Holy Moly! 485 rwhp with G5X3 and AFR heads!

[jub jub]

I hope it's OK to cross link!

http://www.ls1tech.com/forums/showth...56#post1439056

I'm sure Lou will be in here soon to talk up these heads!

[2002Z06Yellow]

the AFR results are average. just like an LS6 stage II head.

[Z06Godfather]

those numbers are starting to spark my interest!!!

540 hp out of a stock bottom without a supercharger, that is amazing.

[CraZee ZO6]

Those are some Sweet numbers.

[TexasBlue72]

I think we need to hear more on this. Jub jub---do you know the specs on that cam? Lou? Oh Lou?

[vortech]

Not inpressed just yet-those heads were not out of the box AFR heads eithier. They had 59c chambers and better springs-which means they cost more than the $2300. I think a better comparison would of been to run the AFR heads with the 66cc chambers they come with. Most G5X3's make around 425-430 without an intake. I would like to see "stock" AFR heads on a combo like that-then upgrade to an intake and then see what u gain. Don't forget LG also made 460RWHP with the G5X3 on a 112 with the LS6 intake and TPIS wide mouth TB. I think a few more cars need to try them just yet.

[jub jub]

Originally Posted by vortech

Not inpressed just yet-those heads were not out of the box AFR heads eithier. They had 59c chambers and better springs-which means they cost more than the $2300. I think a better comparison would of been to run the AFR heads with the 66cc chambers they come with. Most G5X3's make around 425-430 without an intake. I would like to see "stock" AFR heads on a combo like that-then upgrade to an intake and then see what u gain. Don't forget LG also made 460RWHP with the G5X3 on a 112 with the LS6 intake and TPIS wide mouth TB. I think a few more cars need to try them just yet.

Seems like a nice gain though. I will be watching this closely as the actual results begin to trickle in.

[JBsZ06]

Seems like someone is going to try just swapping the heads on the 2002 and newer Z06 to get how much of an improvement?

These heads are 2182 dollars..with dual springs rated up to .600 lift. (if you want springs rated above .600 lift add 80 dollars...) and these heads tested had the $100 option to raise the compression ratio to 11.25 which is fine for 93 octane. so the full cost of these heads giving an extra 40rwhp and 23 lb/ft of torque over ls6 heads is? 2362 dollars..

Thats pretty impressive with the G3X5 cam.

Will it be 30rwhp and15lb/ft of torque on a stock 2002 and newer Z06 with stock cam? for 1700 net cost after selling stock ls6 heads for about 800 ? figuring 300 in labor? (thats over and above a Z06 that has headers already?)

For those with headers it might just happen...

and the worst case scenerio you could figure to just drop an aftermarket cam in if it doesn't happen. Depending on cam it sounds like the power of the new built motor with cam should range between 440-450 rwhp (224/224 cam) and 485rwhp with the LG G3X5 cam. Just make the decision on which cam you would go with so you order the springs according before hand.

I seem to remember a lot of people asking this question about just swapping heads and leaving the cam stock.