Generation IV Internal Engine - Trickflow 235's on 404" LS2 - PTV clearance?




blk00ss
05-12-2012, 01:08 PM
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.


litle88
05-12-2012, 01:27 PM
Are the heads milled?
You need to know how much out the hole those slugs come out.

blk00ss
05-12-2012, 01:38 PM
Yeah forgot that. They're 64cc. Like I said on the pistons. Pretty sure the build sheet had the highest marked for .010 and most are .008 out of the hole.


litle88
05-13-2012, 02:45 PM
Oh damn I'm at 12.-1 with my Ls3 heads at 65cc chambers. Your gonna have to get some clay and a solid Ls lifter to make sure bud. It's pretty easy

blk00ss
05-13-2012, 06:36 PM
Oh damn I'm at 12.-1 with my Ls3 heads at 65cc chambers. Your gonna have to get some clay and a solid Ls lifter to make sure bud. It's pretty easy

Did some more experimenting with it today. Don't think I'm hitting the valves. It was just getting to where the cam was opening the valves. Lol. Told you I was in a hurry. Only took maybe a 1/8th of turn to get to torque from zero lash on the exhaust valve. And maybe a half turn to torque on the intake. Definitely need new pushrods. Got to get a pushrod checker.

litle88
05-13-2012, 07:02 PM
Lol definitely gonna need that checker, how much clearance was with the clay?

blk00ss
05-13-2012, 07:15 PM
Didn't check it lol. Heads are already torqued down. I'm going to roll with it. I did check it with the patriots, and the valves didn't even touch the clay lol.