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65Vart said
my little heads work good for the street. I have 10.5 /1 s. They work pretty good nothing wrong with them.

You must have better gasoline that we do here in SoCal. With 10.5 C/R it would be pinging like crazy.....then crack city. I've magged dozens of those 315 castings and it's rare to find one that isn't cracked.