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The Mahle MS forged piston set for GM LS 427ci applications is an eight‑piston package specified for a 4.125in bore and 4.000in stroke. Pistons accept a 0.927in wrist pin, use a 6.125in rod and carry a -3.0cc crown to yield an estimated 12.2:1 compression ratio. Each piston weighs roughly 438 g and is made from 4032 alloy for matched rebuild consistency.
Mahle MS Piston Set GM LS 427ci 4.125in Bore 4in Stk 6.125in Rod .927 Pin -3cc 12.2 CR Set of 8
