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Strength through forging is the big deal with the Boss 302 piston at left. Compared to the hypereu-tectic Coyote piston at right, the Boss piston is mechanically much stronger so it can withstand the Boss’s higher pressures and rpm stresses without the Coyote piston squirters. The other Boss piston detail difference is the valve reliefs—they accommodate the RoadRunner’s larger exhaust valve. Also upgraded is the top piston ring, which has a spray plasma inlay unique to the Boss’s increased scuff and durability needs.