These Mahle PowerPak Piston, Pin and Rings Packages are Standard Equipment in our Street Chief Series Injuns.

488 Cubic Inch 4.155 Bore. 4.500 Stroke. 6.800 Rod. 1.160 Compression Height. .990 Pin. -6.4cc Valve Reliefs. 506 Gram Weight. 4032 Alloy. Compression Ratios with various Combustion Chamber CCs: 12.5 w/72cc    11.5 w/80cc    11.1 w/84cc

PowerPak Features Include:

• Forged piston for performance applications
• Fully-machined crown
• Grafal® anti-Friction coating on skirts*
• Phosphate-coated to reduce micro-welding and pin galling**
• Pin bores finished on CNC boring equipment
• Hand deburred
• High strength, light weight German steel pins
• Race-proven round wire locks
• Low drag file fit piston ring pack 1.0, 1.0, 2.0mm 
• Light weight slipper skirt forgings

* MAHLE’s GRAFAL® skirt coating reduces drag, scuffing, friction and cylinder bore wear; reduces piston noise.

** Phosphate coating provides the grey appearance to the MAHLE piston. This dry lubricant coating (not to be confused with a thermal film coating) provides a lubricant film in the pin bores and ring grooves until the oiling system of the engine reaches operating pressure; particularly useful during the initial start-up or break-in of engines to protect against galling and microwelding. The piston crown is still machineable.

4032 is a high-silicon, low-expansion alloy. Pistons made from this alloy can be installed with tighter piston to bore clearance, resulting in a tighter seal with less noise. 4032 is a more stable alloy, so it will retain characteristics such as ring groove integrity, for longer life cycle applications. Relative to 2618, 4032 is a less ductile alloy, making it less forgiving when used with boosted and/or nitrous applications.