I ran them on with the stock pistons for over a year without any problems. After the heads were surfaced then the valves started hitting at least 2 pistons. I have since taken them off until I can build a motor for them.
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92GT KB Ram Air, C&L 76mm MAS, 70mm TB, KB(Blowzilla) 8psi, E-Cam, Headers,Stock Cats, Borla mufflers,3.73's
"Dont Do Drugs-You Might Buy An Import"
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