02sleeperz28

iTrader: (26)

Very nice.

nysbadmk8

Doubtful, If those same people purchased better heads they could realize the same gains, also the curve on a bigger cube engine should be better in "most cases"

But 500 rwhp Auto 6.0's is nice.. but DYNO'S are DYNO'S

Awesome work from AFR/ Pat g on pushing LS technology even further

ScreaminRedZ

iTrader: (3)

Damn, those are some crazy numbers, very badass! How does it feel compared to your WS6?

1c62nv

iTrader: (3)

Welcome back to the 500+ club

Patrick G

iTrader: (14)

Here's an idle clip. Sorry for the wind noise and mud on the car. We are having a tropical storm blowing through today and I just caught a break to record this.
http://www.youtube.com/watch?v=dqbUSQAEmaY

algws6

iTrader: (3)

nice work. it even sound more stealth than mine!!!

Tony Mamo @ AFR

iTrader: (13)

That sounds as stealthy as the 224/228 cam in a 346....hell, it might even be cleaner....LOL

You roll up with that and pull another reasonably quick car down on the street and for sure he will be looking for the hidden nitrous system....without a doubt.

Thats a cool ride.....it could only be better if it were silver or white (a more "understated" color) for even more "stealth".

Its nice when you actually get more than you were hoping for....in this industry it just doesnt happen very often!

To the poster that inquired about these heads on a 346 I would say it would have to be very aggressive.....lightwight everything for a 7300-7400 minimum shiftpoint or you wouldnt take full advantage.

A 346 with a solid roller and a 7800-8000 RPM set-up with these heads would be a very powerful combo....now were talking!



-Tony

NemeSS

iTrader: (127)

very impressive.

8ByGoat

iTrader: (2)

Disclaimer-not busting your *****-sick car sick results-but got to play devil's advocate for a second based on the way the title of the thread reads....

I would love to know what the actually gains were from the head and intake swap. Let's be honest a majority of the gain was going from not cammed to cammed. Some of the gain was going from a FAST 102 that works from a FAST 102 that doesn't and whatever was left over could be attributed to the head swap.

Patrick G

iTrader: (14)

Those are valid points. My math says that the AFR heads were worth 35-40rwhp over the L92 heads. Here's how I arrived at that number.

Most 230 at .050" cams added to an L92 headed 6.0 add 60-70rwhp. But my car with L92 heads had previously gained 13rwhp with the Yella Terra 1.85 rockers so I already had a 13rwhp head start on the 60-70rwhp gain people typically see with 230 @ .050" cam swaps (so the cam gains were more like 47-57rwhp). My new combo runs stock 1.7 ratio LS2 rockers. Tony's FAST 102 porting typically adds 7-10rwhp. My L76 already had the FAST 102 on it before.

So there's the math: Heads +35-40rwhp. Cam +57rwhp, Tony's intake porting +7-10rwhp = 105ish gain. I have not seen anybody's CNC L92 heads gain 35-40rwhp over stock L92 heads in a 6.0L, regardless of cam. Remember, the 4.0" bore of our 6.0L engine shrouds the 2.16 intake valves and hurts their flow potential. A 6.2L with its bigger bore is happier with L92s but it's still not great.

AINT SKEERED

iTrader: (2)

Patrick, the Fast truck intake you speak of is it better then the car intakes? I can fit it on my Nova and thinking it may be worth the extra coin when i pull the trigger. I actually was thinking of the LSxR intake from Edelbrock but no one really post anything from it.
THat leads me to think it flopped.

Patrick G

iTrader: (14)

According to Rich Smith at Comp, their FAST 102 Truck intake is their very best race intake for EFI applications. He says it's even better than the regular 102. The shot into the head is straighter, the plenum is bigger, and the flow is even better. If you have hood clearance, it's the intake to run for Cathedral Port heads.

69LT1Bird

iTrader: (1)

Great numbers Patrick.

So for a head for head comparison, same cam, Mamo intake etc. If you used the best LS3/L92 CNC's heads vs these AFR 230 V2's it would be 10-15 horsepower difference?

Just trying to figure the math. I am looking at the cost difference of the AFR's and stock CNC'd for reference.

jamminj007

iTrader: (6)

Wow you made a believer out of me! Congrats! Now do yoou want to sell me your Yella terras?

Patrick G

iTrader: (14)

In my opinion, the gains would be more. I have yet to see a ported CNC L92 head gain more than 20rwhp on 6.0L. Most gain less than 10 (seriously). On a larger bore 6.2L, the gains might be more, but it's tough to get more than 10-20rwhp gain on a 4.0" bore.

Think about it...the L92 heads already start off as a 260cc head. The CNC versions are even bigger than that. The airspeed (velocity) going into the cylinder head suffers and power flat-lines. More flow doesn't always equal more power. If it did, you'd see lots more L92 headed strokers making power like the Trick Flow 235s (and now AFR 230 v2s). Nobody disputes the power a TFS 235 makes on a 402-418. They make anywhere from 525-575rwhp. But it's rare to find an L92 head making the same power on a 402-418.

Want something harder? Try making big power on a 6.0L with L92 heads. Yes, they're great stock, but the better cathedral heads still smoke it, regardless of their vaunted flow numbers.

8ByGoat

iTrader: (2)

With regards to the first two paragraphs above they are true. I have said it for years, CNC versions if anything, hurt performance on stock cubed LS2's. Mine are touched up on the exhaust side, bowls blended, and milled.

The last paragraph, well.........

8ByGoat

iTrader: (2)

I just don't think I could swap my heads, and ported stock L76 intake, bolt on these heads and mamofied 102 and make over 500. I also think the gains are greater when comparing LS2 "style" intake vs mamofied FAST102 vs LS3 style intake vs mamofied FAST 102.

I am actually thinking about replacing my top end (reason why I am in here and playing devils advocate LOL).

SOMbitch

iTrader: (8)

VERY IMPRESSIVE

I knew those heads were gonna be sick but I wasn't expecting this much Awesome work Tony

Congrats Patrick

bozzhawg

These are pretty strong claims since guys have been making power with the L92 230/230 and 230/234 490HP+......

So pound for pound and it comes down to $$$$$$$$$$$

If it holds true that this 1 dyno test will out perform several L92 combo's

and we go by your data that this combo 6.0/AFR 230 makes a 105HP gain vs the 6.0/L92 Combo= 75 HP gain

Then for 20-30 extra HP it will cost ya $2000?

every HP gain after the 6.0/L92 475rwhp will cost ya $66-$100 per HP?


Can we agree on this?

gnx7

iTrader: (28)

insane n/a power! 500rwhp daily driven automatic 6.0 cars.