SRP Pistons 139537 Forged High Compression Dome 4.280 Bore

SRP Professional pistons are the most advanced lightweight FSR forging that offers superior strength. SRP pistons are up to 20% lighter than traditional equivalent pistons. High-silicon 2618 aluminum alloy for reduced piston-to-wall clearance and quiet operation. Accumulator grooves for improved ring seal. Designed for normally aspirated or moderate forced induction nitrous engine applications. SRP professional pistons come standard with high-performance skirt coating and low drag performance piston rings.

Hollow dome design fits most open chamber GM, Dart, and Brodix Heads.

CNC machined domes with radiused valve reliefs provide optimum flame travel.

Forced pin oiler for increased wrist pin lubrication

Pin fitting and double sprio locks (#990-042-CS) included

CNC Machined ring grooves accept 1/16, 1/16, 3/16mm rings (Rings Sold Separately)

990-2930-15-51S wrist pins (150 grams) included

Fits tall deck, when used with .400 long rods.

Will not fit GM Signature series or Edelbrock cylinder heads: P/N# 60549, 60559, 61559, 60449, 60459, 61459, 60479, 60499

Compression Ratio:

112cc 13.8:1

118cc 12.9:1

124cc 12.1:1