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In this mode damage could occur to the pistons, camshaft, or the lifters themselves. The resulting solution was a package of components that would replace the lifters, lifter guides, camshaft, Valve Lifter Oil Manifold (VLOM) plate. Cylinder heads were required to be removed from the engine in order to replace all the components.
It is Chevrolet's last production first-generation small-block. The cylinder heads feature combustion chambers and intake ports very similar to those of the LT1 V8, but lacking the LT1's reverse-flow cooling and higher compression. As such, the L31 head is compatible with all older small-blocks, and is a very popular upgrade.
Balsa wood was chosen for its stiffness, light weight, and sound absorption qualities. The all aluminium LS1 overhead valve engine is much lighter than its bi-metal (cast iron block, aluminum heads) predecessor, the LT1, and provides for a much lower hoodline when compared to an overhead cam design of relative displacement.
Differences from the LS1 included ported cylinder heads, larger throttle body, revised camshaft, remapped ECU, titanium valve spring retainers, upgraded valve springs and valves. The compression ratio was also lowered slightly to 9.95:1 and the engine ran MAFless. In HSV models, this engine was used with a higher than standard 3.91:1 final ...
A redesigned cylinder head and manifold for improved air flow. Variable exhaust valve timing (the LW2 engine only had variable intake valve timing) Specially-developed fuel injectors. New pistons with pentroof-style centre-domes and valve eyelets for a higher compression ratio of 12.2:1 (compared to 10.2:1 for the dual fuel engine).
Revisions to the engine for 1986 included roller lifters with a slightly smaller camshaft (.435"/.438" lift and 194°/210° duration at .050"), new heads with smaller, swirl-port intake runners, floating piston pins, and larger piston dishes for lower compression (8.0:1 v. 8.4:1). These changes increased torque to 250 lb⋅ft (340 N⋅m) but ...
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