Big Block Chevy forced induction forged piston set Flat Top Bore 4.500 ; Stroke 4.250 ; Rod Length 6.385 ; Wrist Pin Size 990 x 2.930 Ring Grooves 1/16 1/16 3/16 C.H. 1.270 Weight 609 grams; For use in turbo charged or supercharged engines. Ross Racing Pistons 85069
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