2.5cc flat top
Comp ratio 10.0:1
Bore size 3.630”
Rod length 5.933”
Stroke 3.650”
Comp distance 1.165”
Pin size 2.500” long / .150”wall
Ring grooves 1.2mm top 1.2mm centre 3.0mm bottom
Piston clearance .003” measured 0.850” from of the oil ring
Premium 9130 alloy