JE Pistons new F.S.R. hollow dome GP (Gas Ported) pistons are specifically designed for circle track and drag racing applications. Up to 100 grams lighter than traditional full round (including wrist pin and rings), but stronger and more durable due to modern FEA-designed forging. Deeper valve pockets to accommodate higher lift cams and milled cylinder heads. Accepts low friction .043/.043/3.0mm ring package. Dome configuration designed to accommodate most popular open chamber cylinder heads, including Brodix Head Hunter with up to 2.400? diameter intake valves.

Includes:

Pin #990-2500-18-51C (151g)

Wire Locks 990-073-MW

Lateral gas ports

Accumulator grooves

Contact reduction grooves

Compression Ratio:

110cc 17.2:1

118cc 15.8:1

124cc 14.8:1