AFR Heads

flamed 98 gt · June 18th, 2008, 02:08 PM

For a car that is not a dd would you put the 225 heads on it? It still has the stock bottom end. But will be going to a 408 some time in the future. Sorry this is on my 90 5.0.

blue90lx · June 18th, 2008, 02:29 PM

I wouldn't put them on stock 5.0. But if you get them for the 408 they should be fine. I had a buddy that was runnin a 408 with a 205 afr head and first pass off the trailer on motor he ran 10.90.

ryans88gt · June 18th, 2008, 02:41 PM

205s will work with a otherwise stock motor (you'll obviously be wanting an intake). You may need to clearance the pistons, not sure with the stock cam, but the valves will be bigger than the reliefs.

flamed 98 gt · June 18th, 2008, 03:15 PM

Running a TFS stage 1 cam.

r.barn · June 18th, 2008, 04:32 PM

waste of money and will be a dog down low.
Just wait to put them on your 408

ryans88gt · June 18th, 2008, 04:52 PM

People said the same thing about using 265cc 4V cleveland heads on a 351w. But, in actuality it gives up nothing down low.

r.barn · June 18th, 2008, 06:44 PM

thats different.

You will loose a lot of intake runner velocity with those 205's on a 302
with a small cam.

You may make good power up top, but your avg. hp over the entire
power band will not be as good.

You can run big heads on 302, but it requires the right cam and power band.

JBIGBOOTSY · June 18th, 2008, 07:27 PM

Originally Posted by r.barn

thats different.

You will loose a lot of intake runner velocity with those 205's on a 302
with a small cam.

You may make good power up top, but your avg. hp over the entire
power band will not be as good.

You can run big heads on 302, but it requires the right cam and power band.

I have 210cc runners, and it has lost nothing "down low", on the contrary I can promise I have made gains under 3000rpms.

r.barn · June 18th, 2008, 07:40 PM

Originally Posted by JBIGBOOTSY

I have 210cc runners, and it has lost nothing "down low", on the contrary I can promise I have made gains under 3000rpms.

I bet you're not running a TFS-1 cam either ...................

Darrell · June 18th, 2008, 07:56 PM

Originally Posted by r.barn

thats different.

You will loose a lot of intake runner velocity with those 205's on a 302
with a small cam.

You may make good power up top, but your avg. hp over the entire
power band will not be as good.

You can run big heads on 302, but it requires the right cam and power band.

How is it different?

It doesn't matter what head you run as long as the rest of the pieces of the total combination match the heads. However, by the sounds of this scenario he is wanting to put 225 heads with 2.08 intake valves on a stock engine which I wouldn't do. For one the valve pockets will need to be cut for the bigger valves and for two the car will be an absolute turd. Not to mention all of the money involved in making the swap (gaskets, rockers, pushrods, head bolts, etc.). Waste of time and money on a 5 liter.

r.barn · June 18th, 2008, 08:25 PM

Like I said, waste of money

and Like I said ...... they will work ...... as long as the cam and power band match

JBIGBOOTSY · June 18th, 2008, 10:08 PM

Originally Posted by r.barn

I bet you're not running a TFS-1 cam either ...................

F cam

ryans88gt · June 19th, 2008, 12:30 PM

Big runners do not hurt low power numbers and 225cc runners are definitely not big. You just need the rpm to use them. The gains on the top end almost always outweigh the losses on the bottom end. You just need to be careful choosing a cam shaft that meets your needs. Running a large cam will hurt low end power way more than running a big cc head. And AFR has done its research, the 225 cc ports are not lazy ports even on a 302, but to use them to maximum potential you'll need to see the high side of 7500 rpms.

trueblue01 · June 19th, 2008, 12:47 PM

Seems that he wants to buy heads and use them on his stock engine until he can up grade to "the" engine (408). Obviously clearances have to be considered with regard to valves and pistons. The engine will function with the 225s it's just not going to be the optimum combination. Depending on what the actual time frame will be for the new engine, hunting up a decent set of used heads that will match the current engine might be a little wiser. Barring any kind of damage to the "used" heads, recouping his investment from the heads would be fairly easy. The best laid plans of mice and men always seem to miss the mark.

baine21225 · June 19th, 2008, 03:45 PM

i think your best bet is finding a set of used gt-40 (gt-40p) heads until the time that you upgrade the engine, because you can usually sell the used parts for what you paid for them in the first place, then just take that money and put it toward your new aluminum wonders

flamed 98 gt · June 19th, 2008, 06:32 PM

Right now I am running 351w heads that have been ported and polished along with a valve job. But I was told these are doing nothing for me.

ryans88gt · June 19th, 2008, 06:41 PM

ported DO heads are probably as good as GT-40 heads.

flamed 98 gt · June 19th, 2008, 07:23 PM

how do you tell?

June 18th, 2008, 02:08 PM	#1
flamed 98 gt Regular Join Date: Sep 2006 Posts: 193	AFR Heads For a car that is not a dd would you put the 225 heads on it? It still has the stock bottom end. But will be going to a 408 some time in the future. Sorry this is on my 90 5.0. Last edited by flamed 98 gt : June 18th, 2008 at 02:15 PM.

