Product Summary

350, 383, Forged Aluminum Piston Material, 3.75" Stroke

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    The Mahle PowerPak pistons are a race proven lightweight forged design that are complete with rings, wrist pins and locks.  They are also completely phosphate coated plus feature an anti-friction Grafal skirt coating.  PowerPak pistons are made from 4032 aluminum alloy to allow for tighter cylinder to wall clearances, and improved temperature stability.

    1.5mm, 1.5mm, 3.0mm file fit performance ring set is included. For 383 c.i. S/B Chevy (4.000" bore x 3.75" stroke). Choose oversize diameter needed.

    1. Mahles phosphate coating provides the grey appearance to the 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.
    2. Mahle’s GRAFAL skirt coating reduces drag, scuffing, friction and cylinder bore wear; reduces piston noise.

    PowerPak Piston Chart (GIF)

    Item Details

    C/R 58cc=12.0, 64cc=11.3, 70cc=10.4
    Piston Weight: 451 g
    Rod Length: 5.7"


    • Comp Height 5.7" Rod:  1.425
    • Comp Height 6.0" Rod:  1.125
    • Pin Diameter:  0.927
    • Clearance Guide
      • *Meas. = 0.500
      • Min = 0.0025
      • Max = 0.0033

    *The location to measure piston-to-wall clearance for each application. This point is calculated from the bottom of the piston skirt and indicates the widest part of the piston and thus where to measure.


    Piston StyleFlat Top w/ 2 valve reliefs
    Piston MaterialForged Aluminum
    Piston Diameter
    Connecting Rod Length5.700"
    Piston Weight451 grams
    Piston Ring StyleE
    Wrist Pin Diameter0.9270"
    Top Ring MaterialDuctile Iron
    Second Ring MaterialCast Iron
    Top Ring Thickness1.5 mm
    Second Ring Thickness1.5 mm
    Oil Ring Thickness3.0 mm
    Oil Ring TensionStandard Tension
    Sold in QuantitySet