Boring Flat Head V8 block .060
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Join Date: Dec 2003
Location: Saskatoon, Saskatchewan
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.60 or .80 is just getting started on a late series (48-53) flathead V8. These castings are regularly bored a common .125 to reach 3 5/16" bore. Often they have no trouble going to 3 3/8" which is a whopping .250 over. Back in the day, more than a few guys even found blocks that would open up to 3 7/16".
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Hold the presses - my math was off. 3 3/8" is .188 over, not .250 - sorry about that! Stock bore is 3 3/16"
Biggest problem with the larger bores is keeping them from running hot. You just need to keep wall thickness at least .100"
I honestly haven't heard on anyone cracking a block in the past 8 years I've been messing with flatheads. Someone on msn suggested once that they believed that all the cracks in the flatheads happened as the cores were stabilizing and settling out. If they crack as easily as we hear, you'd think it would be happening every day. There's a lot of guys driving these daily. FWIW
Biggest problem with the larger bores is keeping them from running hot. You just need to keep wall thickness at least .100"
I honestly haven't heard on anyone cracking a block in the past 8 years I've been messing with flatheads. Someone on msn suggested once that they believed that all the cracks in the flatheads happened as the cores were stabilizing and settling out. If they crack as easily as we hear, you'd think it would be happening every day. There's a lot of guys driving these daily. FWIW
Last edited by mtflat; 03-24-2007 at 01:23 AM.
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