Different 312 main bearing caps


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By 46yblock - 15 Years Ago
I have 5 main caps taken from a 312.  Lined them up on a table today and noticed one had bolt holes that were at least 1/4 in. shorter than the other 4.  Numbers on 4 are ECZ 6329A, and on the oddball ECZ6325A.  The short cap came from the rear of block.  Dont recall reading that there were 2 styles of 312 caps.  Did the '57 312s have the shorter bolts?
By aussiebill - 15 Years Ago
46yblock (4/3/2010)
I have 5 main caps taken from a 312.  Lined them up on a table today and noticed one had bolt holes that were at least 1/4 in. shorter than the other 4.  Numbers on 4 are ECZ 6329A, and on the oddball ECZ6325A.  The short cap came from the rear of block.  Dont recall reading that there were 2 styles of 312 caps.  Did the '57 312s have the shorter bolts?

Short one is rear one to clear rear seal housing lip.

By 46yblock - 15 Years Ago
Thankyou Bill.  These are the only ECZs I've ever seen.