Need some advice:



I recently had a set of unposted "G" heads rebuilt at a local shop (hard seats/stainless valves). While not a race-quality engine shop, they generally do an acceptable job when it come to getting motors rebuilt and back on the road. I have been taking measurements to check their work, but don't really know what level of precision is acceptable for a street motor, or the point of diminishing returns if I decide to spend more $.



Problem #1: Several seats are cut/lapped deeper than the rest. I measured the valves before installation (all to spec.), and now one stem is .040" taller than the shortest. A few are .020" taller. How much latitude do I have before rocker geometry is off enough to affect guide wear? How much can I file off the stem before surface hardness is compromised? Is this enough of a problem to warrant the expense/trouble of replacing/re-cutting the deepest seats?




6 VOLTS/POS. GRD. NW INDIANA