PRC or AFR heads
Originally Posted by JakeFusion
Tony, I think AFR heads are about the best out there, but that's not a fair comparison. We have dynos of the PRC heads and they pick up close to the same amount of HP and nearly as much torque as the AFR 205s. Plus, they are based on the GM casting, which we all know is utterly inferior. How else would LS1s with over 150k miles still be running perfectly fine? <-- Sarcasm.
Phil, if you aren't going to spray huge amounts of nitrous on your engine or run loads of boost, the PRCs will be fine, especially for the price. Hell, for the amount of money saved, you could buy a nitrous kit to go with the PRCs and spray a 150 shot (which won't destroy stock heads because of their inferior deck thickness) and you will wipe the floor with the AFR headed car you would have had.
But, if you have the money, then this isn't an issue. Buy the AFRs because it is a better head, and you'll pay for it. If it is, then the PRCs and nitrous is a better value.
. what you buy is what you get with the AFR's. to me consistancy is worth an extra weeks paycheck. and in the grand scheme of things when your all said and done a h/c setup will run you ~3k, whats a few more dollars spend toward the better heads...
Some of these replies really entertain me! Just because some products cost alot more doesn't mean the product is better. I like AFR heads alot, they flow what they're suppose to & offer a thicker deck for the n2o & boost guys. That being said the PRC head flows more air, offers more compression, & has better springs.
The statements about consistancy is completely rediculous! All PRC cylinder heads are checked & triple check & I believe are every bit as consitant as the AFR heads. Just because something is alot more expensive doesn't always make it better. Maybe it means they just have alot of overhead...
The bottom line is both heads are really nice & will offer great power gains!
The statements about consistancy is completely rediculous! All PRC cylinder heads are checked & triple check & I believe are every bit as consitant as the AFR heads. Just because something is alot more expensive doesn't always make it better. Maybe it means they just have alot of overhead...
The bottom line is both heads are really nice & will offer great power gains!
Originally Posted by jrp
or better yet why doesnt one just buy an even cheaper head then the PRC and just buy a bigger nitrous kit and wipe the floor with the PRC headed car you would of had .
what you buy is what you get with the AFR's. to me consistancy is worth an extra weeks paycheck. and in the grand scheme of things when your all said and done a h/c setup will run you ~3k, whats a few more dollars spend toward the better heads...
. what you buy is what you get with the AFR's. to me consistancy is worth an extra weeks paycheck. and in the grand scheme of things when your all said and done a h/c setup will run you ~3k, whats a few more dollars spend toward the better heads...
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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
Jason, my post was not meant to imply the PRC heads are inconsistant. my point was show Jake's error of reasoning. Phil is just looking for a reason not to get AFR's over MTI, PRC, TEA, ect, ect. like i stated, what you get with AFR is consistancy, just look at all the guys that have swapped from XYZ to AFR and have nothing but praise. im sure those XYZ vendors all touted there heads as being "the ****" and yet when it came down to it they didnt perform. since AFR's inception i havent seen an independent set that was +/- 8cfm from what is advertised. unfortunately the same cant be said for alot of others...
compression can be made up my milling and thinner gasket, the heads can be bought bare for the springs and valves of your choice, or you can upgrade the springs to the 8019's (i believe) which have seat and open pressure comperable if not more then the platinum springs. even so, the standard associated golds have already proven to be a great spring and more then what is needed for most cams out there.
like i said in my PM, i'll have a chance too see some independent numbers on a new set of PRC's, im interested too see how they fair.
and for the record my heads where "advertised" TWICE to flow more then a set of AFR's, to bad independent testing didnt share the porters same enthusiam....
compression can be made up my milling and thinner gasket, the heads can be bought bare for the springs and valves of your choice, or you can upgrade the springs to the 8019's (i believe) which have seat and open pressure comperable if not more then the platinum springs. even so, the standard associated golds have already proven to be a great spring and more then what is needed for most cams out there.
like i said in my PM, i'll have a chance too see some independent numbers on a new set of PRC's, im interested too see how they fair.
and for the record my heads where "advertised" TWICE to flow more then a set of AFR's, to bad independent testing didnt share the porters same enthusiam....
TECH Resident
Joined: Sep 2003
Posts: 848
Likes: 1
From: Working in the shop 24/7
Originally Posted by PREDATOR-Z
So the trick is find good quality at a reasonable price- ie "cutout the middleman"
Y'all gotta tell me about that deal JRP!
Ed
I think the best part about all of these comparisons is that some of the people talking down the PRC's have never even seen a set! We could charge $2,182 for a set of PRC's, but there isn't much bang-for-the-buck. Price is a driving force in the cylinder head market, and we can offer the PRC's for a great price. That doesn't mean that the heads are inferior. Every part on the PRC's are American-made. They come standard with Manley valves on the stage 2 and 2.5's, they use a valve spring that will take up to .660" lift, they can be shaved to net the customer's desired CR, etc. If we're going to talk about a product being better than another let's use facts and not shots-in-the-dark. We all know who set the bottom on the market and scared people with an array of problems. Don't judge another product simply because it can offer an excellent price with quality parts. It would be one thing to not like a product based on an experience with them, but it's another to talk a product down simply because they're cheaper in price.
