/ 8.3 mpg (U.S.) / 3.5 km/l, more data: 1966 Pontiac Bonneville Convertible . SELLER Glendale, Arizona 85305. Example: A128 = January 12, 19*8. The 421.19cuin (6.9L) was introduced in 1961 as a dealer-installed Super Duty option. Stock Pontiac Head Specs * During my searching for information, I found quite a few discrepancies in the sources I was viewing. Pontiac engines were used in its U.S.-market cars; Canadian-built Pontiac automobiles generally used Chevrolet engines. Free-flowing exhaust manifolds from the 400 Ram Air were used late in the model year. The standard head seen on an L78 400 Pontiac was the low compression 6x8 head, while the 6x4 head seen on the W72 had hardened valve seats for a higher RPM operating range, improved air flow, and higher compression. engine, dual exhausts, three-speed manual transmission, Hurst shifter, 3.42:1 rear gears, heavy-duty suspension, bucket seats, upgraded upholstery, carpet, emblems, "Decor" louvers, pinstripes, lower . Intake: 218 cfm at 0.500-in These guys lived by mathematics since every function of an engine that converts chemical to mechanical energy can be assigned a number. The 1971 455 HO was available in the Firebird (optional in Formula; standard in Trans Am), the GTO (standard with "The Judge" package), and the 2-door LeMans, LeMans T-37 (including GT-37), and LeMans Sport. 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. 1968 - 400 Ram Air I and 428HO Code 37" Ram Air I and. Secondary: Front and rear #70 With a view to the latter, what we find lurking under the hood is the 421ci Tri-Power V8. The L75 455 engine continued as an option into the 1976 model year for the Trans Am, however, Pontiac opted to drop the "H.O." 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). For 1974 another 1,001 (943 Trans Am, 58 Formula) were built, after which the SD-455 was discontinued. 744) and a new valve spring package with dampers to positively control valve action. Pontiac 421 Tribute to the legendary muscle car engine Specifications listing with the performance factory . 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. 1966 Pontiac Catalina . The 670 heads were used until May 1967 when they were upgraded to become the "97" heads, which were then replaced late in the model year by the "997" heads which incorporated the upgrades of the "97" heads. 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. In 1969, Pontiac also used a revised crankshaft out of a Pearlitic malleable-iron, although it still used the "N" casting letter. Horsepower: See Part 2 Beginning in 1961 the Pontiac V-8 (389 and 421) was dubbed the Trophy V-8, due to its many victories in racing. Final torque ratings may vary and need to be determined based on application and parts used. Block description: '64 421ci #157 However, in the June 1974 issue of SUPER STOCK AND DRAG ILLUSTRATED, a new 1974 Trans Am with the SD-455 motor ran 14.25 @ 101mph (163km/h). True Pontiac engines were designed and built in Detroitnot on a computer, but often by GI-bill-educated engineers who grew up working with their hands and now had a slide rule in their pocket instead of a greasy rag. 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. Rod bolts or studs/head bolts or studs: ARP cap screw supplied in Howard's rods / PMDOILING SYSTEM The SD-455 used round-port cylinder heads similar to those used on the 1971 and 1972 455 HO, with specific "LS-2" intake and cast-iron exhaust header manifolds. Read. 1965 Pontiac Grand Prix with a 421 Tri-Power engine - YouTube Pontiac 2+2 - Wikipedia [citation needed]. The Pontiac 421 HO was the king of the streets in 1963, producing 353 and 370 horsepower depending on carburetor configuration. 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. Greater throughput mixed with the proper amount of fuel and ignited at the ideal time for the flame to expand against the piston will result in more power. 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. The 455 HO moniker was again carried over, this time as a near-exact repeat of the 1971 offering, the only changes were the carburetors (they used a conventional 750cuft/min (21m3/min) unit this year), and the head castings (casting #7F6). 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). Also, a rumored 75 cars were built with non-Super Duty 421 engines rated at 320 bhp. An example of data being processed may be a unique identifier stored in a cookie. Pontiac Heads; Pontiac Engine Torque Specs; Pontiac Cars (Body Types) Pontiac Engine Information; Instruction Sheets; Compression Calculator; Ask a Tech Question; Customer Service. It was rated at 475hp (354kW). 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. This 1966 Pontiac 2+2 Convertible is a beautifully restored big-block convertible that is ready for some boulevard cruising! Retainers: Crower steel 1966 Pontiac Catalina 421 H.O. Gives New Meaning to the Term 'Full Floater' This 356hp monster is backed by a 4-speed manual transmission, while the Pontiac also features power steering and power brakes. The 301 had a bore and stroke of 4in 3in (101.6mm 76.2mm). Pontiac began as a "companion make" to the Oakland division of the General Motors line of automobiles in 1926. 