420A What Pistons to use

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Thanks for the links that should be pretty easy now, very good write-ups. No I was very nice thats why I wrote an email I am not a guy for confrontation, figure I can say what I need in an email wihtout feeling to bad. Just stated that I ask if it was nessesary for fpr and that I wanted one but he said no and bc of this I had engine failure, the least he could have told me was that I should be careful rasing my boost since I cannot raise the fuel which he did not do. And that I would appreciate any help since I spend my lifesavings at his shop and if not I will find another one.