The Mahle MS forged piston set for GM LS 383ci engines is a matched eight‑piston package sized for a 3.905in bore with a 4.000in stroke. Each piston accepts a 0.927in wrist pin and uses a 6.125in rod length with a -6.0cc crown to yield an approximate 10.8:1 compression ratio. Pistons weigh about 386 g and are produced in 4032 alloy for balanced rebuilding.
Mahle MS Piston Set GM LS 383ci 3.905in Bore 4in Stroke 6.125in Rod .927 Pin -6cc 10.8 CR Set of 8