5 January 2007. Torque: See Part 2 Pontiac did not release official power ratings for this engine, saying only that it had more than 300hp (224kW). Piston-to-deck height: 0.009-in 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. The 1966 Pontiac GTO was also the first car to replace the aluminum grille with plastic mesh-pattern inserts. 1966 Engine Codes ; Code: Application: Displacement: Compression: Horsepower: Transmission: Heads: Camshaft: Carb: WA : 389: 8.6:1: 256: Manual: 91: 254: 2 bbl: WB . Some 400s were dealer installed. The camshaft was also revised to have a slightly higher duration, the carburettor jets tuned and a dual exhaust was implemented allowing the power to increase to 220hp (223PS; 164kW) at 4000 rpm and 320lbft (434Nm) of torque at 2800 rpm. [19] The cylinder head design is similar to the Ford FE tunnel-port head used in the GT40 and Can-Am series racing. All 428 cylinder heads received the 14 degree valve angle, closed chamber only in 67 and open chamber 68 and up. of torque at 3,600 RPM in the Firebird, with only a small throttle restrictor tab on the Firebird being different. All GTOs built from 1964-66 were powered by a 389-cubic-inch V-8 with 10.75:1 compression. Regarding Crower's upgrade suggestions for its . 1965-75 Pontiac & Tempest engine tune-upspecifications including timing, dwell angle, and Spark Plug Gap, and firing order. . Pontiac engine production records report that 190 XS-code 389 engines were built during the 1966 model year. A 400 cubic inch ram air equipped V8, it was an option on the 1969-70 GTO and Firebird Formula. Pistons: Icon PN IC892 application 428 +0.030-in with 10cc dish It was rated at 310hp (231kW) @ 4800rpm and 400lbft (542Nm) @ 3,000rpm on 10.5:1 compression. Fuel pump: Will use 110-gph Carter The crankshafts were also unique in the fact that they featured only two counter weights instead of the usual five and also featured lightened connecting rod journals. A limited-slip differential and gearing up to 4:11.1 were optional. The 301.6cuin (4.9L) 301 was offered from 1977 to 1981 and also installed in other GM cars during those years. 1966 Pontiac 2+2 for sale near Rogers, Minnesota 55374 - Classics on 4/21: Not just a date, but a legendary 421-cid Pontiac engine that What was most interesting about the 421 engine in the beginning was that it was a dealer installed option only known as the SD (Super Duty) 421. None of Pontiac's Ram Air engines actually enjoyed any true ram air effect. The 1975 455 HO package received some negative press/reviews as some buyers expected to see a return of the 1971-1972 engine, and were disappointed when they received the lower output motor. 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. of torque at 3,800 RPM in the GTO, and 340 HORSEPOWER at 5,300 RPM and 430-lb.ft. Pontiac . Chamber: Closed, special to PMD, 70 cc Math, not gasoline, makes horsepower under the hood of a Pontiac. 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). Not where most enthusiasts go first. Lifters: Crower solid with EDM oil hole (0.024 inch) 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. Not long before the model year introduction, Pontiac management decided that the entire line would be V8-powered. The base engine was the 421 four-barrel with 338 horsepower. Initial advance: 18-deg From 1977 to 1981 there were 4 distinct 301 versions: For 1981 model year vehicles, the engine codes are the 8th digit of the VIN. For those who may not be familiar with the equation, here it is again: In addition, a shallower spherical-wedge combustion chamber moved the tuliped valve heads .040" closer to the piston at TDC, improving mixture draw considerably during the intake stroke. 1965 Pontiac Bonneville Convertible | Hemmings . The 421 Super Duty had been the first of these, and their large bore and stoke made them popular in NHRA and NASCAR competition throughout the '60s. Valvesprings: Crower, dual no damper The horsepower ratings of this era were often dubious, with engines rated higher or lower in output for advertising, political, or insurance purposes. 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). V-8 (coded WG for stick or YH for auto) was the 2+2's base engine. Installed position: 110-deg For 1965, however, the 2+2 became a bonafide muscle car. It was rated at 376bhp in 1967 and 390bhp in 1968 and 1969. Pontiac V8 engine - Wikipedia A higher-output version was offered, called the 326 HO (High Output). Here is another number to ponder: 370 hp. or choose Generic to see kits that might fit a . The V8 engine was introduced for the 1955 model year as the "Strato Streak". Turn adjusting screw in Clockwise until engine misfires, then turn screw out 1/2 turn . In 1968, a 320hp (239kW) HO option was offered in the Tempest and Firebird. 1966 Pontiac Grand Prix - conceptcarz.com