Designed specifically for high boost blown alcohol drag racing. Valve reliefs accept oversized valves and are compatible with angle milled heads. Precision CNC machined ring grooves accept .017 Dykes, 1/16 second and 3/16 oil rings. Fits open chamber cylinder heads. 0.200? wall thickness Tool Steel pins included. May be used with buttons (sold separately) in place of spiro locks. Pistons will yield .020? deck clearance at listed block height.

Includes:

Pin #990-2930-20-52S (186g)

Double spiro locks (#990-042-CS)

Double pin oilers

Accumulator Grooves

Compression Ratio:

110cc 11.6:1

118cc 10.9:1

124cc 10:4:1