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Mahle's PowerPak piston assemblies include forged pistons, piston rings, pins, and wire locks--all in one race-proven package. The pistons are hand-deburred and then coated with dry phosphate to protect against ring micro-welding and pin galling during initial startup. For additional performance, Mahle added its proprietary Grafal anti-friction coating to the piston skirts. Low drag rings, steel pins, and round wire locks complete the Mahle PowerPak package

Specs:

• Cubic Inch: 370
• Bore Size: 4.125
• Stroke: 3.622
• Rod 6.125

Compression Ratio:

• 70cc: 9.1

*Image shown is a representation, actual product may vary.