pHEnomIC

iTrader: (14)

0How much difference in power is there between these two heads (PRC Stage 1.5-2.5 and AFR 205 or 225)? I am running a full bolton ls1 with torquer v3 cam. I am considering doing some heads instead of nitrous, where will these two different heads put me power and behavior wise? I realize one set is very cheap and the other is top dollar, want to know if the difference in price is really worth it.

COD02SS

In one word.. NO. The AFR's are a nice piece but the PRC's are the best bang for the buck head for the LSX cars

lilbuddy1587

iTrader: (1)

You don't have a clue as to what you're talking about.

The AFR's will generally make more power all over. And it should for the money you pay.

How many 450-500whp 346/347 combo's do you see using PRC heads? How many do you see using AFR's ?

mike c.

iTrader: (1)

LILBUDDY1587-I AGREE. The AFR head is the way to go. I made 463hp 414tq w/AFR 205 heads on a mustang dyno w/12bolt & 4.11's,346ci. I had a budjet ported head from a top sponsor before and I gained 47hp from the AFR head. The AFR head is truly an awsome product.

pist0lpete

iTrader: (3)

People look at peak power numbers alot and the AFR will gain some power there over the PRC 1.5s as well. However don't overlook the power under the curve which is another place heads like the AFR and TFS for example reallly shine.

qwikz28

iTrader: (12)

the highest dynoing 346 heads/cam has prc stage 1.5s! thats what i have

but in general AFRs will make more power. ever consider Trick Flow heads?

KingSS

iTrader: (1)

My car makes 475 rwhp 412 rwtq with PRC 2.5 5.3's and the MS3. I am pretty sure there are quite a few other people with that setup doing about the same power. You dont need to pay 2500 dollars to make big power, just get the right setup that matches and you can make good power.

lilbuddy1587

iTrader: (1)

I dont care what YOUR car makes. In general, the AFR heads WILL produce better results, period.

Edit- I'm not knocking TSP products, they are in fact a great bang for your buck. Check my sig to see that I use their Terminator heads.

fastvet

iTrader: (2)

AFR heads are truly one of the best heads out there for the LS1, and so are the Trickflows. PRC's are also great, but if you dont have that much money that you want to blow on those types of heads and get nearly the same results, do what I did. I ran my numbers and did my research on price and flow numbers! Best Bang for the Buck on LS1 Heads, remember, I said for the BUCK$$$! I would go with patriot performance ls6 stage 3 heads. They flow 322 at .600 lift and you can get them at 64cc's. They automatically outflow the 205's that AFR has, and barely get beat throughout the RPM range by the 225 mongoose.
LS6Stage3 225 mongoose
Lift Patriots AFR's

.200 147 150
.300 209 220
.400 255 266
.500 296 304
.550 312 313
.600 322 320

Notice the power hits hard on the patriots from .500 - .600 lift. thats where you want the power for top end. Granted the AFR's have better lower power.
Check them out at www.patriot-performance.com

pHEnomIC

iTrader: (14)

What kind of power are you makin on the partriot ls6's, do you have a dyno graph by chance?

c5_ls1_6spd

iTrader: (-1)

Trickflow 215s outflow both heads above. They flow close to 330cfm @ .600 lift

N4cer

iTrader: (11)

There's really no debating it. AFR's produce more consistently high numbers. Period. Are the TSP heads a great value? ABSOLUTELY! But budget is still budget.

fastvet

iTrader: (2)

havent had my car dyno'd yet. But am also running a 224/230 .581/.588 114 lsa cam. mild cam, but on my m6 i've hit 11.7's N/A. If you really want to make a difference and get more power, go with the 5.3 liter heads stage 3. It gives your car a higher compression ratio and has the same flow chart as the ls1/ls6, just different compression. This is one of the secrets of the trade that you can ask any mechanic about. PCR's look great, but for the price and performance I would go with patriots. Nothing against Texas-speed, but if your trying to save money, thats the way to go. but like I said earlier, do your own research and and come up with the numbers you want to play with.

fastvet

iTrader: (2)

your right about this, but the price of these heads go for as much as the AFR's, if not a little bit more.

pHEnomIC

iTrader: (14)

What type of tires did you run for the 11.7s? 11s on street tires n/a would be awesome imo.

fastvet

iTrader: (2)

Mickey Thompsons E.T. Streets bias. they are 26x11.5 r17 I launch at about 4000 rpms.

KingSS

iTrader: (1)

YOU made a stupid, generalized statement. I was just using my car as an example. No doubt AFR heads are a top notch product, but it is wrong to say you have to spend that much money to make that kind of power.

Also, stage 3 heads usually have very large valves. I think its usually a 2.08/1.60. For the stock cube motor these valves are too big and the motor will have lazy low end power.

fastvet

iTrader: (2)

KingSS you have a point with lazy low end power. But when you have a cam that starts its powerband at 2300 rpm's(according to texas speed's v.3 torquer) you need heads that open that big at the top end. Ofcourse, this also brings in the fact of changing the rear gears. You have to get to that high rpm quicker. I'd say, on an everyday driver m6, 3.90's or 4.10's with that setup would ROCK!!! with the right tune, you should see mid-11's.

I run 4.10's 0n my m6 vette and at 70mph i am at 1900rpm's.

lilbuddy1587

iTrader: (1)

I'm not going to sit here and argue with you. There was no "Stupid, generalized statement". AFR,TFS,ETP etc. will ALL make, on average, more power than your typical bang for your buck head such as PRC and Patriot, its a no brainer.

It's wrong to say you have to spend big money to make big power? That my friend is a STUPID generalized statement. Anyone knows that it takes money to make power, period. Sure you may get a few people that have friendly dyno's making exceptional power with budget products but thats a very choice few people. As far as you using your car as an "example", it's not a very good one because not many people will achieve your results using the same budget combo. Good day

- Unsubscribing

mike c.

iTrader: (1)

I was 25hp more on one dyno jet and 33hp more on another over the mustang dyno I dyno on. So, my 463hp #'s(stang dyno) on one of the dyno jets I would of been 488hp on the other 496hp. Does this mean my AFR's were better then some talked about in this section? It must since poeple talk dyno #'s on this site all the time. I also gained under the curve like crazy too. The highest dyno # machine I've been on is speed inc's. My bud just got a 383ci built with trick flow 215heads cam in the 240/244 range(SAME AS I HAD) FAST 90MM all the boltons m6 car. It seems my little 346ci w/AFR heads still makes more power and we go to the same dyno and get tuned by the same guy. does this mean my AFR's were better? NO....I'm not saying better,but they do perform well and you get what you payfore with this head.
ALSO,someone in this section talked about 5.3ltr heads,I have not seen anything good from 5.3 heads performance wise.
LILBUDDY1587-I'm still agreeing with you bro.
What ever you choose-GOODLUCK TO YA.