June 18th, 2008, 02:29 PM	#2
blue90lx Regular 90 lx hatch 13.02@103.62 Join Date: Mar 2008 Location: Albertville, Alabama Posts: 123	I wouldn't put them on stock 5.0. But if you get them for the 408 they should be fine. I had a buddy that was runnin a 408 with a 205 afr head and first pass off the trailer on motor he ran 10.90. __________________ to many parts and money to be so slow F/S 1986 mustang vert asking $6500 http://www.moddedmustangs.com/forums...ml#post1277818

June 18th, 2008, 02:41 PM	#3
ryans88gt MM Fanatic Join Date: May 2007 Location: Bloomington, IL Posts: 3,768	205s will work with a otherwise stock motor (you'll obviously be wanting an intake). You may need to clearance the pistons, not sure with the stock cam, but the valves will be bigger than the reliefs. __________________ 89 LX 515 hp 497 ftlbs 11.3 @ 125 mph 88 GT 11.4 @ 118

June 18th, 2008, 04:32 PM	#5
r.barn Regular 1989 LX Vert - 1993 Notch Fast Join Date: May 2008 Location: Houston Posts: 346	waste of money and will be a dog down low. Just wait to put them on your 408 __________________ The last President elected in anger of previous President was ....... Jimmy Carter God Help Us

June 18th, 2008, 04:52 PM	#6
ryans88gt MM Fanatic Join Date: May 2007 Location: Bloomington, IL Posts: 3,768	People said the same thing about using 265cc 4V cleveland heads on a 351w. But, in actuality it gives up nothing down low. __________________ 89 LX 515 hp 497 ftlbs 11.3 @ 125 mph 88 GT 11.4 @ 118

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June 18th, 2008, 03:15 PM	#4
flamed 98 gt Regular Join Date: Sep 2006 Posts: 193	Running a TFS stage 1 cam.

June 18th, 2008, 06:44 PM	#7
r.barn Regular 1989 LX Vert - 1993 Notch Fast Join Date: May 2008 Location: Houston Posts: 346	thats different. You will loose a lot of intake runner velocity with those 205's on a 302 with a small cam. You may make good power up top, but your avg. hp over the entire power band will not be as good. You can run big heads on 302, but it requires the right cam and power band. __________________ The last President elected in anger of previous President was ....... Jimmy Carter God Help Us

June 18th, 2008, 08:25 PM	#11
r.barn Regular 1989 LX Vert - 1993 Notch Fast Join Date: May 2008 Location: Houston Posts: 346	Like I said, waste of money and Like I said ...... they will work ...... as long as the cam and power band match __________________ The last President elected in anger of previous President was ....... Jimmy Carter God Help Us

June 19th, 2008, 12:30 PM	#13
ryans88gt MM Fanatic Join Date: May 2007 Location: Bloomington, IL Posts: 3,768	Big runners do not hurt low power numbers and 225cc runners are definitely not big. You just need the rpm to use them. The gains on the top end almost always outweigh the losses on the bottom end. You just need to be careful choosing a cam shaft that meets your needs. Running a large cam will hurt low end power way more than running a big cc head. And AFR has done its research, the 225 cc ports are not lazy ports even on a 302, but to use them to maximum potential you'll need to see the high side of 7500 rpms. __________________ 89 LX 515 hp 497 ftlbs 11.3 @ 125 mph 88 GT 11.4 @ 118

June 19th, 2008, 12:47 PM	#14
trueblue01 Enthusiast 1989 Mustang LX 10.98@126.7 NA Join Date: Feb 2008 Location: N.E. Ohio Posts: 659	Seems that he wants to buy heads and use them on his stock engine until he can up grade to "the" engine (408). Obviously clearances have to be considered with regard to valves and pistons. The engine will function with the 225s it's just not going to be the optimum combination. Depending on what the actual time frame will be for the new engine, hunting up a decent set of used heads that will match the current engine might be a little wiser. Barring any kind of damage to the "used" heads, recouping his investment from the heads would be fairly easy. The best laid plans of mice and men always seem to miss the mark. __________________ Never fast enough.

June 19th, 2008, 03:45 PM	#15
baine21225 Hardcore Enthusiast Join Date: Jun 2007 Location: Baltimore, MD Posts: 1,951	i think your best bet is finding a set of used gt-40 (gt-40p) heads until the time that you upgrade the engine, because you can usually sell the used parts for what you paid for them in the first place, then just take that money and put it toward your new aluminum wonders

June 19th, 2008, 06:32 PM	#16
flamed 98 gt Regular Join Date: Sep 2006 Posts: 193	Right now I am running 351w heads that have been ported and polished along with a valve job. But I was told these are doing nothing for me.

June 19th, 2008, 06:41 PM	#17
ryans88gt MM Fanatic Join Date: May 2007 Location: Bloomington, IL Posts: 3,768	ported DO heads are probably as good as GT-40 heads. __________________ 89 LX 515 hp 497 ftlbs 11.3 @ 125 mph 88 GT 11.4 @ 118

June 19th, 2008, 07:23 PM	#18
flamed 98 gt Regular Join Date: Sep 2006 Posts: 193	how do you tell?

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