm) to 4.1525in (105.47mm). 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). Year: CU IN: Casting # 1967: 326. Most Pontiac engines like total timing (rev engine past 3000 or so until the mechanical advance stops moving/advancing, vacuum advance disconnected to check total timing) somewhere between 32 and 36 degrees. Continue with Recommended Cookies. All Pontiac V8s from 1955 to 1959 were reverse cooled, known as the "gusher" cooling system. Pontiac first offered the 2+2 as a Catalina engine, suspension, and trim group in 1964. By early 1979, orders for the W72 package were being rejected by dealers as they supply had run dry. It shared the 4.121in (104.7mm) bore of the 400, but with a 2.84in (72.1mm) stroke for a displacement of 303cuin (5.0L). In 1973 a further refined and even stronger but less powerful version, the Super Duty (SD) engine, was planned for Firebird, Grand Am, Le Mans (GTO), and Grand Prix models. Seat pressure: 110 pounds at 1.600-in 1963 Pontiac V8 Engine Specs. 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. A new engine was fast-tracked, its relatively late start allowing it to take advantage of developments proven in the Oldsmobile V8 and Cadillac V8. 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 engine came with 543797 (4-barrel) and 9770716 heads for the tri-power and special exhaust manifolds and a 7H cam with 292deg. It was called the Ram Air IV due to the planned use of four air inlets. More 400cuin (6.6L) engines were produced by Pontiac than the other versions - estimates range from 80 to 200 units. Compression Ratio: 10.6:1 effective The overhead-cam six-cylinder engine was new for 1966 and the standard engine in the Tempest and Tempest Custom. Beginning in 1961 the Pontiac V-8 (389 and 421) was dubbed the Trophy V-8, due to its many victories in racing. 1965 Pontiac LeMans GTO Mecum. The Block Date Code represents the production date of the engine. 1969 - 400 Ram Air III Code 62. Two four-barrel carburetors, 10.5:1 compression, 285hp (213kW) @ 5100rpm, 330lbft (447Nm) @ 2600rpm. He says the Tri-Power setup modified with the addition of the larger '66 center carb will flow 1,050 cfm. The V8 engine was introduced for the 1955 model year as the "Strato Streak". As Stock drag racing heated up at the dawn of the Sixties, the factories were serving up a constant stream of engines, transmissions and lightweight body par. [19] The cylinder head design is similar to the Ford FE tunnel-port head used in the GT40 and Can-Am series racing. The Pontiac 301 EC (Electronic Controls) version offered in 1981 produced 155hp (116kW) and 245lbft (332Nm), although it's rumoured that the actual output was closer to 170hp (127kW). Instead, they were substituted with the L80 Oldsmobile 403, or the L37 Pontiac 301 if they still requested a 4-speed transmission. They came up with a 269-cubic-inch (4.4L) L-head design.

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