There's plenty of info about the advantages and gains of fitting 1.5 ratio roller rockers, but what are the disadvantages, or rather when would a 1.3 roller rocker set be preferred over the higher lift 1.5 set?
I'm in the process of assembling all the bits to fit a big valve head (36/30) to my '98 JDM (MPi/SPi) and currently thinking lightweight flywheel, LCB and RC40 system but retaining the MPi cam. I'm looking for good mid-range torque rather than ultimate high-revving power because it's a road car, not planning to track it. Would the 1.3 offer any benefit in torque?