View Poll Results: AFR 205's or PRC 220 5.3L stage 2.5
AFR's
51
73.91%
PRC's
18
26.09%
Voters: 69. You may not vote on this poll
AFR 205's or PRC 220cc 5.3L stage 2.5
08-06-2007, 10:51 AM
#1
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AFR 205's or PRC 220cc 5.3L stage 2.5 Just curious what you guys think. My friend has an MS3 on 111LSA he's going to sell to me for a good price and was wondering which heads I should get and why. And I do believe that the MS3 will work with the AFR's without any additional work? The PRC's will fit without additional work. Well I've been reading a little bit about both heads and hear great things about them. Which heads do you think I would see more of a gain?
08-06-2007, 01:46 PM
#3
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Both heads are excellent. Just remember to get the highest static compression you can run with your avaible fuel. Compression will give you lots more torque. More torque means more hp.
Both heads are excellent. Just remember to get the highest static compression you can run with your avaible fuel. Compression will give you lots more torque. More torque means more hp.
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2013 Corvette Grand Sport A6 LME forged 416, Greg Good ported TFS 255 LS3 heads, 222/242 .629"/.604" 121LSA Pat G blower cam, ARH 1 7/8" headers, ESC Novi 1500 Supercharger w/8 rib direct drive conversion, 747rwhp/709rwtq on 93 octane, 801rwhp/735rwtq on race fuel, 10.1 @ 147.25mph 1/4 mile, 174.7mph Half Mile.
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2009.5 Pontiac G8 GT 6.0L, A6, AFR 230v2 heads. 506rwhp/442rwtq. 11.413 @ 121.29mph 1/4 mile, 168.7mph TX Mile
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2013 Corvette Grand Sport A6 LME forged 416, Greg Good ported TFS 255 LS3 heads, 222/242 .629"/.604" 121LSA Pat G blower cam, ARH 1 7/8" headers, ESC Novi 1500 Supercharger w/8 rib direct drive conversion, 747rwhp/709rwtq on 93 octane, 801rwhp/735rwtq on race fuel, 10.1 @ 147.25mph 1/4 mile, 174.7mph Half Mile.
2016 Corvette Z51 M7 Magnuson Heartbeat 2300 supercharger, TSP LT headers, Pat G tuned, 667rwhp, 662rwtq, 191mph TX Mile.
2009.5 Pontiac G8 GT 6.0L, A6, AFR 230v2 heads. 506rwhp/442rwtq. 11.413 @ 121.29mph 1/4 mile, 168.7mph TX Mile
2000 Pewter Ram Air Trans Am M6 heads/cam 508 rwhp/445 rwtq SAE, 183.092 TX Mile
2018 Cadillac Escalade 6.2L A10 Pat G tuned.
LS1,LS2,LS3,LS7,LT1 Custom Camshaft Specialist For custom camshaft help press here.
Custom LSX tuning in person or via email press here.
08-06-2007, 09:07 PM
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downside of the AFRs is that they have a near stock compression (unmilled).
the 5.3s should boost compression a bit.
like patrick said...its all about compression for your available fuel.
my vote...5.3s
particularly for the ms3...the cam could use the better flow of the 220 runner...without being an overkill
the 5.3s should boost compression a bit.
like patrick said...its all about compression for your available fuel.
my vote...5.3s
particularly for the ms3...the cam could use the better flow of the 220 runner...without being an overkill
08-07-2007, 02:21 AM
#6
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Thanks for all the input guys. The 5.3's will raise my compression to 10.75, what other things could I do to raise compression without having to spend a lot of $? And also I understand the ms3 is a big top end cam, if I dont like the results with the low end power i may switch cam's. Im atleast shooting for 460-470 to the wheels and I think the ms3/PRC combo would get me there but I'm also planning on a ported fast 90/90. I was thinking of a smaller cam and the fast 90/90 would keep me in the 460-470rwhp range. What do ya think?
08-07-2007, 07:02 AM
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I made 460 to the tire with the stage 1 prc ls6 heads.... Why go 5.3's? I'm running and MS3 also on an ls6 intake without an elec water pump... So 475-480 shouldn't be to far out of my reach on this 95k motor.
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08-07-2007, 07:04 PM
#8
Originally Posted by teke184
downside of the AFRs is that they have a near stock compression (unmilled).
the 5.3s should boost compression a bit.
like patrick said...its all about compression for your available fuel.
my vote...5.3s
particularly for the ms3...the cam could use the better flow of the 220 runner...without being an overkill
the 5.3s should boost compression a bit.
like patrick said...its all about compression for your available fuel.
my vote...5.3s
particularly for the ms3...the cam could use the better flow of the 220 runner...without being an overkill
there is no downside to AFR's. You want more compression you mill them. The AFR's are a step above.Its a money issue here really. If you've got the coin for the AFR's then buy them. You can still get a good deal on them at Texas Speed so it's not big deal here. The AFR is the better head.
Last edited by 99blancoSS; 08-07-2007 at 08:20 PM.
08-20-2007, 10:55 PM
#9
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sounds like u have the cash, with the ported 90/90, milled afr heads for sure u would get to your goal. check my combo in my sig, decent power, unmilled heads and unported fast 90 nw tb.
08-21-2007, 12:15 AM
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Don't forget about Patriot Performance CNC ported cylinder heads for the LSX engines.
By the way this is a topic beaten to death on this forum. It gets asked almost weekly
By the way this is a topic beaten to death on this forum. It gets asked almost weekly
08-21-2007, 11:38 AM
#12
If you have the $$$. Get the AFR's and mill them. You will not be dissappointed. They will flow better in the low/mid range than any stock casting and perform great in the upper RPM/lift range as well. They have a thicker deck if you decide to run nitrous also.
I'd look at the TrickFlow castings as well. They have been putting up good numbers just like the others.
I'd look at the TrickFlow castings as well. They have been putting up good numbers just like the others.
08-22-2007, 12:09 AM
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Originally Posted by mcamarols1
get the trickflow 215 heads
08-22-2007, 12:19 AM
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its what ever fits into your budget the best. If the extra 1k dollars doesnt hurt you at all then look at the edlebrock, afr, etp, etc heads. If that hurts the wallet to much then look at the ported stockers/dart heads.
The top dollar heads are nice, but if its the difference between you being able to buy out right with money in hand, and putting it on the credit card then i dont think its worth it. the extra hp isn't worth being in debt.
Just my thoughts
The top dollar heads are nice, but if its the difference between you being able to buy out right with money in hand, and putting it on the credit card then i dont think its worth it. the extra hp isn't worth being in debt.
Just my thoughts
08-31-2007, 09:25 AM
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i would think unless you mill the AFRs...the increased compression of the 5.3s would yield the same if not higher power.
the AFRs may get a bit more down low with the smaller runner, but a 220cc runner is not bad for that size cam.
the AFRs may get a bit more down low with the smaller runner, but a 220cc runner is not bad for that size cam.
08-31-2007, 09:26 AM
#19
It all depends on your setup and if you mill the heads. The 5.3's are a good inexpensive way to go. You can raise your compression without milling them. If you've got the money then you go with AFR's and have Tony work them over a bit. My guess is that there might be a 10-20 hp difference.
I've got a new setup that I need to get tuned and then I can provide some real world data on TSP heads vs AFR.
I've got a new setup that I need to get tuned and then I can provide some real world data on TSP heads vs AFR.