Swapping from 241's to 243's...which mods to get and what's a waist of money?
09-08-2010, 04:32 PM
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Swapping from 241's to 243's...which mods to get and what's a waist of money? I have a stock LS1 with LG G5X3 cam, port and polished tb, pacesetter lt's/catless mids, and 05 magnaflow exhaust. I'm looking at a set of 243's which have been port and polished, so basically budget wise my options would be finding a stock 05/06 intake manifold and having it ported and 90mm throttle body?
If I want to step things up looking for a FAST 90mm intake and tb? Would the FAST 102 with Nick Williams 102 be way over kill for something like what I am going after? I plan on some nitrous in the future but other than that in the future a forged 383 but that would be it as far as motor items went.
I have been doing a lot of searching just hate doing things twice and I know if I went with the FAST parts I would need new bolts and fuel rails etc, so I'm just trying to find best bang for the buck.
If I want to step things up looking for a FAST 90mm intake and tb? Would the FAST 102 with Nick Williams 102 be way over kill for something like what I am going after? I plan on some nitrous in the future but other than that in the future a forged 383 but that would be it as far as motor items went.
I have been doing a lot of searching just hate doing things twice and I know if I went with the FAST parts I would need new bolts and fuel rails etc, so I'm just trying to find best bang for the buck.
09-08-2010, 04:37 PM
#2
Find a fast 78mm intake for cheap. Buy a professional products 85mm throttle body ($180 new) and port match your fast to it. If you're ambitious take the thing apart and radius all the trumpet inlets and port match the base piece to your heads. That's what I'd do, er wait thats what I did. Sold my LS6 intake for $300 and bought the fast 78 for $300. I gained about 33 rwhp / 27 rwtq through the entire curve with the addition of the fast 85 and an underdrive pulley. This is on unported 243 heads and small 224 cam.
09-08-2010, 04:49 PM
#5
don't use a ls2 intake.if you get a used fast 90/92 intake you can use the stock ls1 fuel rail.the fast 102 ain't over kill ,just expensive .consider what nitroused 383 said,he has pics on how to make the fast intake really work great.or maybe he will port a intake for you.
09-08-2010, 04:52 PM
#6
The LS2 manifold has the same style intake ports as the LS1 manifold. L76/L92/LS3 intake manifolds have the square ports.
With a properly ported set of 243's and good camshaft, you can make loads of power with the stock LS6 intake/ported stock TB. If you must have a bigger intake, the 92mm will be plenty for that setup.
With a properly ported set of 243's and good camshaft, you can make loads of power with the stock LS6 intake/ported stock TB. If you must have a bigger intake, the 92mm will be plenty for that setup.
09-08-2010, 04:59 PM
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The LS2 manifold has the same style intake ports as the LS1 manifold. L76/L92/LS3 intake manifolds have the square ports.
With a properly ported set of 243's and good camshaft, you can make loads of power with the stock LS6 intake/ported stock TB. If you must have a bigger intake, the 92mm will be plenty for that setup.
With a properly ported set of 243's and good camshaft, you can make loads of power with the stock LS6 intake/ported stock TB. If you must have a bigger intake, the 92mm will be plenty for that setup.
Is it worth having bigger valves put into 243's or cost wise is it just better to step up to some AFR's or Trickflow's?
The car runs great now with the tune in it, but lets say I did as was advised and found a FAST 78mm with TB with the port and polished 243's, would the car be able to drive to have it tuned or would it throw the tune so far out I would need to have it towed to the tuner?
Last edited by Jonnie Bravo; 09-08-2010 at 05:06 PM.
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09-08-2010, 05:12 PM
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Just pick up some PRC 243s from texas speed, make sure that cam wouldn't have any PTV issues though. The Fast 102mm would be overkill for a 346 but the FAST 90/92m would help out a little. But wouldn't you rather have 50hp more with the heads than 5hp more with the FAST for nearly the same money. That LS6 manifold isn't too much of a restriction until you're over 440-450rwhp.
09-08-2010, 05:17 PM
#9
Awesome information here and thank you, this is exactly the info I was looking for as I have very realistic expectations of mods but when calling different people trying to do research was swayed a million different ways.
Is it worth having bigger valves put into 243's or cost wise is it just better to step up to some AFR's or Trickflow's?
The car runs great now with the tune in it, but lets say I did as was advised and found a FAST 78mm with TB with the port and polished 243's, would the car be able to drive to have it tuned or would it throw the tune so far out I would need to have it towed to the tuner?
Is it worth having bigger valves put into 243's or cost wise is it just better to step up to some AFR's or Trickflow's?
The car runs great now with the tune in it, but lets say I did as was advised and found a FAST 78mm with TB with the port and polished 243's, would the car be able to drive to have it tuned or would it throw the tune so far out I would need to have it towed to the tuner?
Stock valves are fine. I have no trouble making 440-450rwhp out of stock valved 243's with a good camshaft and good flowing exhaust. Check out Advanced Inductions 243 porting. Phil over there has the 243's figured out better than most IMO, and gets some nasty flow #'s in the .300-.500 range with a stock valve.
www.advancedinduction.com
Instead of spending money on the FAST intake, look into using the sodium filled LS6 valves. The lighter valve will allow you to run tighter clearances for more head milling (more compression), much more valvetrain stability and prolonged spring life. A.I. offers these valves with their porting packages.
09-08-2010, 05:19 PM
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Just pick up some PRC 243s from texas speed, make sure that cam wouldn't have any PTV issues though. The Fast 102mm would be overkill for a 346 but the FAST 90/92m would help out a little. But wouldn't you rather have 50hp more with the heads than 5hp more with the FAST for nearly the same money. That LS6 manifold isn't too much of a restriction until you're over 440-450rwhp.
