LS3 valves really that bad?
Thread Starter
Joined: Sep 2005
Posts: 8,139
Likes: 10
From: Chillicothe/Lima, Ohio
LS3 valves really that bad? I have heard a lot of people telling me to change the stock LS3 valves to something aftermarket to keep from breaking them. i just bought a set of brand new LS3 heads, fullly assembled. is it really neccessary to change from the stock hollow/sodium filled valves to something different? they are going on a 370 with an MS4 cam.
I thought the LS3 valves were pretty robust. They are very light and that's a big bonus for such a large valve. I swap heavy L92 valves for the LS3 valves all the time. The early L92 valves were the ones with all the failures.
Oh and by the way, the MS4 is not going to fit in a 370 without some big valve reliefs. Also, it's going to have more overlap than is ideal for that combo.
Oh and by the way, the MS4 is not going to fit in a 370 without some big valve reliefs. Also, it's going to have more overlap than is ideal for that combo.
__________________
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
2022 Cadillac Escalade 6.2L A10 S&B CAI, Corsa catback.
2023 Corvette 3LT Z51 soon to be modified.
Custom LSX tuning in person or via email press here.
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
2022 Cadillac Escalade 6.2L A10 S&B CAI, Corsa catback.
2023 Corvette 3LT Z51 soon to be modified.
Custom LSX tuning in person or via email press here.
Agreed, we've had alot of success with the hollow-stem LS3 valves!
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POWERBOND - ASP - AND MORE!
Thread Starter
Joined: Sep 2005
Posts: 8,139
Likes: 10
From: Chillicothe/Lima, Ohio
the pistons i have, have 3.2 cc valve releifs for a 2.165 intake.
i know the MS4 isint "ideal" but is it really going to hurt me that bad? just trying to keep from buying another cam as this engine is just a...temporary untill i can afford the stroker kit and a solid roller setup.
i know the MS4 isint "ideal" but is it really going to hurt me that bad? just trying to keep from buying another cam as this engine is just a...temporary untill i can afford the stroker kit and a solid roller setup.
Ls3 valves are great. I had three pistons break and bust awhole in my block and bang up the combustion chambers up on my heads leaving chunks of piston in my intake manifold long story short not one valve broke!
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Thread Starter
Joined: Sep 2005
Posts: 8,139
Likes: 10
From: Chillicothe/Lima, Ohio
i think i changed my cam choice. after talking to Jon@Texas-Speed, i decided on the 231/236 .641 .615 111LSA cam. going to be a much better choice.
now my next question is should i opt for a FAST 102/102 or would it hurt to run a stock LS3 intake with 90MM TB and 85MM MAF?
now my next question is should i opt for a FAST 102/102 or would it hurt to run a stock LS3 intake with 90MM TB and 85MM MAF?
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Verdad Gallardo i think i changed my cam choice. after talking to Jon@Texas-Speed, i decided on the 231/236 .641 .615 111LSA cam. going to be a much better choice.
now my next question is should i opt for a FAST 102/102 or would it hurt to run a stock LS3 intake with 90MM TB and 85MM MAF?
now my next question is should i opt for a FAST 102/102 or would it hurt to run a stock LS3 intake with 90MM TB and 85MM MAF?
__________________
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
2022 Cadillac Escalade 6.2L A10 S&B CAI, Corsa catback.
2023 Corvette 3LT Z51 soon to be modified.
Custom LSX tuning in person or via email press here.
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
2022 Cadillac Escalade 6.2L A10 S&B CAI, Corsa catback.
2023 Corvette 3LT Z51 soon to be modified.
Custom LSX tuning in person or via email press here.
Thread Starter
Joined: Sep 2005
Posts: 8,139
Likes: 10
From: Chillicothe/Lima, Ohio
thanks dude...BTW, im definately making a trip to Illinois when i get this bitch done...you better have yours done.
and no on the SD. i gotta make a trip cross country in this and i dont want to have to re tune it every 500 miles.
and no on the SD. i gotta make a trip cross country in this and i dont want to have to re tune it every 500 miles.
http://www.google.com/search?q=LS3+M...w=1366&bih=643
It does bud...if you get a good tuner you won't need to get retunes. The Chrysler srt8's all are on SD tunes. I'm sure a good tuner has some files that can be uploaded to your PCM. My buddy chris1313 is on SD on a stock bottom end making 522rwhp on speedinc's dyno and he drives his car everywhere no problem. Call some tuners up and ask.
Last edited by litle88; May 25, 2011 at 02:48 PM.
lol why cant you run closed loop in SD?? i keep hearing this over and over, people seem to think you can run SD in closed loop.... i do it all the time, and i quite prefer it that way... the mostly the only time i dont run closed loop is if the car runs leaded race gas, or its a turbo deal and retard who designed the kit put the o2's before the turbo