As more and more results roll in from customers, I think we'll see the scare tactics fall to the side.
If anyone has any questions or concerns about any of the PRC cylinder heads, feel free to give me a call or shoot me an e-mail at trevor@texas-speed.com.
Trevor
Texas Speed & Performance
As more and more results roll in from customers, I think we'll see the scare tactics fall to the side.
If anyone has any questions or concerns about any of the PRC cylinder heads, feel free to give me a call or shoot me an e-mail at trevor@texas-speed.com.
Trevor
Texas Speed & Performance
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Not trying to hijack, but how much nitrous shot size or boost has either head been proven to, and repeatability is a good thing in this case? Cylinder pressure can make for some bad times, and coming from PP headed car, I am looking into a swap.
TECH Resident
Joined: Apr 2003
Posts: 791
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From: Tulsa, Ok
Originally Posted by Trevor @ Texas Speed & Perf.
We all know who set the bottom on the market and scared people with an array of problems.
Trevor
Texas Speed & Performance
Trevor
Texas Speed & Performance
11 Second Club
Joined: Feb 2003
Posts: 5,524
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From: The South
Originally Posted by KGSloan
...and we all know who pimped those products and told us they were great too.
Originally Posted by CAT3
Not trying to hijack, but how much nitrous shot size or boost has either head been proven to, and repeatability is a good thing in this case? Cylinder pressure can make for some bad times, and coming from PP headed car, I am looking into a swap.
you want dyno #s here.
434 rwhp @ 6000
413 rwtq @ 4500 approx cant remember
made over 400rwhp from 4700-7000
PRC 2.5's, Futral FM-8 N2O cam 225/233 .59/.59 114, all major bolt-on's.
I am very pleased with my decision. And too the guy asking about nitrous on either heads. I made 648rwhp 700rwtq from a 225 shot. This was on the stock short block.
Now back on topic.
434 rwhp @ 6000
413 rwtq @ 4500 approx cant remember
made over 400rwhp from 4700-7000
PRC 2.5's, Futral FM-8 N2O cam 225/233 .59/.59 114, all major bolt-on's.
I am very pleased with my decision. And too the guy asking about nitrous on either heads. I made 648rwhp 700rwtq from a 225 shot. This was on the stock short block.
Now back on topic.
Well im not sure what to say about a thread I started. I feel like Dr. Frankstein.
It was a pleasure talking to Tony at AFR and Jason at TSP today. Both enlightened me not only about heads, but how my car will react to a little TR224 which at one time was a big cam
Both of you answered an array of questions about more than just heads on the car, but additional parts I thought ID need but wont need.
like I said in the first thread, leaving 10 RWHP on the table isnt a factor for me. ID be happy with 410 RWHP, and I think Id make it with AFR and be close with PRC.
I wont be putting juice in the car so that is off the table.
Id like for the car to be able to be driven on a hot florida day w/o pinging on 92 oct
I just have to see if personally Id like to buy heads and a clutch for the same price I can buy a slightly better head
It was a pleasure talking to Tony at AFR and Jason at TSP today. Both enlightened me not only about heads, but how my car will react to a little TR224 which at one time was a big cam
Both of you answered an array of questions about more than just heads on the car, but additional parts I thought ID need but wont need.
like I said in the first thread, leaving 10 RWHP on the table isnt a factor for me. ID be happy with 410 RWHP, and I think Id make it with AFR and be close with PRC.
I wont be putting juice in the car so that is off the table.
Id like for the car to be able to be driven on a hot florida day w/o pinging on 92 oct
I just have to see if personally Id like to buy heads and a clutch for the same price I can buy a slightly better head
Originally Posted by EDC
"Just an old proverb"...
The bitterness of poor quality remains long after the sweetness of the low price is forgotten!
Ed
The bitterness of poor quality remains long after the sweetness of the low price is forgotten!
Ed
Originally Posted by Phil'sC5vette
like I said in the first thread, leaving 10 RWHP on the table isnt a factor for me. ID be happy with 410 RWHP, and I think Id make it with AFR and be close with PRC.
I just have to see if personally Id like to buy heads and a clutch for the same price I can buy a slightly better head
I just have to see if personally Id like to buy heads and a clutch for the same price I can buy a slightly better head
Get the PRC's and put the extra money towards the clutch....I'm sure they will work fine. Seems you are not as concerned with some of the unique features and structural benefits the AFR's offer as you are with saving the money. I'm not even kidding....the AFR's are a good head but no product is the right choice for everybody.
Plus I think if this goes on much longer I might have a nervous breakdown
(Just having some fun....
Seems we could use a little "levity" on this board of late...) Anyway, it looks to me like a no lose situation....either direction you...uuum....choose....has it's merits and would would work out well
Tony M.
