JE Pistons have been improved for 2009 to provide additional strength in critical areas with no increase in weight. Ideal for Sprint Cars or Dirt Late Models, the deeper valve reliefs (.320? int, .260? exh) now accommodate bigger cams and smaller chambers. Precision CNC-machined ring grooves now accept 1.2, 1.5, 3.0mm rings for reduced friction, while Lateral Gas Ports have been added for improved ring seal. Pin upgrade to 927-2750-17-93S recommended for applications over 700HP. This new configuration outperforms the competition hands down!

Includes:

Pin #927-2750-15-51S (130g)

Lateral Gas Ports with Accumulator Grooves

Double spiro locks (#927-042-CS)

Double pin oilers

Compression Ratio:

40cc 16.5:1

45cc 15.2:1

50cc 14.1:1