My 170 promaxx heads got upgraded stem seals and the valve stems needed polished. The guides were a little tight for my machinists liking. Everything else was good. Concentric was spot on.
Same here. Valves a hair right for my liking. But otherwise good. Mine are the CNC Shockers. I widened the pushrod pinch with a brass tube insert and a minor trim for the gasket. Otherwise, they were really very well built.
The valve springs don’t meet the requirements of the cam I’m running. So they were swapped out for the cams matching spec requirements. Not a big deal. Valve spring heights were spot on and rechecked with the stiffer springs.