AFR and TFS headed 346 bottom end owners come in
10-10-2007, 03:59 PM
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AFR and TFS headed 346 bottom end owners come in list your Mods, rwhp/rwtq numbers and track times please.
Im trying to debate if switiching from PRC LS6 ported heads to AFR 205s OR TFS 215s is worth it?
Im trying to debate if switiching from PRC LS6 ported heads to AFR 205s OR TFS 215s is worth it?
10-10-2007, 04:40 PM
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Both are TOP NOTCH heads. Should be a good comparison !!! I have a set of AFR's for sale if your interested. Im interested in the comparison. Oh, and what mods and numbers are you putting down with your package?
10-10-2007, 05:17 PM
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I don't know if it's worth selling your ls6 heads to change to them but. My mods and HP are listed below. It ran a best of 11.42 @ 120.
And STD dyno #'s were 471 rwhp and 582 rwhp on the 100 shot.
And STD dyno #'s were 471 rwhp and 582 rwhp on the 100 shot.
10-10-2007, 06:47 PM
#5
To make it short and simple for you I'll break it down like this. Been there done that. Is it worth all the extra work and money to make just a few ponies more??
PRC ls6 heads flow very good and make very good numbers. If you didnt buy the AFR or TFS in the first place I really dont think it's worth the money to change heads unless You have the money and want the absolute best you can do with a n/a 346.
Your looking at a minimum of 3k to do it right. Off the shelf AFR's or TFS wont do it alone. You will need to meticulously plan your new setup to achieve worth while gains and even then you might only be talking about say 11-25 hp. Is $3000+ worth 11-25 HP and there is no guaranty you will gain anything. Only you can answer that for you.
PRC ls6 heads flow very good and make very good numbers. If you didnt buy the AFR or TFS in the first place I really dont think it's worth the money to change heads unless You have the money and want the absolute best you can do with a n/a 346.
Your looking at a minimum of 3k to do it right. Off the shelf AFR's or TFS wont do it alone. You will need to meticulously plan your new setup to achieve worth while gains and even then you might only be talking about say 11-25 hp. Is $3000+ worth 11-25 HP and there is no guaranty you will gain anything. Only you can answer that for you.
10-11-2007, 12:48 AM
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. . . PRC ls6 heads flow very good and make very good numbers. If you didnt buy the AFR or TFS in the first place I really dont think it's worth the money to change heads unless You have the money and want the absolute best you can do with a n/a 346.
Your looking at a minimum of 3k to do it right. Off the shelf AFR's or TFS wont do it alone. You will need to meticulously plan your new setup to achieve worth while gains and even then you might only be talking about say 11-25 hp. Is $3000+ worth 11-25 HP and there is no guaranty you will gain anything. Only you can answer that for you.
Your looking at a minimum of 3k to do it right. Off the shelf AFR's or TFS wont do it alone. You will need to meticulously plan your new setup to achieve worth while gains and even then you might only be talking about say 11-25 hp. Is $3000+ worth 11-25 HP and there is no guaranty you will gain anything. Only you can answer that for you.
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10-11-2007, 11:03 AM
#11
Thats a broad suggestion that a FAST intake will net someone 20hp. Sure you dont want to re-word that.
C5 if you want to build a better top end performing package than what you have you certainly can and would with AFR's, TFS or ET's. But your going to pay for it. Your going to need to change your cam as well and you'll need to have it all spec'ed out by who ever's head you decide to go with. That FAST 90 will need to be ported as well and you need a tb to go with it. That's $1100 right there. The heads and stuff needed to make them work will be $3000 minimum. Your looking at around $4200 more or less depending on a few things. Is that money worth it to you to gain as little as 10 hp and maybe as much as 35. Your not going to gain 50hp and I doubt you'll see 40 either. Those PRC ls6 heads do very well. I have a friend who puts them on a lot of vettes and is putting down 433 on his mustang dyno with a small cam. Thats about 460 on a dynojet. At 4200 your just a few bucks awasy from some serious power with a s/c. What compression are your heads at? Did you have them shaved? A procharger with your heads is better money spent than what your thinking about.
Unless like I said before you just want the best you can do with n/a 346 no matter the cost.
