I am posting my results on the few forums I belong too. It's really amazing what a good tune can do. The heads really surprised me.

Thanks to everyone who was involved:

Jason from TSP for his recommendations and for getting the compression on the heads to compliment the cam and gaskets.

Rudy- who installed everything, amazing work!! and those who helped him out... Dan and Steve

Patrick G and Kurt (the guy who has the dyno). These are some down to earth nice guys, professional and passionate about their work. Patrick is great and is very detailed about his work. I got to ride at WOT in his car....insane, sick and ridiculous Everyone at the shop was professional and great car enthusiasts!

Ok so these PRC heads are the LS6 stage 2.5's =$1300. I have stock: gears, rocker arms and water pump. My 90/90 set up is not ported. This combo just worked out well. Here's what I did...

 

The rwhp is about right for a properly setup car (I made 471 rwhp on unported Dart 225s and a FAST 90/90 with an F-15), but the torque is very questionable, which makes the entire graph questionable. There's no reason you should be making 383+ cube torque on a 346. If that dyno is a 224 Dynojet, I'd question the calibration. If it's a 248, then it's probably accurate.

Nice heads.
My $999 heads work well on my 408. There's no reason to dump a bunch of money into heads if everything else doesn't match up.

How much compression and what's the CC size? A cam of that size and huge lift with small combustion chambers (probably milled) along with a 112 LSA (I'm assuming 4 degrees advanced) will need the pistons flycut. Are they flycut? If not, you better not miss a shift unless the cam is not advanced at all.

Lots of questions I know

Mike

 

I was told by both Pat and Kurt that the #'s might be a bit off BUT only about 2-3 on hp and maaaaaybe 10 on TQ. However, because the pulls were one after another without cool down and it being 97+ degrees, I would gain that right back in cooler conditions with cool downs between each pull. The only way to know for sure is to take my exact same set up, and put it in another car and run that one with a Patrick tune. They may not be exactly the same but if they are close then we would know its not a fluke and it's just that combo that happens to work well.

The heads are 230 intake runner, 64cc, milled to .005, either 11:5:1 or 11:6:1 I have to ask Jason at TSP I forgot. NO need to flycut, it's not advanced. Gaskets are .040

 

That doesn't make any sense. Stock GM gaskets on my old heads/cam setup with a 62cc head milled .020" to 59ishcc gives around 11.3:1 compression.

64cc milled to .005 (maybe a 1cc total drop) would be around 63cc and with a .040" gasket would be around 11:1 on a stock bottom-end.

You must be running smaller valves (under 2.05) and absolutely no advance on the cam to clear something like that with .640+ lift.

Don't miss any shifts

I'd still question the torque and take it where they are running a factory-calibrated 248 Dynojet to get some back-up numbers. Your torque is at LEAST around 20 lbs-ft too high for a 346. Most 346s don't put down over 430 rwtq on motor unless they are running serious compression, solid rollers, etc, or the dyno is awry.

Not an accusation, just an observation

Mike

 

The Mustang dyno it was on has been proven time and time again to be within 1-2rwhp and 4-8rwtq of a dynojet. When a person like Patrick G and his buddy Kurt who together have tuned countless LSx cars keep telling you that your torque is impressive, then you know its not the norm. They are also very well known and have a rep to protect in the LSx community, I doubt they will keep putting out cars with numbers that are 15+ off. they are just to much of perfectionists to have that happen.

Plus after seeing these guys work, I doubt anyone will take nearly 5 hours of their day to tune your car right which these guys did. They may not be the definitive answer to tuning BUT very few people anywhere in this country are any better. Plus I will stick with the guy who's 346 puts out 508rwhp n/a.

 

More power to ya

 

Hey I Have A 98 Camaro Ss And I Have The Trak Cam And I Am Planning On Gettin Prc Ls6 Heads From Texas Speed. I Dyno At 390 Rwhp With Trak Cam, Lt Pace Setters, Ls6 Intake, My Throttle Body Was Stock Unported And Now I Have A Slp Pulley. Did You Get That Much Power Out Of The Heads I Understand A Little More Than Me Because You Have The Fast Fast 90 Set Up Witch Is Like 15 Hp Over Mine. What Do You Think I Will Get With The Ls6 Prc Heads The Trak Cam And Full Bolt On And The Ls6 Intake. I Have Been Told 440 If I Am Lucky What Do You Think Yours Seems High Is It The Tune?

 

Yes, without a doubt. I honestly think he can sqeeze out a bit more from anybody's car that has already been "tuned" by someone else. But consider a few more things that may have contributed:

My Xpipe is 3" straight pipe that is dumped no cat no mufflers, which may account for a couple of hp over a cat-back system, the bigger injectors, descreened 85mm maf, and the Volant CAI which is less restrictive than any airlid, the PRC heads compression was done to match the cam and the gaskets (cometics .040) . All of these things I am sure added a bit more to the mix as they are all beneficial. But how much is not known. But the #'s are all the proof I need Plus my car is an 02 which could mean it's a factory freak!

With the same tune I don't think you would have a problem hitting 440. If you did everything I did above minus the 90/90 set up then maybe around 450 ish or a hair more. But that is just a rough estimate.

 

I'd ask for a better graph. Nice numbers, tho...

 

Jamie if you see numbers anything like like 440 or above i'm definitely going with those heads since our cams are almost the same. Yours is just a Thunder Racing *** Kicker and mine is a Thunder Racing custom grind *** Kicker!

 

Yea Thats Me Aron I Knew I Saw This Before. I Forgot I Have That Cut Out Now And I Have Herd Those Have Decent Gains. Well We Should See Good Numbers And Here Is The Proof That Those Heads Are Good. Yea Thunder Is Good For Proven Cams I Have Herd Of Nasty Numbers From The T-rex.

 

SWEET I HAVE A CUT OUT NOW SO THAT SHOULD HELP TO. SO I CAN USE THOSE COMETIC 040 GASKETS AND HAVE NO PROBLEM. JUST WOUNDERING BECAUSE I WAS TOLD BECAUSE THE LIFT BEING SO HIGH YOU WANT TO USE STOCK THICKNESS BUT IF YOU ARE OK THEN I WILL GET THOSE. PEOPLE ALWAYS THINK THIS CAM CALLS FOR YOU TO FLYCUT BUT THEY DONT CAN YOU TELL ME WHY I HAVE MISSED SHIFTS AND I AM FINE. THANKS

 

really, you got those numbers on a mustang

 

yepp I have pics want to see them??

 

Do you have flow "s for the heads? I haven't seen any for the PRC's yet. My buddy has the same set just not milled.

THe TRaK cam isn't overly large, but with milled heads it's enough to risk PTV issues.. Nice #'s for sure, tho! Most of the TQ comes from keeping the EXH valve closed longer and having it reach max lift QUICK when it opens.. Compliments to the rapid rate on the XER lobes.

I'm hoping for the same #'s on my TF heads and MS3 coming soon.