I used Diamond pistons and Manley valves in my 427. The pistons were custom ordered and a little pricy, but they may have cheaper off the shelf pistons for your application. I think I used the Severe Duty valves. 7300 RPMs and no problems yet.
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Freddie
1969 Camaro RS/SS396 (427) 4 speed
Last edited by big gear head; 07-03-2021 at 03:27 PM.
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