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). It was implemented as further development of a cost-effective, more fuel efficient V8 derivative of the 301 V8 for the CAFE requirements. The new-for-1965 "Venturi" body shape and curved side glass were carried over with updates front and rear. (imp.) Dry weight ranged from 590 to 650 pounds (270 to 290kg), depending on displacement and year. Year. [19], Parts for Ram Air V engines are not readily available. Here is another number to ponder: 370 hp. Specifications listing with the performance factory . All Pontiac V8s from 1955 to 1959 were reverse cooled, known as the "gusher" cooling system. An HO version could be ordered in the GTO, as GM had lifted its restrictions on offering engines larger than 400cuin (6.6L) in mid-sized cars (resulting in the 454 (7.44) Chevrolet Chevelle, All GTOs built from 1964-66 were powered by a 389-cubic-inch V-8 with 10.75:1 compression. The valve size increased as well, to 2.11in (53.6mm) intake and 1.77in (45.0mm) exhaust valves on high-performance heads. It shared the 389's 3+34in (95.3mm) stroke, but its bore was 3.78in (96.0mm) for a displacement of 336.66cuin (5.5L). Engine displacement is a function of bore and stroke. 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. 1961 Pontiac Ventura Super Duty 421 Sport Coupe - RM Sotheby's A higher-output version was offered, called the 326 HO (High Output). Engine Oil: 95 ft-lbs. Still, it was the strongest American engine offered that year. At the end of 1976, Pontiac was no longer able to continue production of the 455 (7.5 L) V8 motor due to the tightening emissions requirements. First offered as an option in 1963, the 421 HO came in a 4-barrel engine of 320hp (239kW) and one Tri-Power H-O version with a hotter cam and efficient iron exhaust manifolds and rated at 370hp (276kW). Pontiac Engine Torque Specifications Chart - RodsShop Special Offer on Antivirus Software From HowStuffWorks and TotalAV Security. Brand: Crower PN 60311, solid The valve angle was reduced from 17 degrees to 14 degrees for better breathing. Installed position: 110-deg Dual Carter Carburetor 500cuft/min (14m3/min) #3433S (front) and #3435S (rear) carburetors with manual chokes and mechanical linkage. 1966 Pontiac Catalina . Pontiac V8 Cylinder Heads - Casting numbers and Specs - WOW Muscle Cars

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