Cam regrinding question

The correct answer is, "sometimes". It's totally dependent on the core's condition and "what" grind you choose. Also, if you're using non adjustable rockers, the answer is "most likely". Since the hydraulic lifter plunger does have a range of travel, if you are still within that range after regrind, you'll probably be ok. But chances of that are pretty slim. I got chastised because I didn't change to a shorter pushrod on my current slant 6. Everyone said my geometry would be way off. Well, it's not. In fact, the rocker sweep is almost ideal. The reason all the know it alls said was because of the .155" I had milled off the head. Nobody thought to include the reground camshaft, which would, by itself, require longer pushrods, while the head mill would require shorter. So in effect, they cancelled each other out, once again proving the resident tech heads wrong.

But the bottom line wen changing anything regarding the valve train is MEASURE what you are going to use. That way there'll be no question about what you need.