I fitted the Comp 8921-16 lifters a few months ago, cam is a Comp XR292HR. They always rattled for a few seconds when I started it in the morning and twice now I've had one or more lifters collapse. The first time it happened it was just one lifter and after running the engine again for about 15 seconds it pumped back up. Yesterday it happened again, this time two lifters had collapsed. One pumped back up after a while but the other refused.
I now have the lifters out of the engine and I'm going to replace them. I want to use a set of Morel lifters, part number 5319. Will the pushrods still be the correct length if I use them? In other words is the distance between the roller and the pushrod seat the same?

1970 Road Runner 505 cid MCH CNC ported Stealth heads MP 528 camshaft 4 speed GV overdrive 11.98 @ 117 on street treads