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Chevy Big-Block V8
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Engine Assemblies |
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Generation V and VI Big Block GM's Mark IV big-block engine has its first significant revision since 1965. The new engine, designated the Generation V (referred to as "Gen V" in this catalog) has numerous improvements to make this big-block more liable under high performance conditions. The added improvements for 1996 Gen VI engines are all of the improvements of Gen V plus new 6-bolt aluminum front timing cover and provisions for roller camshafts, and new damper. Major changes are: One-piece rear main seal, removal of manual fuel pump box and its machining, on production engines, revised oil system with the main oil gallery has been relocated from the drivers side oil pan to the camshaft tunnel, both reducing the possibility of oil leaks and simplifying block machining, revised machining of the front of block, cast aluminum rocker covers with O-ring sealing, the balancer and flywheels are not interchangeable because of balance weights, rocker arm adjustments are now net lash (non-adjustable). Important Technical Note: Use of the adjustable Mark IV cylinder head is not recommended with the new "Gen V engine", except with Bow Tie racing blocks and all Gen VI with six-bolt composite front covers. Changes in the configuration of the "Gen V's" coolant transfer passages allows coolant to seep into the lifter valley when the Mark IV head is used. Mark IV camshafts, water pumps, intake manifold, distributor and clutch housings can be used with the new "Gen V" engines. "Gen VI" 454 crate engines and bare block P/N 12550307 are the only "Gen VI" blocks that have machined fuel pump boss. (See Crate Engine section for engine part numbers and descriptions.) |
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