ed;;;;here is all informance on piston card that came with pistons.
job#1347A
bore--4.500 com height-----1.520 stroke-----4.250
rod length--6.135 effective volume--- -3.0cc
top ring; 1/16 2nd. ring; 1/16 oil ring; 3/16 support rail;#none
wrist pin dia.; .990 wrist pin length; 2.930
lock ring part#01-5105 single .073 spirolox
piston weight 626 material type; 2618