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Ok, so for us not porter guys. Maybe this is a real dumb question, but what area becomes brittle? How much are you hogging out to cause them to crack?

I too would be interested in seeing Dwayne, look at them to see what his thoughtare on these heads.
mike



I think you're right, Dwayne would be willing to test them.

We did a set of brand X heads a while back, handed them to a builder, told him these don't get passed around, try them on his engine. Wasn't long and an employee was flow testing them on their bench and trying to duplicate them. The little worker bee even asked us what to do because his heads looked just like ours and yet he was 30 cfm behind.