[oldman]

evil deed is done. I took .055 off leaving .025 shim.
Preload with no gasket is about .007, gasket is about .010 uncompressed. This should mean that the pump plunger is all the way out when on the lowest part of the lobe.

full stroke is actually pretty hard to check because you are pushing on a loaded spring. I checked it with and without the gasket with finger tight bolts. So this should mean at a minimum I have .007 before plunger smashed through the top of the housing... probably a lot more.

I could find my second .080 and see how much interference with the standard cap and my pump at the top of the lobe. I did check with the initial .080 just for eyeball and it would seem that I had .020 or there about with no gasket. Meaning that if I put the cap on and try to run it I would be looking at about .013 of plunger hitting the top of the pump 3x on each rotation of the cam... No wonder the blots fail after a time. I can see the bolts flexing .013 for 1000 miles, but after that.....snap.

So you have all be told, the cam grinders .080 cap is a failure waiting to happen. .55 should have been included by default. Sure the vendor will say "the thicker one can be sanded down"... right or you could just included a cap that would work for 99.9% of your customers.... If you had a mechanic put a big fuel lobe in, I'd check the clearance.