Mahle MS forged piston set for SBC 315ci specifies a 3.796in bore, 3.480in stroke and 5.700in rod across eight pistons. The extended data lists a 1.550cc crown height, 0.927in wrist pin, -1.6cc dish volume and an indicated 9.9:1 compression ratio with an estimated piston mass near 421g. Use this set when those bore, stroke and volume figures match your 315cid SBC build requirements.
Mahle MS Piston Set SBC 315ci 3.796in Bore 3.480in Stroke 5.700in Rod .927 Pin -1cc 9.9 CR Set of 8