Lexicon

I need the opinion of the experts. What heads would you put on an LS2 intended for FI using an A&A kit? I have been out of the loop and so have lost track of what people are putting on the LS2s. This is for a track car driven on the street a lot - never have done 1/4 mile - I care more about a usable power band with as much RPM range as possible. Headers/exhaust, gears, and rear diff good for 700hp is done. Yes...I will add a cam but leave that out of this for now. Looking to get the heads issue resolved and am limiting the options a bit due to cost.

1) Yella Terra Ultralight 1.8 or 1.7?
2) What spring kit? Patriot Gold @ 375 max spring pressure or upgrated to Xtreme Springs P/N 8501-BSBC with 410 max spring pressure?

Is is wise to get a bigger combustion chamber to lower the compression a bit?

LS2 68cc 2.08/1.60 P/N 2035
OR
LQ9 72cc 2.08/1.06 P/N 2019
Or
LS3 heads (I am out of the loop on the difference w/ LS3s)?

If I recall correctly, I can use my stock intake with the LQ9 but not with the LS3.

Thanks All!

FloydSummerOf68

If this is a track car that doesn't see 1/4 mile then I'd look into something other than FI.

If you're looking to make 700hp I'd probably skip heads and just do blower cam, meth and centri. You won't need heads to get to that point.

Lexicon

No meth and 700hp is not the target. The result will be less HP. I cannot tell the difference between the GM ported LS3 heads; P/N 88958758 for $600 might work if I add a spring kit for $300 and source an used intake. I cannot tell why there is a different LS3 GM head for $1000 P/N 19201805.

mdaniel

Stock heads are fine.

FloydSummerOf68

If you want to stay under 700 a blower cam and blower will easily accomplish that.

Luv2Fly

Lexicon

Are you all saying the stock heads are fine because under FI the flow rates are not as big a deal? If so, what about putting on a spring kit and the Yella Terra with new pushrods on the car as is.

It would be great to not have to pull the heads if you are telling me that there will not be HP gains.

winters97gt

There are big gains to be had with heads, but what everybody is telling you is that you don't need aftermarket heads to get the gains you want. A good blower kit(ECS) and a cam will get you the power you are looking for.

locosmith

@Lexicon I heard the same thing from different shops and ppl. If you're staying naturally aspirated you def need diff heads but with forced induction it seems it's a lot simpler to just turn up the boost.

Lexicon

That is some good advice. I will still upgrate the rockers, springs, and pushrods to keep the top end doing its job. All of that is easy to put on. Unless anyone else want to chime in, I will skip new heads.

Stick with the stock ration Yella Terra 1.7 rockers or go to the 1.8?

Do you all agree that the thicker wall .105", 5/16", 7.400" (8406-16) comp cams pushrods are the way to go and not the .080, 5/16", 7.400" (7955-16) wall thickness?

Can I get the final word from A&A?

Lexicon

Please throw in some blower cam suggestions. It has to drive well. What about one of Andy's cams or the Night Fury?

ashanson

I will agree with those above, no need to get better heads if you aren't doing a max effort build. Upping the boost is cheaper/easier than getting new heads. I'm making 640whp on stock LS3 heads (upgraded springs only). I could probably run a few PSI less boost and get the same power on CNC'd heads but is it really worth the price?

Edit: I run a fairly big N/A cam (239/247 on a 427) and it seems to make good power, but it's not a street friendly cam.

0Slowhawk

Stock heads with a mid to high 220 cam. Will put you in the 600's easy enough. Stock rockers and .080 wall pushrods.

EuroRod

FYI. A supercharged C6 that is tracked is going to have some serious overheating issues with both coolant and oil temps. With my ProCharged C6, I also run a Ron Davis radiator, Meziere EWP, big oil cooler and a 160 t'stat. After 4 or 5 back-to-back WOT runs from 30-150-ish, the temps are at the limit where I feel comfortable. I can't imagine tracking the car for an extended amount of time, and the car not seriously overheating.
If I was going to road race or auto cross my car, I would look for hp by means other than hot compressed air!

Deezee757

I'm at 648whp and 599tq with the ECS 1500 and night fury cam.

Josh@AandASuperchargers

Agree with others, for your HP target stock head will work just fine.

Check out the power these LS2 cars with stock heads (some with stock cams) are making with our kit...
http://www.aacorvette.com/blog/?p=2395

http://www.aacorvette.com/blog/?p=2080

http://www.aacorvette.com/blog/?p=1961

http://www.aacorvette.com/blog/?p=1835

http://www.aacorvette.com/blog/?p=1541


A&A stage 1 cam would put you at 600+ WHP with great drivability.

Lexicon

Thank you all for the responses. I am tossing on a FAST 102 for fun and getting the car cleaned up. Waiting on UPS at this point!

FloydSummerOf68

I think most of us would've advised against that as well

No harm though; it'll still pick up power over the stock intake.

greerracing

A set of really good looking heads that i found that are descently priced are the trick flow as cast heads if you really wanted heads. Everything i have seen though if you put a cam in the car and some meth injection you should reach your power goals. If your tracking the car i would definitely run meth injection as it will help keep iat down which should help keep the motor living. Or switch to e85 if it is available in your area as its the best bang for your buck; power and safety wise.

Lexicon

I had a rat get under the hood and tossed a bunch of leaf litter and maple tree seeds down into the bolt recess for the heads. I needed to take the intake off to clean it out and there was a good deal on a FAST 102. Some of the things I am doing is for safety margin and longer life in prep for FI and I don't expect much extra HP.

Where is that UPS truck?