Started up our rebuilt engine today and right off there was a pop and then valve train noise from the drivers side valve cover. As we ran the engine to break it in the noise got worse so we shut it down and pulled the valve cover. We found a bent pushrod on #7 cylinder, replaced it with one of the used ones we had and all is well. We finished breaking in the engine at 2500 RPM's for 15 minutes and changed the oil. Cranked it back up and all is well, no noise at all. Now did the small backfire bend the pushrod?
The Cam specs are 212/218 duration @ 0.050" lift.
.477/.484 lift on a 110 LS
We set it a 4 degrees advanced
Springs are CC 926-16
Jim