which year model cars w/ 243 heads had the good valves
Thread Starter
Joined: Apr 2004
Posts: 1,380
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From: Atlanta, GA Ft. Walton Beach, FL
which year model cars w/ 243 heads had the good valves which year model cars w/ 243 heads had the good sodium valves?
and which year model cars w/ 243 heads had just regular valves?
I did a search .
Thanks
and which year model cars w/ 243 heads had just regular valves?
I did a search .
Thanks
Obviously you didn't search very well. 
Anyway, 2001-2004 LS6 (not sure if only ZO6 or also CTS-V) had the light weight sodium filled valves, while the 2005+ LS2 (Corvette, GTO, TBSS, etc ...) had the standard valves. All of these had 243 heads.
Anyway, 2001-2004 LS6 (not sure if only ZO6 or also CTS-V) had the light weight sodium filled valves, while the 2005+ LS2 (Corvette, GTO, TBSS, etc ...) had the standard valves. All of these had 243 heads.
Thread Starter
Joined: Apr 2004
Posts: 1,380
Likes: 14
From: Atlanta, GA Ft. Walton Beach, FL
vette I was thinking only the newer Vettes had the prefered sodium valves
and the other 243 headed cars where just regular valves
posting because I'm
am unsure.
Thanks
and the other 243 headed cars where just regular valves
posting because I'm
am unsure.
Thanks
01 Z06 had regular valves. 02-04 Z06 had the sodium filled/hollow stem valves.
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Thread Starter
Joined: Apr 2004
Posts: 1,380
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From: Atlanta, GA Ft. Walton Beach, FL
valves I'm assumming that the sodium filled valves are lighter reducing the the force it takes for them to go up & down so you get more power w/ lighter valves?
is this the reason to get sodium filler valves?
so the 243 w/ sodium valves stops at 04 Z06 because the 05 had LS2?
Thanks
is this the reason to get sodium filler valves?
so the 243 w/ sodium valves stops at 04 Z06 because the 05 had LS2?
Thanks
But without the sodium filled/hollow stem valves.
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Verdad Gallardo Thread Starter
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From: Atlanta, GA Ft. Walton Beach, FL
2.02"/1.57 valves I was planning on PRC 5.3 2nd stage heads and just doing a 243 sodium valve swap into the 5.3s.
since the are the same size 2.02"/1.57
will these valves be better (meaning more power) in the 5.3s compared to the regular valves that come w/ the PRC 5.3s?
Thanks
since the are the same size 2.02"/1.57
will these valves be better (meaning more power) in the 5.3s compared to the regular valves that come w/ the PRC 5.3s?
Thanks
The valves themselves are a little longer, so you'd need shorter pushrods. They aren't worth swapping really.
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hmm --JMarsa
this is why people who use the LS6 cam in their other LS engines they need longer pushrods. The LS6 has teh same pushrods as any other LS, but a smaller base circle cam and long valves. Using either the valves or cam without the other requires a diff length pushrod
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On The Tree
Joined: Feb 2008
Posts: 111
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From: Nederland, TX
my thoughts on the Na valves are that they are a little lighter, therefore you have better valvetrain control.. hence less chance of float and less wear and tear on other valvetrain components. i doubt you will see much if any hp difference.
Per the other post further up, the 02-04 LS6 based C5 Z06 does as well.
-Chris
Careful what you define as "better".
Do any serious spring work and the seat pressure goes through the roof which can snap the heads off the hollow valves. No one that does serious drag racing uses hollow valves. Use the solid valves and buy some good springs that will allow you to run 300+ spring pressure when seated - no valve floating issues and more power. The rest is just snake oil.
Do any serious spring work and the seat pressure goes through the roof which can snap the heads off the hollow valves. No one that does serious drag racing uses hollow valves. Use the solid valves and buy some good springs that will allow you to run 300+ spring pressure when seated - no valve floating issues and more power. The rest is just snake oil.
The best thing to do is to simply find out what they came off of. There are far more regular 243s out there than LS6 243 with sodium filled/hollow stem valves. They will make just as much power, but if you get high spring pressure as noted above you can have a problem with the "better" valves. Standard LS2 style 243s are probably the more desirable for most applications.
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You'll be fine.
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