Not sure what Kevins reference for timing is but, when I bought a new balancer from butler the timing mark was not close to tdc. They offered to send me a new one but I settled for the piston stop and timing tape,,,,the rest is history.I suppose that's a round about way. The piston at TDC should put the timing mark at zero. The cam couldve been degreed? It's hard to imagine that anyone with the skill to degree a cam, would install rockers without verifying clearance.