C5 if you want to build a better top end performing package than what you have you certainly can and would with AFR's, TFS or ET's. But your going to pay for it. Your going to need to change your cam as well and you'll need to have it all spec'ed out by who ever's head you decide to go with. That FAST 90 will need to be ported as well and you need a tb to go with it. That's $1100 right there. The heads and stuff needed to make them work will be $3000 minimum. Your looking at around $4200 more or less depending on a few things. Is that money worth it to you to gain as little as 10 hp and maybe as much as 35. Your not going to gain 50hp and I doubt you'll see 40 either. Those PRC ls6 heads do very well. I have a friend who puts them on a lot of vettes and is putting down 433 on his mustang dyno with a small cam. Thats about 460 on a dynojet. At 4200 your just a few bucks awasy from some serious power with a s/c. What compression are your heads at? Did you have them shaved? A procharger with your heads is better money spent than what your thinking about.
Unless like I said before you just want the best you can do with n/a 346 no matter the cost.
10-11-2007, 12:37 PM
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I wouldn't switch from what you have to the 205's or 215's, if you want to stay with the LS6 heads go with a fully ported set of dart 225's. You will make more power but the L92's would make more.
If you have a built bottom end (forged pistons and rods) just add a 200 shot of nitrous.
If you have any questions please give me a call.
Thanks,
Harold
10-11-2007, 01:14 PM
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My cam is fine, I'm not changing it at all. I love my MS3
I have an LS2 TB and it's already ported as well as the FAST 90.
If I sell my heads and get a set of TFS 215s, I'll be out of pocket 2gs (heads,rockers and install).
Last edited by c5_ls1_6spd; 10-11-2007 at 01:19 PM.
10-11-2007, 01:20 PM
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If you want to change heads and make a noticeable gain in HP go with a set of our L92 heads and manifold. The head flow 370cfm, cost $1699.00 plus the manifold. You'll spend close to the same money and make a very good gain in power. I would suggest going with a new cam as well.
I wouldn't switch from what you have to the 205's or 215's, if you want to stay with the LS6 heads go with a fully ported set of dart 225's. You will make more power but the L92's would make more.
If you have a built bottom end (forged pistons and rods) just add a 200 shot of nitrous.
If you have any questions please give me a call.
Thanks,
Harold
I wouldn't switch from what you have to the 205's or 215's, if you want to stay with the LS6 heads go with a fully ported set of dart 225's. You will make more power but the L92's would make more.
If you have a built bottom end (forged pistons and rods) just add a 200 shot of nitrous.
If you have any questions please give me a call.
Thanks,
Harold
I don't think L92 heads are going to work on a 3.9 bore. I'm very very interested in the TFS 215s though.
I've only seen 1 vette with a set of trickflow 215's on it and that was my buddy steven over at LMR. he had them on his '97 C5 383 and was making close to 500rwhp NA before he sold it. That car rolled out hard.
Last edited by c5_ls1_6spd; 10-11-2007 at 01:26 PM.
10-11-2007, 02:01 PM
#16
There is a guy on here with a vette who gained nothing doing the exact same thing your thinking about doing. You wanted opinions, you got them. If you've already got the rockers and are convinced the cam is good enough to just make a head swap and pick up 20 then do it. Let's see it, I'd be very interested the results. 2k is nothing to spend.
10-11-2007, 02:44 PM
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Not sure if your more concerned about your numbers or if you just want to beat that other corvette.
Since you want to keep your MS3 just go with a small shot of nitrous. If I was in your situation I would not buy another set of heads.
Since you want to keep your MS3 just go with a small shot of nitrous. If I was in your situation I would not buy another set of heads.
10-11-2007, 03:23 PM
#18
He can also recoup some money on the heads he pulls off.
The guys at LMR have had some very good results with the TFS heads, although I don't know if the MS3 is the best cam for the TFS's, I'm sure LMR would know.
I would like to see the post of the guy who swapped those exact heads and didn't gain power, and what intake and cam he was running.
10-11-2007, 03:49 PM
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There is a guy on here with a vette who gained nothing doing the exact same thing your thinking about doing. You wanted opinions, you got them. If you've already got the rockers and are convinced the cam is good enough to just make a head swap and pick up 20 then do it. Let's see it, I'd be very interested the results. 2k is nothing to spend.