- The Mahle PowerPak was designed as a completely finished drop in piston assembly. Other then filling the included performance ring set, everything is done for you. Designed from 80+ years of piston manufacturing for everything from OEM to Formula1, only the best technology is used to make these pistons. They are forged from 4032 or 2618 aluminum alloys to suite specific needs for strength and durability. Forced Pin Oiling is used for increased wrist pin lubrication. Pin bores are CNC precision machined. .927" High Quality Steel Wrist Pin (118g), Performance 1.5, 1.5, 3.0mm rings, and Race Proven Round Wire Locks are included.
Compression Ratio with 64cc Heads 8.9
SKU SBC550040I20 Manufacturer Mahle Vehicle Make Chevy SB Bore Size 4.040 Wrist Pin Size 0.927 Piston Material 4032 Forged Aluminum Compression Height 1.550 Piston Ring Size 1.5 1.5 3.0mm Piston Type Inverted Dome -20cc Rod Length 5.700 Crankshaft Stroke 3.480/3.500 List price No