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Old 03-15-2007, 08:59 PM
derbyguy583 derbyguy583 is offline
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Chevy Head Casting numbers need help identifying

Hey guy's I have a set of heads I want to have redone and put on My Demo derby Motor I need help figuring out if they are a matched set and what size valves they have in them.Any help would be greatly appreciated. The numbers off of them are Left Side 3973487 also C101 & GM27. Right Side 3973487X also A132 & GM27 Once again any help would be appreciated thanks. Jacob
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