Rebuilt engine, bent push rods?

Man, I'm sorry I didn't respond sooner. I took a short trip. What caused my coil bind was : 1) I Had the heads shaved .010 2) I used the old springs with a new cam and lifters. 3) The springs were weak so the machine shop shimmed them as much as .020 to help increase their pressure. That along with the shaved head shortened the travel of the spring by at least .030. 4) I used the same length push rods as before the mods. All this caused the push rod to travel more than the spring could compress thus going beyond the travel left in the spring. The engine ran strong for about 50 miles and with each stroke of the engine bent each rod and a couple of valves in #2 till the valve gave way and broke in half. Then the engine sucked the valve and the engine quit.

Like some said earlier ask the machine shop if they shimmed your springs and always check for coil bind when you do something to your valve train or heads. Check each spring, intake and exhaust when the valve is at the full open position. You can use a feeler gauge for this. As far as how much room should be between the coils, .060 sounds good.

Good luck