Special heavy nitrous design forged BBC dome piston set for use in a 4.320 inch bore; 4.250 in. Stroke; 6.385 Rod Length; .990 pin; 24.7cc Dome; 1.275 CH; Dome Height .225 in.; piston weight is 589 grams; Compression is 10-1 with 124cc chamber; 10.5-1 with 118cc chamber; 11.4-1 with 109cc. Ring Grooves 1/16 1/16 3/16. Set includes 8 forged pistons, 8 piston pins, oil ring support rails and set of pin retention lock rings. Ross 86070
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