a98ws6

iTrader: (48)

What are some aftermarket heads I can use that will clear with a T-REX cam? Must be somewhat of a budget head. It looks like I am going to have some extra money and I might get a set of budget heads, but dont want to mess with PTV clearence issues. Just want to bolt on and go. I would assume with a T-rex, aftermarket heads, and a ls6 intake, that I would be over 430rwhp?

SVT THIS

iTrader: (27)

Any stock valved CNC LS6 or LS1 head would work as long as they are unmilled and using a stock gasket. Patriot and TSP seem to have the best deals on the CNC LS6 heads. Yes, you should be close to that number. It could be more if you ran full bolt ons and a Fast/NW90 setup.

However, if I were you, I would spend the money I was going to spend on the budget heads and just pay a shop to install the cam and flycut and run the GTP Stg 2 heads you have listed in your sig. If you got your compression right with those heads you could be approaching 450hp no problem.

EDIT: If you wanted to save some cash and spend a pretty penny the ETP 215s would work great and have more PV clearance than stock. You could probably get away with milling them down some and running a Cometic gasket to give your compression a bump. I am not positive but I think TEA Trickflow heads have more PV than stock as well.

a98ws6

iTrader: (48)

Guess I need to update my sig. The motor in my sig blew up good, and the GTP heads where the only thing I could save so I sold them. I am now building a new motor. A forged 347 with -2cc Diamond pistons. I dont want to go to a FAST intake right now, but will be running all the bolt ons, a race EWP, no PS, and the ls6 manifold.

dschmittie1

iTrader: (64)

my buddies SS with full bolt ons the T Rex GTP heads and a fast 90 setup made 462rwhp but he had to flycut with those heads

a98ws6

iTrader: (48)

Would you guys say go with a Fast 90/90 instead of heads? Im trying to get the most power I can with the extra $1k.

dschmittie1

iTrader: (64)

I think I would do the heads before the fast 90/0-

SVT THIS

iTrader: (27)

With the -2cc pistons you will have some more PV clearance. If I were you I would go with the TSP's LS6 heads. You could get the stage 1 package and upgrade to dual springs for around $1200 or so. Once you get the heads, I would check to see how much PV clearance you have with those valve reliefs. That should allow you room to mill the heads and run an aftermarket gasket. I would mill to 59cc and run a .040 Cometic head gasket. This will optimize your compression with that cam (which a lot of people do NOT do and wonder why their power is low) and increase peak numbers as well as increased power everywhere in the curve.

The LS6 will be enough for now as the heads will yield you more than the 90/90 setup. Give the milled LS6 heads a try with the .040 gasket-I would imagine 450/410ish should be within reach with the right tune. Post up your results!


EDIT: With forged internals, the most power you can get for $1000 would be a 200-300 shot of N20

Photochop

iTrader: (74)

See sig.

Cam is a t-rex clone on xe-r lobes, stock head gaskets, heads arent milled. Everything cleared w/o flycutting. Smaller valves will help to clear, keep the intake valve under a 2.02 and you should be fine with a slightly thicker head gasket if necessary.

SVT THIS

iTrader: (27)

Ryan, with his -2cc pistons do you not agree that he should run the LS6 heads milled down with a thicker head gasket? He will have more PV clearance with those pistons and could probably get away with a 59cc chamber and a .040 gasket.

Just curious but what was your compression with your TRex clone and unmilled, stock gasket heads?

WhtFast01

iTrader: (1)

I am going to be running a T-Rex with 58cc LS6 stage 2.5 PRC Heads with a .040 head gasket. BTW I also have -2cc pistons

Photochop

iTrader: (74)

I was told around 10.8-1...haven't checked it though.

I'd call TSP and verify with them your plan, like the guy that just posted above^ it sounds like that should work, but I'd ask them first because I know they bring the combustion chamber up more in the head when they run their cnc port on it. This may affect things too.

a98ws6

iTrader: (48)

But how do I know how much to mill the heads, and does TSP do that?

SVT THIS

iTrader: (27)

There is a compression calculator in the advanced engine section. If you can't figure it out, make TSP do it for you before you give them business!

Jason 98 TA

iTrader: (4)

We can deck the PRC street LS6 heads about .020" & it really won't effect p/v but .002" or so. We use a cnc newen seat & guide machine so keeping the valves setup perfectly is no problem! For guys with -2cc pistons you can deck the crap out of them, I think Diamonds are 160 deep so p/v is no issue!!!

JZ'sTA

iTrader: (23)

Stock Darts come as 62cc's and are in the budget class.
I cant remember if dart has a 3.9 bore 225 but if so I would check into that as well as the 3.9 bore 205's.
I believe they will yeild very close to stock P/V clearence but you will gain some good compression which can really help with the T rex cam.

orangeapeel

iTrader: (18)

TRex works good with stock heads. I would clean up the port work and leave the deck alone. 90/90 would have it's benefits and downfalls i am sure.

a98ws6

iTrader: (48)

What is the compression ratio line between pump gas (91 around here) and race gas? Maybe a mix?