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There were a few different versions of the LT1. All feature a cast iron block, with aluminum heads in the Y- and F-bodies, and cast iron heads in the B- and D-bodies. Corvette blocks had four-bolt main caps, while most other blocks were two-bolt main caps. Block castings remained the same between 2 and 4 bolt mains.
The block entered production in mid 1965 as the Mark IV 396 cu in (6.5 L) "Turbo-Jet," phasing out the first-generation W-series Big-Block. In its first year the 396 was available as the L78 option in Corvettes and full-sized ( Impala , Bel Air , Biscayne ) models, and as the L37 in the intermediate ( Chevelle ) model.
Racing-spec cam, high-flow aluminum heads (casting #s varied by model year) and some upgraded, competition-grade parts: 12.50:1 [b] 430 hp (321 kW) [c] 1969: 1969: ZL1: Aluminum block with open chamber "3946074" aluminum heads (the early Corvette RPO engine featured a closed chamber head); cam even "hotter" than L88's; upgraded parts similar to ...
All generation-2 small-block Olds V8s used the same stroke of 3.385 in (86 mm). The big-block engines initially used a forged crankshaft with a stroke of 3.975" for the 1965-1967 425 and 400 CID versions; starting in 1968, both the 400 cu in (6.6 L) and the 455 cu in (7.5 L) big blocks used a stroke of 4.25 in (108 mm), with crankshaft material ...
The LT-1 is a Chevrolet small-block engine produced by the Chevrolet division of General Motors between 1970 and 1972. It was available exclusively in the Corvette and Camaro and was produced in relatively small quantities. It is regarded today as one of the greatest of the Chevrolet small-blocks, an engine that has been in production since 1955.
The Chevrolet small-block engine refers to one of the several gasoline-powered vehicle engines manufactured by General Motors. These include: The first or second generation of non-LS Chevrolet small-block engines; The third, fourth, or fifth generation of LS-based GM engines; The Chevrolet Gemini small-block engine
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