The PAT WS6

iTrader: (14)

i was on thunder racings web site and seen the were running the trex on stock heads pushing out 450rhwp! damn
but is that a legit setup? im worried about the valve to piston clearnace......wat type of springs would u guys recommend with that? as well as swappin out the rockers,seats,retainers,push rods? is it nessary to swap the seals?

is there anything else that yall would reccomend?

thanks

Studytime

iTrader: (15)

The Comp 921s are the recommended springs. Yes, the TRex fits in a STOCK LS1 engine. It is legit. Most of the really fast cam-only cars run the TRex cam. There was a lot of R&D that went into the development of it. The objective was to produce the most powerful cam that would fit in a LS1. Many grinds were tested each with several ICLs and after months of dyno testing... the TRex was born.

This cam has hit 450RWHP several times, but not every combination is that stout. It will take a lot of fine tuning and nailing of the small details to get to the 450rwhp range. Something a little bit south of that is probably a better goal to have in mind to avoid dissapointment.

Ben T.

CamaroSS

iTrader: (2)

Stick with the stock rocker arms, don't get the Harlands, but the other lighter roller rockers seem to be pretty decent, just not worth the money to me.

I run a TRex, it's a badass cam. Many people bad mouth this cam with no grounds either. Statements such as it not being drivable, or it doesn't make power with heads are just not true. Daily drove my TRex, sure, there are some sacrifices that were made. (4400 stall converter) But in a 6-speed it would be my second mod....after a rear end!

So TRex it up, and welcome to the world of a choppy idle, even at 1500-2000 you can hear it camin out!

Studytime

iTrader: (15)

It's hard to argue with a full-weight daily driver that goes eleven-two-s ...with stock heads.

Ben T.

chuckyt1

iTrader: (33)

The Rex can be tight on PTV but it should clear. I checked my PTV when I put mine in and ended up milling the heads and fly cutting. Couldn't be happier and I don't even have a tune yet... I went the PRC dual springs

Studytime

iTrader: (15)

Good info Chuck. On any big cam, it's not a bad idea to flycut for 25K miles later on when you're lazy don't check valve springs and float your valves. This way you don't end up with a dozen bent valves and the need of a new valve job. Or for 2am when you overrev your motor...

Also, compression is your friend!

Ben T.

bursty

I just finished installing a T-Rex cam package from TR. It will be with the stock heads, 6 speed, and 4.10s in the rear. I think it will be relatively streetable, as long as I can figure out what I'm gonna do for a tune.

450rwhp would be niiiice, but I doubt it.

The PAT WS6

iTrader: (14)

i think i am deff gonna look forward to this cam. u just can not argue with 450rwhp on stock heads. it will be goin in an m6 with 4.10s. so you guys are sayin to cut the pistons or wat? i would hate to have any problems on down the road.

btw how does this cam respond to n20 i heard it does not like it to much any one wanna chime in on it?

LS1IMPULSE

iTrader: (42)

doubtful that you hit 450 to the wheels, not to many T-rex owners have done this. I just replaced my T-rex with and F14 and did a heads swap, T-rex left eyebrows in all 8 pistons.

Patrick G

iTrader: (14)

It takes lots of the right bolt-ons, but I recently tuned a guys cam-only SS that hit 455 rwhp with the T-Rex. Keep in mind, he was running QTP headers with high velocity merge collectors, cutout, FAST 90 with Nick Williams 90mm TB, no MAF and excellent tuning with a WB O2 sensor. His car made more power than many heads/cam cars I've seen. The T-Rex is for real.

LS1IMPULSE

iTrader: (42)

Definatly, but those are some high dollar mods, and for the price of the 90/90 combo alone you could get a set of Patriot/TSP LS6 heads and have a H/C combo that has great drivabitly (which you can get with the T-rex, but you better know a damn good tuner) AND, you can gain alot of lower end power over the t-rex.

CamaroSS

iTrader: (2)

Or you can run a FAST 90/90, heads, and a TRex and scare children....that is my plan. haha

ALLBOTTLE

iTrader: (13)

A bit Biased maybe...... J/K

The cam is a monster, make sure you have the supporting mods such as the proper converter or Gears to keep the cam where it likes to be. One of the Best sounding cams i've ever heard.

LS1IMPULSE

iTrader: (42)

Cam is definatly a monster, there is a reason why its hold down how many spots in the cam only list, BUT...for the thread started to reach 450RWHP with this cam he would have to replace pretty much every bolt on he has with the best of the best stuff and find a great tuner to put in hours and hours of work.

transamfreak01

iTrader: (8)

yeah this cam is a monster. a buddy of mine has one and his daughter gets scared when he starts it. i bet with all the supporting mods and this cam it wouldnt be to hard to hit 450rwhp but of course it will take a pretty penny to do so. oh and also what rear end did the car have when they dynoed it? maybe that could play a factor too

ALLBOTTLE

iTrader: (13)

a 12bolt is good for 1-1.5% max a 9" slightly higher.

With a cam like this in a 346 it's going to be about maximizing the flow of air in and out of the motor. Just a small restriction in the intake tract can have have a huge effect on port velocity, same with a less than optimal header causing some reversion.

Take it to a competent tuner and it'll run besides if it run's the times who care what the dyno says.

The PAT WS6

iTrader: (14)

the only thing that is holding me back is comparing this cam to say a ms4 or g5x4

chuckyt1

iTrader: (33)

You can't go wrong with any of those. As far as fly cutting, I highly recommend it, then you can go with bigger valves, mill for compression, etc.(and somebody just stuck a great writeup on it) especially if you are going to do heads. Also, you've got an M6. One mechanical over-rev, and the valves will "self relieve"...

And oh by the way, I am partial to the Rex. Everytime I start my car it sounds like it "wants to eat"...

LS1IMPULSE

iTrader: (42)

If your stuck on a big cam like the ones listed, then I would go with the T-rex.

The PAT WS6

iTrader: (14)

ya i want deff want a fat cam. how hard is fly cuttin the pistons. and where is the write up on it?