I don't know if this has been asked yet but how fast do you go with trick flow 240's ?

yellow rose said

LOL...that’s a fact. The Stage VI heads left a bit to be desired after may hours of porting.

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I have a question about head gaskets my finished bore is 4.375 & I'm trying to get all the compression I can with my flat tops, is it safe to use a 4.380 bore cometic ?