ssfast99

iTrader: (3)

I have all the bolt ons with LT headers, LS6 intake, SLP underdrive pulley, and a T-REX cam. dynoed 410 rwhp and was wondering what set of heads are best for this engine sense it still has stock heads and how much power I would see changing heads. i would like to run a 175 to 200 shot soon so i need a head up to the task. thanks in advance for the help.

SVT THIS

iTrader: (27)

You'll need something with stock valves like a CNC LS6 head if you don't want to flycut. If you've got the money, I've seen a guy running a TRex with ET 215 heads manage 10s in the 1/4. I'm going to try and save for the ETPs, but if time gets the better of me I may go with some Darts. I think you will have a better DCR with an aftermarket casting. I'm sure some others will chime in with some good info for ya.

PREDATOR-Z

3 ways without flycutting:
1- CNC your own heads (stock valves)
2- LS2/LS6 243 casting CNC heads (stock valves)
3- My favorite if I had to choose (6.0 casting with stock valves and 59cc welded chambers), I know PP can do that.

half-n-half

iTrader: (7)

is number three not going to affect valve clearance?

Thanks
Louie

eamador11

Get AFR 205s, they are the best heads

PREDATOR-Z

It shouldn't, these are welded chambers, not milled. Valve drop should be the same as stockers.
Talk to Gunnar, I'm sure he can throw some more light on this.
I know TSP can recess valves to increase clearance by .020 as well.

moeZ28

iTrader: (7)

I got one to add to your list:
4- Aftermarket pistons with valve reliefs, CNC ported heads milled 0.070, 57cc chamber, 2.02 intake valve, 1.575 exhaust valve

Well at least this is what i did!!

PREDATOR-Z

Moe i said no flycutting, which is easier than rebuilt bro.

moeZ28

iTrader: (7)

i know, just bored and goofing around.

ssfast99

iTrader: (3)

hey moe thanks for the info along with everyone else. i was wondering what numbers you put up in the 1/4 because your running my cam too and if i like it i would like to go with your set up. thanks.

moeZ28

iTrader: (7)

I wish I had some numbers for you but my motor is still in the garage waiting to be put in the car. its all built now but its not in yet. I dont really know what its gonna do. Some people think 440, 450 to the wheels NA, but i just hope it fires up and doesnt blow up!!!

ssfast99

iTrader: (3)

hey what do you guys think about the PRC 2.5 cnc ported for 1400 are they worth it or price is cheap and so are the heads? that is a question not a statement.

SVT THIS

iTrader: (27)

For that price I would go with the Dart heads. I don't know much about the PRC 2.5s though sorry.

Flash99

iTrader: (48)

I think corrected you make 379.1 thats what the shop said anyways. Your 410 was uncorrected, so with heads you probably will achieve the 410 your stating. As for the nitrous I wouldnt expect your motor to hold up that long with the setup you have. You might wanna look into getting some good parts for your transmission. I remember when we raced last year, your 2nd gear was going out, but you managed to get it home and still drive on it till this day.... Thank god those T56's hold up great.

Also make sure you get a window switch, WOT switch, and use some good gas. You might wanna look into a 1st gear lock out switch as well. Also with that much power you probably will need a good rear end, and some sticky tires. My blue car is running 11.33's with the stock rear, but its starting to clunk, so it will probably go anyday now.

xfactor_pitbulls

iTrader: (16)

First off, you should go with another cam, custom grind or the right off the shelf. The T-Rex is going to bleed off some of the spray. Also, with a 200 shot, go ahead and get good stainless valves. You probably will not have a problem, but stock LS1 valves have been known to tulip under extreme pressure. Get some ferreas or manley extreme duty. Not only will they be stronger, but they have a better back angle, and more material to put a good back cut on. Stay away from stock valves/valve jobs for max power applications.

Brandon

JZ'sTA

iTrader: (23)

You forgot the most powerful option.
ET Performance 215 or 225 heads.
You can run a 59cc setup with no problem using the ETP heads.
They give quite a bit etra P/V clearence then the stock head does.

SVT THIS

iTrader: (27)

Does anybody know what the DCR with a 59cc ETP 215 and 225 head is? I have been thinking I may run cam only for a while and use this head later down the road. Which runner size would work best on stock cubes-215 or 225?

Fireball

iTrader: (21)

depends on what your SCR is...what head gasket do you plan on using?