Are AFR heads worth the extra $$$$
Good luck to you, Bro. Seriously.
Just because I'm a "newbie" means I can't ask a question without getting flamed? Whatever.
Have a good evening and good luck with your car...
Sorry if I offended you by asking a question...
Back to helping the OP now, I hope.
Rossi
Just because I'm a "newbie" means I can't ask a question without getting flamed? Whatever.
Have a good evening and good luck with your car...
Sorry if I offended you by asking a question...
Back to helping the OP now, I hope.
Rossi
if the afr are close to the orignal price used, might as well just pay the extra and get new ones from the manufacturer. i would and have purchased a new set of afr's. and would again if going max effort forced induction.
but my car has no prob puttin down just under 500 n/a with upgraded 243 oe castings
but my car has no prob puttin down just under 500 n/a with upgraded 243 oe castings
I would be happy to provide both cylinder heads for testing on our engine dyno, you can look at the data & choose whichever cylinder heads you feel makes the best power for your budget. I've done this testing before & I think you'll be very happy with the PRC heads. That being said I always welcome the opportunity to test & show off products to the end users!!
__________________
Jason
Co-Owner, Texas Speed & Performance, Ltd.
2005 Twin Turbo C6
404cid Stroker, 67mm Twins
994rwhp/902lb ft @ 22 psi (mustang dyno) www.Texas-Speed.com
Jason
Co-Owner, Texas Speed & Performance, Ltd.
2005 Twin Turbo C6
404cid Stroker, 67mm Twins
994rwhp/902lb ft @ 22 psi (mustang dyno) www.Texas-Speed.com
If you have to pass emissions, AFRs are the only ones I know of with a CARB/OE number. Many will pass the sniffer with the right cam and tuning.
Also keep in mind to judge based on average/under the curve power and throttle response. AFRs are better, without a doubt. They typically make a tad more power, a bit more torque but noticeably more average power. Also, the throttle response and low end tends to be outstanding due to the small runners. This is harder to see on a dyno but you DO feel it in the car. Are they worth the extra dollars? That depends on your priorities and budget.
If all you care about are the biggest peak numbers, you probably won't judge it worthwhile.
Also keep in mind to judge based on average/under the curve power and throttle response. AFRs are better, without a doubt. They typically make a tad more power, a bit more torque but noticeably more average power. Also, the throttle response and low end tends to be outstanding due to the small runners. This is harder to see on a dyno but you DO feel it in the car. Are they worth the extra dollars? That depends on your priorities and budget.
If all you care about are the biggest peak numbers, you probably won't judge it worthwhile.
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Verdad Gallardo I would be happy to provide both cylinder heads for testing on our engine dyno, you can look at the data & choose whichever cylinder heads you feel makes the best power for your budget. I've done this testing before & I think you'll be very happy with the PRC heads. That being said I always welcome the opportunity to test & show off products to the end users!!
TECH Resident
Joined: Sep 2003
Posts: 848
Likes: 1
From: Working in the shop 24/7
OP... buy the AFR heads... proven time and time again to make great, reliable power.
Dyno numbers always help, here are the experiences I had with my AFR 205's...
So, I got mine for a "killer" deal
I paid $1750 for brand new LGM milled 59cc chamber heads.
First setup-- AFR's, TR(?) 224R .581/.581 112LSA, LS6 Intake, bolt-on's..... 410rwhp/393rwtq
Next-- AFR's, G5X3, LS6 intake, bolt-on's.... 433/410 (BTW! don't do this, I dropped a valve)
Now-- Ported 205's, 238/240 .605/.609 113LSA, Ported 90/92... waiting on numbers
You can listen to everyone, TFS 215's are bigger (duh, the number) but with heads, from what I have found is that, port air velocity is a big deal too. And correct me if I'm wrong but the port velocity technology with the AFR's is at the top of the league...
I like them, a lot, $2300 a lot? I dunno about that... But there are the numbers that hopefully will help.
