Dedicated to the Promotion and Preservation of American Muscle Cars, Dealer built Supercars and COPO cars. |
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#8
12-21-2008, 05:38 PM
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Re: 67 ZL1 ?
[ QUOTE ]
What are those marks on the deck above #3 and #7? [/ QUOTE ] Notice those cylinders are the ones where the "extra" head bolt(s) were intended to go (no provisions for bolts in those locations on a standard pass. car block, they were added for race applications--note the bosses in the lifter valley where the fasteners would go into the bottom of the head) Since this was a very common location for a head gasket to let go if the "extra" head bolts weren't used, some racers dimpled the deck here in an attempt to give the head gasket something to bite into to prevent them from blowing out. 
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