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It offers the airflow of more expensive heads, at a much lower cost. It does, however, require a specific intake manifold (the L31 has four bolts per head attaching the intake manifold, as opposed to the "traditional" six bolts per head found on older Chevrolet small-blocks). Chevrolet's L31 was replaced by GM's LS-based 5.3L LM7 and 6.0L LQ4.
General Motors has produced three different engines called LT1: 1970–1972 LT-1 – Chevrolet Generation I Small-Block; 1992–1997 LT1 – GM Generation II Small-Block;
Its maximum performance ratings (as installed in 1996 Corvettes) were 300 hp (224 kW) and 340 lb⋅ft (461 N⋅m), well above the 275 net hp and 255 net hp ratings for the original LT-1 in 1971 and 1972, and the 300 ft lb (est) net torque for 1971 and 280 ft lb net for 1972, but well below the 1970 LT1 gross rating of 360 hp.
Vic Edelbrock founded the corporation in 1938 when his desire to increase the performance of his 1932 Ford Roadster led him to design a new intake manifold, [3] friends and fellow drivers soon wanted one as well. This transformed his repair garage into a parts manufacturing enterprise, making one-of-a-kind equipment for automobiles.
Other modifications such as a better flowing intake manifold and cylinder heads gave the LT1 a power output of 300 hp (224 kW; 304 PS). [30] [18] The second generation culminated in the LT4 small-block, which gained a minor power increase of 30 hp (22 kW; 30 PS). Other changes included a lighter valvetrain and strengthened crankshaft. [30]
1905–1914 Cadillac Model D side-valve (acquired as part of the founding of GM); 1906–1923 Oldsmobile Model S side-valve (acquired as part of the founding of GM); 1906–1911 Buick Model D inline-4 [10] (T-head design, the only non-OHV Buick engine ever made) [11]