BTW, my car is auto...
So, I got mine for a "killer" deal
I paid $1750 for brand new LGM milled 59cc chamber heads.First setup-- AFR's, TR(?) 224R .581/.581 112LSA, LS6 Intake, bolt-on's..... 410rwhp/393rwtq
Next-- AFR's, G5X3, LS6 intake, bolt-on's.... 433/410 (BTW! don't do this, I dropped a valve)
Now-- Ported 205's, 238/240 .605/.609 113LSA, Ported 90/92... waiting on numbers
You can listen to everyone, TFS 215's are bigger (duh, the number) but with heads, from what I have found is that, port air velocity is a big deal too. And correct me if I'm wrong but the port velocity technology with the AFR's is at the top of the league...
I like them, a lot, $2300 a lot? I dunno about that... But there are the numbers that hopefully will help.
BTW, my car is auto...
Heres my experience with MS3 cam,TSP stage 2.5, 5.3 heads and fast intake. I put down 433 HP on a Mustang dyno.On a dyno jet add 25 hp minimum,so that would be 458 hp through an automatic.Making good numbers is more than just bolting parts together.Take the time to install things correctly,and check things after and during the install.Do the AFR heads make more power,probably a little bit.If any sponsors would like to send me a pair to do an A-B comparrison i would be more than happy to try them and have it redynoed. Im happy with the heads i have on now.
Stage 1 and stage 2 LS6 heads W/stock gm mls head gaskets doesnt have PTV issues with the MS3 cam. I had stg 1 LS6 heads with an MS3 and never had an issue, the only problem I had with that combo was running door to door with AFR 205/G5X3 combo'd cars.
1) AFR Heads have a Carb EO because they are direct replacement heads
2) In the certification testing, the heads ran cleaner than stock and improved fuel economy. If that doesn't tell you something about combustion efficiency, it ought to.
3) AFR 205 heads have a greater valve drop than stock castings (i.e. more PTV clearance) which could save you the time/materials/effort of cutting reliefs in your stock pistons, or allow you to run a larger cam without PTV issues.
4) AFR heads running 2.02/1.60 valves are flowing similar to stg 2.5 ported castings with larger valves, which will increase shrouding in a 3.9" bore. Same results on a 4" or 4.125" bore do not necessarily bear out when installed on a 3.9" bore.
5) Any aftermarket casting gains the benefit of starting with a clean slate. Properly engineered castings can address all the factory weaknesses and put material where it needs to be to make sure the finished product is strong enough after CNC work is done.
Are they expensive? That is a relative term...buying two sets of heads to get the results you are after will definitely cost more than buying the right ones the first time.
Are they worth it? Do some research and decide for yourself. AFR, TFS, PRC are all quality products. Look for consistant results, do your homework, and address all the details, and you will be happier in the long run.
Good Luck!
2) In the certification testing, the heads ran cleaner than stock and improved fuel economy. If that doesn't tell you something about combustion efficiency, it ought to.
3) AFR 205 heads have a greater valve drop than stock castings (i.e. more PTV clearance) which could save you the time/materials/effort of cutting reliefs in your stock pistons, or allow you to run a larger cam without PTV issues.
4) AFR heads running 2.02/1.60 valves are flowing similar to stg 2.5 ported castings with larger valves, which will increase shrouding in a 3.9" bore. Same results on a 4" or 4.125" bore do not necessarily bear out when installed on a 3.9" bore.
5) Any aftermarket casting gains the benefit of starting with a clean slate. Properly engineered castings can address all the factory weaknesses and put material where it needs to be to make sure the finished product is strong enough after CNC work is done.
Are they expensive? That is a relative term...buying two sets of heads to get the results you are after will definitely cost more than buying the right ones the first time.
Are they worth it? Do some research and decide for yourself. AFR, TFS, PRC are all quality products. Look for consistant results, do your homework, and address all the details, and you will be happier in the long run.
Good Luck!