I got a set of comp cam rr's of a friend that needed money they are 1.75 ratio and I wasn't sure what length I should get. Here are the specs for my heads and cam anything helps. here is the part number on summits page 13755-kit
CAMSHAFT 204-218 DURATION............LIFT .550/.550
54.4CC COMB CHAMBER
INTAKE RUNNER 195CC
INTAKE VALVE DIAMETER 2 INCHES
EXHAUST VALVE DIAMETER 1.550 INCHES
INTAKE AND EXHAUST VALVE ANGLES 23 DEGREES
DIAMETER OF OUTER SPRING IS 1.320 IN
SPRINGS ARE SINGLE