Oldtexan

Newb alert. I was studying the list w/ the quickest cam only times, and it looks like the T-Rex is proving itself on the track. Did alot of searching and could not find anyone running the cam with ported heads. If there is, please post info! I think I am going to run the cam with a set of FFHP stage 2 heads. Looks sweet for the price, CNC'd by TEA and hand finished by ffhp. Sound like a strong combo? I know I can't have them milled (ptv issues), but would the 5.3 heads be okay unmilled? I can't notch my pistons.

The Juggernaut

iTrader: (7)

You can't put bigger valves in either.

Oldtexan

So unless you have aftermarket dished or stock notched pistons, you are stuck with the stock heads? If so, forget the T-Rex.

The Juggernaut

iTrader: (7)

You should contact Jason @ thunder and see if 5.3 heads will work.

That cam makes big power on stock heads.

Fireball

iTrader: (21)

since PV clearance is very tight with stock heads/stock valves...I'd be concerned that even with unmilled 5.3L heads that the larger valves will be awfully close.

jrp

iTrader: (16)

with some good flowing heads you dont need a cam the size of the t-rex to make great power or haul *** down the track.

BuckeyeROC

iTrader: (7)

You can get a custom cam made similar in size, but spec'd for whatever heads you get.

Oldtexan

I agree 100%, however, when you consider what it makes with stock heads I can only imagine what it will run with some 300+ cfm heads. But if everything is too tight with it, then I think I will run the G5X2 or 3. I don't know, it would almost be worth it to notch the pistons for the T-Rex and see what the heck it would run. But what a PIA. I wasn't a believer in these big cams until I installed one, and drove it on the street. They are in fact streetable and very powerful. Now I gots to have one lol.

STLWS6

iTrader: (5)

I would set the whole car up get the Intake and Heads you are going to be running and have someone grind you a custom camshaft to match your entire combo.

Kenny D

Im going to be running the g5x3 with some custom ported ls1 heads. I am getting the pistons fly cutted just for extra safety with the bigger valves.

BIGBOS

Can't you have some custom head work done to where the notch the valves back in the head surface to provide the extra room?

I've heard of this before

KGSloan

this can be done. the heads can have the valve sunk into the seats further giving more clearance. however, this may effect airflow into the chamber.

Stu'sWS6

iTrader: (3)

We will soon see, I am going to run this cam in my 346. I previously had the tr230, with gtp stage 2 5.3's-11.8:1 cr. I have wiseco flat tops with valve reliefs. From my experience this weekend at the track with the 230, I think this cam tuned will put me in the 10's even in this soupy mess AKA St. Louis summer weather. I have 2.02 1.57 valves, I am definitely checking pv clearance and degreeing the cam-Paul seems to think I will be ok even with the 5.3's milled .035. We shall see

blue2kss

I just finnished assembling mine with a t-rex cam,AS stg.2.5-ls6 heads and a 90mm lsx intake/lsx tb. I hope to be tuned on thurs. My last setup g5x2,AS stg.2-5.3 heads and a ls6 intake shaner s2 made 457/417 that was through the stock 10bolt. I've since added a strange 12 bolt with 430's an a spool.

Any guesses at what I'll put down ?

Jason 98 TA

iTrader: (4)

I've been talking with Terry @ Patriot on getting the larger style camshafts to ported heads. What we've done to this point is go with the 59cc ls6 style heads with stock size valves. You get the extra compression for the low end help, and you get good flow even for a stock size valve. Or you could just cut the pistons & put a big valve in also!!!

SMOKIN01TA

iTrader: (10)

i would have guess with a stock rear and that combo you would have put down 480's. With the stock heads, 12bolt and 4.56 with a posi i went mid 430's on a shortbelt. and jason went mid 450's with short belt and 90mm stuff on a stock rear. so with head you should have picked up a lill more imo. what kinda cfm do those heads flow, who tuned it? but to answer the question you should lose another 15rwhp from the install

blue2kss

with the addition of the rear i dyno'd 442 i lost 15 like you thought this was last fall that was 410 gears and a posi. i switched gears an added the spool. so you think that i will only gain 20 or so RWHP with the better heads 325@.600 as opposed to 306@.600 with the old heads. the 90mm lsx against the ls6 an the t-rex instead of the g5x2. People are seeing those kind of gains from the intake throttle body swap only. I have'nt had the car tuned yet it will hopefully be done on thurs 7/22

Oldtexan

Maybe a set of ported LS6 heads from SDPC would be a good choice to run with the T-Rex. They have stock sized valves. The question is, would a slightly smaller cam, like a G5 series, along with some killer big valve heads, make more power?

SMOKIN01TA

iTrader: (10)

oh sorry dude, i miss read your first post, i thought you dynoed that with the trex.
if you are changing heads, cam and intake, asuming you have a m6 car, you should see close to 500 rwhp imo.
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DanZ28

iTrader: (5)

As far as the trex vs G5x2 alone, i think you'll only see about 10 RWHP difference between the two as far as my own experiance. For me, I went from the TR230 to the Trex and gained 17 RWHP. Did 413 RWHP (A4) with the TR230 and ABS S2 heads (307 CFM @ 600) and 430 RWHP with Trex and same setup.

With the better heads your getting, you might pick up another, lets say 10-15 RWHP, IMO. More if you port the LS6 manifold and a bigger TB. It will be very interesting to see your numbers when it's all done. Good luck!

Dan