The engines is a iron 6.0(.030 over) , weisco flatops w/l92 relief , WCCH cnc l92 heads milled .045 , l76 intake , ls7 head gaskets, 226/232 .609/.604 113 lsa, 1 3/4 longtubes, no cats (true duals), t56 trans.

It only made 400rwhp / 383rwtq with a tune . It seems a little low to me. Any sugestions?

 

no help?

 

What was the RPM's that you spun it too? What was the peak RPM's it made that at?
It's a 370ci Engine, what's the Compression Ratio?

 

my similar build (408) did 426/427. I was pissed. MY heads/cam/exhaust are all too small and my tune is off though. I imagine you need to look at your tune and new cam.

 

^^What H/C Combo are you running?

 

massive ported 5.3s (2.065/1.55 valves, flowed 319@600 and 298@500) and TSP 231/237 cam, vengeance racing ported 92/95mm REVX TB, 1 3/4lts/ory/bullet m6/10bolt.

also, was done on a dynomite dyno.

 

What was the dyno? Mustang/dynojet etc..
What is your diff?
Size tire?

BTW pistons are Wiseco

 

i would look at your tune first to make sure everything is right..those L92s like more timing thrown at them than the LS1/2/6 heads..
there's a couple of guys on here that have a lot of experience with L92 builds.Edcmat is one,i think that's how you spell his screen name..he's a sponsor on here..

 

dynojet, 10 bolt 4:10s, 275/40/20

 

6200 rpms , I can't remember the peak rpms , 10.5:1

 

Seems like cam is a little on teh small side with the duration, but really should not be the whole problem, should have made more still. Look at tune, and when you think you have looked at all the small stuff, look again. What was AF ratio? Plugs? Fuel pressure? Throttle body size? Is it opening all the way?New motor/just together? New combo? Old combo, new problem???

 

The Duration is good..right in the area of most of the ones in that range..

 

I physically looked at the tb and it only opens 83% but I was told this was normal by HP tuners with the trailblazer and ssr programs(the one I'm using with the ls2 tb) . f/p is fine, plugs are fine(tr6/.35),A/F ratio is 12.8-13.0 at wot. I even put the maf directly on the tb to see if the air intake was restricting the flow.