lq9 vs ls1?
10-03-2005, 06:00 AM
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lq9 vs ls1? i am looking to get some heads for my 5.3l, i can find the 6.0l lq9 heads cheaper than the ls1 or ls6 heads. does anyone know the major diffrence, or which one would be better?
Last edited by peppersac; 10-03-2005 at 04:37 PM.
10-03-2005, 04:56 PM
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The deck of the 317 (LQ4/LQ9) is a little thicker to yield a combustion chamber of that is about 72 cc's rather than about 60 cc's (as I recall) for the 243 LS6 casting. Otherwise, they are virtually the same. Since you are running a supercharger with 6 PSI of boost, I'd recommend the 317 castings and keep your static CR about 9.4:1. That way you won't have such a problem with detonation under boost. The valves and flow rates for the two heads are very similar.
Steve
Steve
Last edited by Steve Bryant; 10-03-2005 at 05:10 PM.
10-03-2005, 10:18 PM
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Originally Posted by Steve Bryant
The deck of the 317 (LQ4/LQ9) is a little thicker to yield a combustion chamber of that is about 72 cc's rather than about 60 cc's (as I recall) for the 243 LS6 casting. Otherwise, they are virtually the same. Since you are running a supercharger with 6 PSI of boost, I'd recommend the 317 castings and keep your static CR about 9.4:1. That way you won't have such a problem with detonation under boost. The valves and flow rates for the two heads are very similar.
Steve
Steve
