Mr. B

iTrader: (1)

I will have two sets of heads for my Formula, which will be set up strictly for the track. Forged 346 w/TH400, which will also see two stages of N20.

The heads are TEA's Stage 2.5 5.3L N20 "Hand Finished" heads, which will go up against the new CNC'ed AFR 205 66cc heads. Both sets will be flowed on the same bench, by the same person. Both sets are new (TEA's have just 2 or 3 Dyno's)- AFR's are out of the box. Both sets are roughly the same price- with the AFR's costing slightly more. The better performing heads will obviously win the rights to go on my car.. the runner-up's will not.

Anyone care to predict the outcome???

Too bad I didn't keep the PP LS6 "style" heads and AS Stage 2 CNC heads.. this coulda been like Consumer Reports.

TILEMAN

I'd say AFR, but could the hand finish give the TEAs an advantage?

ls1hybrid

i have totally lost faith in afr's out of the box. they are nothing until they get milled. stock for stock i think TEA's 2.5 will win.

LEO

iTrader: (3)

Tea 2.5

offaxis

iTrader: (19)

Great Idea bob

I have my AS heads off my car right now with 15,000 miles on them if ya want to toss them into the mix. I wouldnt mind alittle independant testing.

Ben R

Hard to say without the specs on all of the heads being tested. It would also be nice to get a list of bolt-on modifications and camshaft selection.

offaxis

iTrader: (19)

Im sure we can get someone with a set of patriots to do this also. We can have a real world test. I have 6.0 heads but my friend has a set of AS 5.3 heads off his car now and i am sure he would do it.

pdd

iTrader: (3)

I AGREE

Ben R

Care to explain why you think the AFR's aren't any good? Because 1 car didn't make good power they're not good heads? You gotta give things time to get worked out.

MUSTANGEATER

iTrader: (10)

I am not sure on the CNC porting of the AFR's however I am waiting to see/hear more results, I think its a very good head especially for the money.. I am almost positive the Afr's are a better casting, than the 5.3's or LS6's. I'm still looking around for the best head for my new build but eventually I'll find it.

ls1hybrid

explaination: lost faith in afr's ability to make power stock! the afr's are better castings but their combustion chambers are too big to compete with other heads with 59cc combustiuon chambers. I think the test involves bolting on each head (without work(as they come from each company)). If so, i think the TEA heads will win.

King, the heads you've got are milled, therefore you should see some godly power!

On a side note, dont make me make you change your name to KingBox. (jk)

On a side side note, ide love to see the results in a comparitive graph displaying the torque curve of each head plz.

-peace-

WS-Sick

pdd, do you plan on getting yours hand finished?

Ben R

Did you forget about velocity? The small ports of the AFR head produce not only great CFM numbers, but also great air speed, increasing torque.

If you're saying my heads are milled, why don't you go have yours milled to bump compression? It's not that expensive....

ls1hybrid

i admit defeat

good kill

i love you

pdd

iTrader: (3)

i was gonna but i didnt want to spend another 600bucks and i didnt deck my heads becasue i didnt want to flycut

MelloYellow

The AFR's have great low-end and mid-range Torque/port velocity. Not sure if they are intended to be compared to hogged out max flow .600 lift heads out of the box.

225's or custom CNC'd 205's will be the High-Lift Max flow Dyno Queen vs. Street TQ setup.

If you want above average high lift flow and best available low and mid range power, they are awesome heads. Not to mention other advantages in design, thicker deck for FI, etc... TEA makes great heads too, but I think some are missing the point of the out of the box AFR 205's.

I don't have great direct head to head comparisons, but I believe I picked up 25rwtq peak with the AFR's vs. CNC'd LQ9's. I max'd out my S-Trim on the top end and am overspinning the blower at 54,000 rpm now, so I don't have good rwhp top end data yet. Need to upgrade to a T-Trim. But the TQ improvement was notable.

I should see the CNC LQ9 vs. AFR comparison dynograph powerband printout tomorrow. Was told there was an across the powerband gain at low and mid RPM. Upper range power was the same as the CNC'd LQ9's, but again hit the blower rpm/flow restriction at 6000 engine rpm.

Scalpel

iTrader: (4)

TEA's will pimp slap those heads.

gomer

iTrader: (13)

Out of the box AFR 205's will not touch the TEA 2.5's... that's like comparing a stock car to one with mods. IMO... It would take another $1,000 to get the 205's to the same point as the TEA 2.5's if they are done correctly.

PREDATOR-Z

Why do poeple insist on comparing lower compression, out of box AFR's to Fully machined hand finished stage II heads and then say they're bad or not good enough??
Give the same treatment to the AFR's and then compare.
AFR 205's are not "race" heads out of box. They're meant to compete against LS6 castings and do blow them away.
AFR 205's are "street" heads and the 225's are more big cam/stroker material.
You are comparing heads that have nothing in common except them being heads.
Look at the specs, and unless you are blind, surely one can see the difference.

gomer

iTrader: (13)

Because they cost the same amount of money????
I was as horny as the next person about these heads when they were announced, but like I've said.. for the freaking money they cost I can do something better than drop 2grand on them and then spend another $1,000 to make them better than some stage 2.5 5.3 heads.

A set of out of the box afr's cost the same amount as a tricked out set of 5.3's. That's a FACT and that is really going to hurt these heads That's why people compare them to each other