VICOUS

Hello

I currently have a 2004 Z06 with the G5X3 cam. I am getting ready to do heads in the next month along with the FAST 90 and TB. I want to know should I go with the AFR 205cc or wait for the AFR 225. I plan on keep the stock cubes 346.

Please share your thoughts along with with size chamber I should go with.

Thanks

PREDATOR-Z

AFR 225 62cc (will have to flycut)
or
AFR 205's ported to match cam specs, could be mildly milled (no flycut) or milled for a 11.2:1 CR (flycut needed)

InsomZ

iTrader: (1)

i'm waiting to hear reviews of customers for daily driving.(so that'll be a while) i'm planning the same setup.. 205 or 225

Watch22

I'm waiting on the AFR's or Stage II PP LS6 Heads with a 224/244 .581 114 cam or a 224/228. I already have long tubes and full intake mods. I'm hoping to put down close to 450RWHP.

mdhmi

iTrader: (1)

I'd wait to hear the results on the 225's - thus far they really look superior to the 205's.

Cheers,

Mark

wallstAL

NataSS Inc

iTrader: (9)

Think of the 225's as a MAX effort set of heads. If your trying to squeeze every last ounce of HP out of the motor you want the 225's.

PewterZ28

iTrader: (1)

Will the AFR 225 62cc heads work well on a 383 ci motor?

NataSS Inc

iTrader: (9)

yes. Max effort stock ci and big ci motors is what they were made for.

PewterZ28

iTrader: (1)

For stock cubes would you say it is best to use the 225's as they come out of the box rather than have a porter hand finish them?

NataSS Inc

iTrader: (9)

dont know yet. There isnt enough real world data to make any conclusions from. Only a couple of shops have had a chance to use these. LG motorsport made a monster with just a spring upgrade to the head to support thier cam. Other than that, they were box stock.

One thing you wont want to do is mill the heads though. I spoke with Tony yesterday and he said that milling the snot out of them would hurt more than help by reducing airflow. Make it up with a domed piston instead.

I am sure some touch up work wouldnt hurt them but from what I have read, they seem to do fine as is.

PewterZ28

iTrader: (1)

Thanks for the info.

I'm curious, what application did LG use the 225's for? Was it a 346ci N/A motor? N20 application?

NataSS Inc

iTrader: (9)

346 N/A With a HUGE cam.

smask04C5

iTrader: (1)

vicous, 225's are not necessary for stock cubes. go with 205's with 62cc chamber. velocity will fall off with 225's.

Tony Mamo @ AFR

iTrader: (13)

Guys...

225's ARE OK for stock cubes...perfect for a "more aggressive" H/C combination.

Also, to further clarify, the big cammed high HP 346 that LG ran 140 MPH in the quarter had a set of 205's!!.....NOT 225's.

I have posted numerous times about the benefits of a 225 on a stock displacement engine etc....I don't have the time now but if someone can search and perhaps post a link to the thread I speak in detail about which head is best...a 205 or a 225, I think it will answer alot of your questions. (I've hit this topic already in multiple threads....JRP....where are you when I need you!!....LOL)

In about a month I should have results from my car with the 225's and a slightly bigger bumpstick...that will show some of the larger 225's potential....sit tight for a little while longer.

Thanks,
Tony

PS The same "high velocity" principles have still been incorporated into the AFR 225 port design....Look at it like a 205 on steroids. The 225's will not make as much low RPM part throttle power like some of you guys are experiencing with the 205's, and probably will not help fuel economy as much, but the 225's will shine once the tach starts swinging past 4000 RPM's. At WOT, there might be very little difference between the same combination with a 205 under 4000 RPM's, but the higher the tach swings from there, the larger the delta in power will become with the larger, higher flowing, 225's. The 205 on a stock displacement shortblock is a GREAT street/strip head.....the 225 on a stock displacement shortblock will be a GREAT strip/street head. The question you have to ask yourself is where do you want to place YOUR emphasis on. If your looking at cams over 230' @ .050, my guess is you should be looking more closely at the 225's.

smask04C5

iTrader: (1)

tony, then would you suggest 205's for a stock bottom A4 C5 with many bolt-on's? going to install a VHP Boss II .551 216/224 w/ 2800 yank. have donaldson, crane1.8 w/springs, dynatech and magnaflow. VHP tuner 351 rwhp/360ft#tq looking for heads!

pdd

iTrader: (3)

if you a g5x3 cam, thats pretty much a max effort cam. you mine as well go with the max effort 225 heads

PewterZ28

iTrader: (1)

Tony,

Thanks for the clarification on the 205's vs. the 62cc 225's.

Is it true you shouldn't mill the 225's? Just curious because I'm looking for a compression ratio around 11.2:1 ~ 11.5:1 and I'm just wondering how I'm going to get there if the 225's can't be milled.

Thanks,

Derrick

Damage Inc.

iTrader: (7)

TTT for the milling.

PREDATOR-Z

pistons ?