JE Pistons 23º 350 & 400 F.S.R. HOLLOW DOME GP (GAS PORTED) New FSR version of our popular 23º domed pistons are ideal for circle track and drag racing. Up to 70 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.

Includes:

Accumulator Groove

Contact Reduction Grooves

Double Pin Oilers

Lateral gas ports

Pin #927-2250-15-51C (106g)

Wire Locks #927-073-MW

Compression Ratio:

58cc 14.8:1

64cc 13.5:1

76cc 11.5:1