My 391C (original owner had flat top Probes pistons and closed chamber which raised compression to 11.5 to 1)
I waited for the right opportunity and purchased open chamber 4V heads with SS valves, adjustable valve train hardware and fresh valve job and brought comp. down well over 1 point for more streetability. My next motor which I'm currently putting together is a 4 bolt block that cleaned up and honed at 4.017 and Diamond piston will gladly custom build my dished pistons for a streetable 10.5 comp. with closed chamber heads and a .14 cc dish.
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