What is the reason for/purpose/function of studs in the 1971 LS6 heads that extend down into the valley of the block? See picture that was taken back in the early 1980's.
Reason for studs in LS6 heads?
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Re: Reason for studs in LS6 heads?
The GM casting #3946074 cylinder heads have tappings for 4 extra cylinder head bolts/studs (2 per head). However, these positions were used only for ZL-1 aluminum block engines. These blocks had 4 bosses in the lifter valley. The bosses were drilled for the studs. Cast iron blocks did not have the bosses. Curiously, GM did specify these same studs, GM #3946079, for 1971 LS-6 applications. I have no idea why, though. As I say, cast iron blocks did not have the drilled bosses so the studs, as far as I can tell, would be quite superfluous.In Appreciation of John Hinckley- Top
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