New or used LS6 heads?
New or used LS6 heads? My friend is going to check out some LS6 heads tomorrow and I'll be going with him, but I wanted to know what we should look for. He said they're brand new never used. He wants $400 for them. How can I tell they're LS6 heads and if they're new? Will it say 243?
Last edited by SSmokin99; Apr 21, 2010 at 08:41 PM.
It will say 243 on one of the corners under where the valve cover goes. If theyre used, you will probably be able to look on the bottom surface of them and see an outline of the head gasket, unless its been machined.
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LS6 243 SPM Cast which is said to produce a little more (5~7hp) over the non SPM castings, you can google it, SPM cast heads are supposed to have more consistent, smoother runners becuase of their casting process, you can tell they're SPM heads by the triangle's by the spark plug holes
Not really worth more money if you're looking to sell, however the method that was used in the casting process was more consistent and smoother which resulted in a few extra ponies thus making this the more desirable type of head if you're going to be buying a used head. Kinda like the 01-02 Fbods that came with the LS6 block, some guys look for it but it's really not worth any more than LS1 block car, no "said" performance difference. Hope this helps
243 heads are just that 243 heads which is a casting number like 799. what sets the heads apart are the valves and the flow which they flow very well for stock castings. The valves are the most important part of the equation if you are looking into reving your engine past 6500 rpm and have great stability in your valve train. You can buy a set of 243 heads and not be an LS6 set up hence the 799s set up which come in the 05+ Corvettes. Now you will get some 243 heads on some 05 Corvettes yet they do not have the LS6 set up. What you want is the whole set up heads, valves and get the corresponding springs to use with your particular cam and set up.
Good Luck
Good Luck
The earlier years dont have the sodium filled valves, I know 01's dont for sure. Im not sure exactly which years got the sodium valves. Maybe someone can back me up on this. Not trying to sound like a know it all lol.
What I meant by "LS6 heads" was its the LS6 casting. Not necessarily with LS6 valvetrain. The heads in the pic COULD be LS2 heads, but I think they are the same thing, so it doesnt really matter.
Ive never heard of SPM heads though. Learn something new every day lol.
What I meant by "LS6 heads" was its the LS6 casting. Not necessarily with LS6 valvetrain. The heads in the pic COULD be LS2 heads, but I think they are the same thing, so it doesnt really matter.
Ive never heard of SPM heads though. Learn something new every day lol.
Last edited by BlueBird346; Apr 22, 2010 at 12:35 PM.