Any big HP AFR cars yet?
09-13-2004, 05:37 PM
#1
Any big HP AFR cars yet? Where are all of the 500+ rwhp 346s and 600+ rwhp 408s? I thought that once the AFRs were readily available, with aggressive H/C cars reaching 480-500rwhp, and 408s regularly reaching 500-550 and beyond with "traditional" LSx heads, some BIG numbers would start coming out, but I've yet to see anything that outperforms OEM headed combos. Where are the higher end combos at?
Shawn
Shawn
09-13-2004, 06:27 PM
#3
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I dont think the AFR heads will surpass the stock ported head for power, but mainly strength. Its already been said and showed that they barely flow better than a ported stocker.
09-13-2004, 06:35 PM
#5
How often do you hear of ls heads blowing head gaskets because of their thinner decks or what other problems would happen with the thinner decks? I have some very nice stage three ls heads that flow a ton and don't ever want to get rid of them unless I will run into problems down the road running juice. Will ls heads hold up to a 200-300 shot with the right gaskets and arp head bolts?
09-13-2004, 08:04 PM
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Yes...Ls1 heads and gaskets will hold a 300 shot with head studs. Its been done by many...just need to be absolutely sure there is no detonation. I just think the AFRs had a few design quilities that would have made them worth while. I wanted the "as cast" version so TEA could put the raised runner port in it. Which BTW they now have digitized and ready to run.
These "as cast" heads also come with seats and guides already installed I believe, which keeps from having to do more labor removing the stock LSx seats and guides and installing new ones. Also in my case we used a 1.550 dual sping for the solid roller setup. Cutting those pockets on the 6.0 heads was nerve racking. Thanks to a few tricks TEA did not bust through and they will be set up perfect with no issues. But with the AFRs I dont think it will be a problem at all. Then there is the deck thickness...this can only be a good thing.
So in the right hands...the AFRs may have some advantages.
As for how the 205cc and 225cc version stack up....no clue. Have not been following that at all.
These "as cast" heads also come with seats and guides already installed I believe, which keeps from having to do more labor removing the stock LSx seats and guides and installing new ones. Also in my case we used a 1.550 dual sping for the solid roller setup. Cutting those pockets on the 6.0 heads was nerve racking. Thanks to a few tricks TEA did not bust through and they will be set up perfect with no issues. But with the AFRs I dont think it will be a problem at all. Then there is the deck thickness...this can only be a good thing.
So in the right hands...the AFRs may have some advantages.
As for how the 205cc and 225cc version stack up....no clue. Have not been following that at all.
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09-13-2004, 09:38 PM
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The car is a 99 C5 automatic. My new LS6 engine was dyno'd on Friday, Sep 10. It's a stock bottom LS6 with AFR 205 (59 cc, 11.1 or 11.24 CR), ASP underdrive pulley, Ford SVO 30 lb injectors, Blackwing, LG headers without cats, stock muffler, LG G5-X3 cam, LS6 intake, stock throttle body (not ported), stock MAF, 3.42 gear, Midwest Converter 1800 stall, and 160 thermostat.
We made 6 dyno runs. Peak numbers were 414 rwhp and 393 rwtq.
I'm very happy with the numbers. The LG header made the Borla XR-1 way too loud (didn't appear there was enough room for the resonator so it was basically straight pipe exhaust) so I put on the stock mufflers which may be costing 10 hp. Next spring, when the snow melts, I will add a 90mm intake and matching tb along with 85mm or larger MAF. I think it could make 440 rwhp.
We made 6 dyno runs. Peak numbers were 414 rwhp and 393 rwtq.
I'm very happy with the numbers. The LG header made the Borla XR-1 way too loud (didn't appear there was enough room for the resonator so it was basically straight pipe exhaust) so I put on the stock mufflers which may be costing 10 hp. Next spring, when the snow melts, I will add a 90mm intake and matching tb along with 85mm or larger MAF. I think it could make 440 rwhp.
09-13-2004, 10:36 PM
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Originally Posted by Country Boy
I dont think the AFR heads will surpass the stock ported head for power, but mainly strength. Its already been said and showed that they barely flow better than a ported stocker.
09-13-2004, 11:26 PM
#12
Originally Posted by 383LQ4SS
Yes...Ls1 heads and gaskets will hold a 300 shot with head studs. Its been done by many...just need to be absolutely sure there is no detonation. I just think the AFRs had a few design quilities that would have made them worth while. I wanted the "as cast" version so TEA could put the raised runner port in it. Which BTW they now have digitized and ready to run.
These "as cast" heads also come with seats and guides already installed I believe, which keeps from having to do more labor removing the stock LSx seats and guides and installing new ones. Also in my case we used a 1.550 dual sping for the solid roller setup. Cutting those pockets on the 6.0 heads was nerve racking. Thanks to a few tricks TEA did not bust through and they will be set up perfect with no issues. But with the AFRs I dont think it will be a problem at all. Then there is the deck thickness...this can only be a good thing.
So in the right hands...the AFRs may have some advantages.
As for how the 205cc and 225cc version stack up....no clue. Have not been following that at all.
These "as cast" heads also come with seats and guides already installed I believe, which keeps from having to do more labor removing the stock LSx seats and guides and installing new ones. Also in my case we used a 1.550 dual sping for the solid roller setup. Cutting those pockets on the 6.0 heads was nerve racking. Thanks to a few tricks TEA did not bust through and they will be set up perfect with no issues. But with the AFRs I dont think it will be a problem at all. Then there is the deck thickness...this can only be a good thing.
So in the right hands...the AFRs may have some advantages.
As for how the 205cc and 225cc version stack up....no clue. Have not been following that at all.
09-14-2004, 09:22 PM
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i should be getting some dyno numbers with my hand ported stage 3 afr heads in the next week or two hopefully from fms from my 408, along with the 243/250 cam, so hopefully through a 12 bolt and 390 gears, i will be able to dyno around 550 rwhp or more.
