Mahle Pistons 930247840 Forged Inverted Dome 4.040 Bore

Mahle pistons were designed as a completely finished drop in forged piston assembly. Other than filling the included performance piston ring set, everything is done for you. Mahle has over 80 plus years of piston manufacturing making pistons from OEM to formula 1 racing. Mahle uses only the best technology to make these pistons. Mahle pistons come standard with anti-friction skirt coating for reduced drag. Forged from 2618 low expansion aluminum alloy for high strength and reduced piston to wall clearance. Forced Pin Oiler is used for increased wrist pin lubrication. Pin bores are CNC precision-machined. .927" High-Quality Steel Wrist Pin 112g, Performance 1.0, 1.0, 2.0mm file-fit performance ring set, and Race Proven Round Wire Locks are included.

Compression Ratio with 70cc Heads 8.6:1.
Note: Oil rail supports included.