Just got some trickflow 235 6 bolt heads bolted onto my 404. Installed one set of rocker arms, and pushrods. Went to turn the motor over slowly. It stopped half way through the cycle. Took rocker arms off, turned motor over with no problem. Using a 7.450 PR. Haven't got a PR checker yet. Wasn't going to run without checking, just wanted to see how close I was going to be. Could the wron size PR make the valves hit the pistons? Here's some specs on everything.

-2cc diamond pistons
.010 piston out of the cylinder( I BELIEVE )
254/257 .612/.612 @ 110+3 custom Pat G cam
Stock GM MLS head gaskets (.054 compressed I think?)

I ran this motor before with patriot stage 3 317 heads, with the same cam, and didn't have any problems. Actually made 500whp with the same exact combo. I'm leaving for work so I haven't messed with it anymore. But was just trying to get some ideas to try tomorrow. Thanks guys.

I posted in the gen IV section as well. Haven't been on in a while, not sure which one gets frequented the most.

 

I'm thinking your pushrods might be too long....with the rock at 0 lash how many turns did you have to go til you hit torque...should be around 3/4-1 1/4 turns max to torque.

Also you WILL need valve reliefs for this cam, and even if you had them cut with the old heads the change in valve angle might have you missing you old relief cuts.

With the trick flow heads you need to set everything up again because they are not a stock type casting.

 

They have valve reliefs. Not sure how many turns it took. I'll check tomorrow. I'm hoping the pushrods are the culprit. Not sure what else I could do to fix this.