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Mahle MS forged piston set for 403 cid Chevy small-block applications. These pistons fit a 4.135" bore with a 3.500" stroke and 6.125" connecting rod, use a 0.927" wrist pin and a roughly 9.0cc combustion volume yielding about a 13.1:1 compression ratio. Specified weight ~450g per piston. Intended for high-output rebuilds where exact dimensional match to these specs is required.
Mahle MS Piston Set Chevy SB 403ci 4.135in Bore 3.5/3.75 Stroke 6.125/6 Rod .927 HD Pin 9cc 13.9CR
