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MAHLE Small Block Chevy 383 Flattop Powerpak Pistons, 5.7 Inch Rods
MAHLE Small Block Chevy 383 Flattop Powerpak Pistons, 5.7 Inch Rods

MAHLE Small Block Chevy 383 Flattop Powerpak Pistons, 5.7 Inch Rods

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MAHLE Small Block Chevy 383 Flattop Powerpak Pistons, 5.7 Inch Rods
MAHLE Small Block Chevy 383 Flattop Powerpak Pistons, 5.7 Inch Rods
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Part # 50342505
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Important Messages:

  • This product is discontinued.
  • Get FREE shipping when your order includes this item and exceeds $99! Ground shipping only in the contiguous US.


Piston Material:
Forged Aluminum
Piston Style:
Flat Top w/ 2 valve reliefs
Piston Diameter:
Select Oversize to see
Connecting Rod Length:
Piston Ring Style:
Wrist Pin Diameter:
Piston Weight:
451 grams
Top Ring Material:
Ductile Iron
Second Ring Material:
Cast Iron
Top Ring Thickness:
1.5 mm
Second Ring Thickness:
1.5 mm
Oil Ring Thickness:
3.0 mm
Oil Ring Tension:
Standard Tension
Sold in Quantity:


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"


Power Pak 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
  • Deburred
  • High strength, light weight steel pins
  • Race proven round wire locks
  • Low drag ring pak
  • Light weight slipper kirt forgings


  • 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.

Some parts are not legal for use in California or other states with similar laws/regulations

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