Tony Mamo @ AFR

iTrader: (13)

Guys...

Quite a few of you have been inquiring about the 225 flow data on the smaller 4' bore (only had a 4.030) and the results were even better than I could have hoped for.

This is a "production" 225 we just pulled off one of the new CNC porting machines we have been working on getting up and running.

Here are the numbers....

Bore Size....200....300....400....500....550....600

4.125.........152....221....270....307....316....3 23
4.030.........150....219....268....306....316....3 24

What's really interesting is the slight gain in peak flow...conventional wisdom would lead you to believe the larger unshrouded bore would always be stronger....With this chamber, valvejob, and port shape it obviously wasn't the case. Also, to only lose a couple of CFM downstairs was very surprising when you consider how much more the valve is shrouded. The few results we have seen already with some 402/408 builds have been very strong and these numbers certainly support those results.

Tony M.

Patrick G

iTrader: (14)

Very good flow numbers. Nice to know that EVERYBODY who owns a set of 225s will have flow numbers this good.

jrp

iTrader: (16)

good stuff Tony. whats the ETA on the 402/408 build up?

Slowhawk

iTrader: (12)

We used the AFR225's on a 408 and the results were awesome Nevermind all the Supercharged 600+ hp AFR 205 cars we've done lately,all of them are 100% emmision legal

DrkPhx

iTrader: (15)

This alone is worth the price of admission. I have seen two different sets of AFR's and the CNC job on them is absolutely fantastic, but more importantly consistent. The attention to detail is very apparent when examining these heads.

FWIW - AFR uses their premium fine cut CNC on theLS1 heads which is evident by looking at the actual CNC ridges that are closer together than a standard rough cut CNC used by other vendors. Flow difference between to the two is said to be worth a few more CFM's.

verbs

great #s tony!

Tony Mamo @ AFR

iTrader: (13)

There has been a few threads of late about why heads are so expensive, yada, yada, yada....and like most things in life you usually get what you pay for (not ALL the time unfortunately). One of the reasons the AFR's cost what they do is the time it takes a VERY expensive CNC machine to port them. Even with newer, state of the art, faster equipment, due to the much finer levels we set our CNC machines to run (on the entire LS program as well as our "competition" std. SBC stuff), it takes almost 4 hours per cylinder head JUST to CNC port the chamber, intake, and exhaust ports....this doesnt take into account all the other time it has spent on other machines going thru the shop just to be a machined casting ready to be CNC ported. If we ran our LS heads at a more typical step over level (.060 lets say), we could save 50% less porting time....think about how much money that could save a production shop like AFR in a given month.....BIG numbers. The benefit to the finer program for the end user is numerous....better duplication of the port it was copied from due to less tool deflection from removing alot less material for every "pass" of the CNC and more resolution as well....critical in areas like the short turn and other locations where the airspeed is high and any change in shape could potentially hurt you (flow wise). Also, the finish is much smoother to the touch and requires no hand sanding to achieve a smoother surface. The bottom line is the heads flow more that way, are more consistent, and aesthetically they look KILLER. Its always nice to bolt on a speed part that actually "looks the part" as well.

Anyway...just thought I would take the oppurtunity to discuss this openly. Its a topic I really never spent much time on and I didnt participate in the other thread at all regarding costs of cylinder heads etc. I know Ive said this before, but the LS cylinder heads are definately our "latest and greatest" and really show the constant refinement in the products we manufacture....if your considering purchasing a set, one trip to a shop that could show you them would be all you needed to probably put you over the edge. I keep promising myself I will take some high res digitals of the new 225's, but never seem to find the time...hopefully I can make that happen sooner than later.

Regards,
Tony

LeMansBlue04

I do not think that the AFR heads are out of line with what you get for your money. Before the AFR heads came out the only way to even get close (and you couldn't really) to the performancel levels AFR offers was to go to someone like Lingenfelter and get a re-worked set of LS6 heads. The prices for reworked LS6 heads from a machine shop of that caliber start, start mind you, at $1800.

Then you must supply a core, so, add another $800 or $900 if you don't have a core. Since F-Bodies don't you gotta find a LS6 core off of a Vette. That means your'e sneaking up on $3000. The AFR 205's can be had for about $2200 and you can sell your existing heads to recoup some of the cost. If you have LS1 heads you can sell them for at least $200.

AFR 205 heads for a total out of pocket cost of $2000 plus shipping compared to almost $3000 for a comprable set of reworked LS6 heads? Sounds like a solid deal to me. And don't even approach me with an argument about the cost of PP heads. I wouldn't put those on a station wagon. You have not seen the kind of failures PP has with the top of the line suppliers of heads.

YOU GET WHAT YOU PAY FOR and...
If you don't do it right the first time you get to pay for it AGAIN.

01_SuperSlow

iTrader: (7)