Quote:
Originally Posted by dmsfrr
If you look closely at the bolt holes to the head you'll see that all but one hole is larger than the bolt diameter. Pretty sure this is to allow the manifold to expand and contract as it heats & cools, helping to take stress off so it's less likely to crack. Another reason the bolts shouldn't be over tightened.
Be aware there are several different styles and their diameter increased for '57.
http://www.y-block.info/casting/exhaust.html
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I checked the link for the exh. manifolds. 1960's are listed as C2AZ both L&R. How could that be as C2 is 1962. Couldn't have part numbers 2 yrs ahead of production