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Part number: 278905-1
Product Details
SRP 278905-1 Professional Sport Compact Pistons - Individual Pistons
Products specifications
Bore 85mm
C/D 34.72mm
Comp Ratio 9.0:1
Dome CC -9.1
Gram Weight 317
Head CC 47
Oversize STD
Rod 150mm
Skirt Type Forged Side Relief
Stroke 88mm

SRP Professional Pistons include features used in professional racing such as lightweight forged side relief (FSR) forgings, high quality wrist pins, and precision CNC machined ring grooves and skirts. In addition, every package includes JE Pro Seal Premium Piston Rings. The included ring set features a 1.2 premium steel top ring, 1.5mm Napier (hooked face) second ring and 3.0mm standard tension oil ring. Every piston is designed and manufactured in the USA at the advanced JE/SRP Pistons manufacturing center.

SRP Professional piston designs were created using 3D computer modeling and tested for strength using Finite Element Analysis (FEA). Several revisions were made to optimize the strength and weight before manufacturing began. Unlike other piston manufacturers, JE/SRP Pistons manufacture billet pistons from solid pucks of aluminum for dyno testing in actual engines prior to approving the final forging designs.


  • Advanced, lightweight FSR forging that eliminates stress concentrations for superior strength
  • Up to 20% lighter than traditional equivalent
  • High-silicon 4032 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 applications

SRP Professional Pistons are sold INDIVIDUALLY for replacement or test fitting purposes.

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I ordered an exhaust setup (headers and a cat-back) late monday night, an it was shipped on wednesday. Thanks for a fast transaction Autoplicity!
Its was. Very easy thanks
Great price, and quick processing of my order. Will use again.
Is the part in stock or on back order
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