How much better is a gear drive going to be for accurate cam timing compared to a good true roller duplex replacement and what are the differences in the gear drives (ie) idlers etc.
Are the advantages of needle roller bearinged camshafts worth the effort, as a steel camshaft has to be machined and induction hardened to be able to run in needle roller bearings and the block also requires a fair bit of machining to accept the caged nedle rollers.
Can anyone provide some links...
