What have you heard about the GM Performance Parts CNC'd LS6 heads? They are very reasonable in price ($985ea fully assembled from Scoggin-Dickey) and do not require a core. I'm not interested in all out to the last horsepower performance - more of a best horsepower to dollar ratio. I really like the Cartek Stage II LS6's, but we are talking $2500 PLUS $1500 core charge If the GM parts only make 20 less horse - I can figure other ways to spend the remaining $2200 to make more power - i.e. LS1edit, bore kit. Last I heard Cartek was making about 440 rwhp with LS6 heads, .580 lift 224/224 cam, ported TB, headers, and LS6 intake. They have a 60cc chamber, so what CR does that give with stock pistons? Also the heads are milled to get this lower cc, so does it through the intake match and angle off? Please let me know of anybody's experience with these heads.

 

You would probably have better luck with this on "LS1 Tech"... moving it there....

 

I haven't heard anything about them. They do sound very interesting though. Anybody know anything about them?


-Mike

 

Go check out corvetteforum.com for some good prices on LS-6 heads...as for the heads, I'm running them with FLP's and I'm gonna upgrade to a 228R cam with all the fixin's...I think you'll be very happy with the heads.

Good luck

 

SDPC likes to run up to 570 lift cams with the CNC LS6 heads.

I think they are a great bang for the buck.

Keep in mind that stock LS6 head cores are like $1200 shipped from SDPC.

One user on www.ls1tech.com is Ruqukr and he's gone like 10.7's with these heads, a custom cam, a light car, and a stock bottom end.

 

I read that the heads are $985 completely assembled with NO core charge. I am I wrong? I am running the TR224-112 cam with .581 lift - but I surfed around and saw the flow comparison chart on LS1tech and the GM CNC LS6 heads still make good numbers beyond that. So i'm not too worried about the .570 SDPC #'s. I'd swap over my Isky springs and tit. retainers to the LS6 heads. My biggest concern is two fold:
1. Guys out there with these heads, how are they on the street? My car is for the street with the ocassional drag/street race. How is low speed throttle response? I'm hoping it's not too bad as the heads still have smallish intake cfm #'s at lower lift. It is imperative that the car still retains drivabilty and reliabilty. I still take the car on 600 mile trips in the summer.
2. The heads are milled to bring the chamber cc's down to 60. Anybody know what ballpark CR this is with stock bore/stroke/pistons. With the milled head are the stock length pushrods OK? I already have chrome moly comp cams stock length parts in the engine. How about the intake mounting angle - does it match up with the new heads correctly.

Thanks guys.

 

suposedly, 11.2:1

gotta be careful with these heads. May not pass emissions with this higher CR

 

I have seen mid 22_//114 stuff pass here in IL.

I have heard of 112 stuff squeaking by.

I would not worry about the compression but rather the cam specs.

GM CNC LS6 heads are a super deal, check out www.spdc2000.com to check out the pricing.

 

I moved from Pontiac IL to Michigan now - so all emissions stuff is out the window. No cats, no AIR, no EGR, no nothing...... And one rear license plate so no getting pulled over for no front plate
The 11.2 CR sounds good for the steet - I always run at least 92 octane, higher when available at the pump. I would not want any higher CR as chugging down the road in 6th gear with the AC blasting in 100 degree heat is a pretty hard on the engine (detonation wise). As mentioned the car's main use is road trips and cruising - albeit with my foot in it most of the time. I race sprint cars so I get most of my thrills doing that So any word on push rod length or intake mating surface match-ups??

Sorry moderator, this post keeps going to LS1 tech each time even after you moved it to Advanced

 

ttt

 

Here is a link for the heads http://www.sdpc2000.com/cart.asp?act...art&catid=1979

Great deal, and you can sell you cores for 200-250 !!!

 

You can run 11.5:1 on pump gas but you have to have the timing set right.

I did 475rwhp/505rwtq in my ARE 422ci ironblock with 26 degrees of timing and pump gas.

 

What 240+ looke-lous but no info on pushrod length and intake match-up Come on guys!!!!
As I said the 11.2 CR is just what I'm looking for. I am also keeping all the stock parts off the car (especially the heads!) so the no core charge really made the price attractive. My car is special order 1 of 1 car. It has no power windows/locks/cruise control/seats/Y2Y options. Only splurge was the SS grille and Hurst shifter. Hardtop, 6spd, cloth interior complete the built for speed order. SOM color is icing on the cake So anything I do to this thing must be reversible. My pops has a stash of original low mileage 60-70's muscle cars - so I got the same thing in mind about this car 30 years from now! So I keep the thing spotless....
But don't get me wrong I steal beat on it like I stole it and mod the crap of it

 

these CNC LS6 heads are milled down .055 ", so you would probably need 7.350" pushrods.

you can get these heads for $951 each at Paceparts.com

 

Okay finally some feedback on pushrods
Now what about the intake match since the heads are milled?? Do the ports line up-does the intake need to be port matched??
What's so special about Cartek's process that allows them to port the fiber reinforced plastic intake?
Thanks gents