Is the LS3 head the same as a L92 head?

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Oct 9, 2012 | 07:47 PM

duece67

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From: Muskegon

Is the LS3 head the same as a L92 head?

I have a 2003 LQ4 short block and a set of LS3 heads-are these compatable? Thanks

Oct 9, 2012 | 07:58 PM

Che70velle

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From: Dawsonville Ga.

Yes, they are compatible. The castings are the same. The intake valves are the main difference, with the ls3's being a tad lighter.

Oct 9, 2012 | 08:28 PM

Gray86hatch

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From: Battle Creek Mi

Casting is the same the intake valve is 20 grams lighter. This is a considerable amount.

Tim

Oct 9, 2012 | 08:50 PM

Che70velle

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Wow! 20 grams. I didn't realize there was a 20 gram difference. Have you verified this number yourself, or were you told this? That is a lot of weight on a valve.

Oct 9, 2012 | 08:57 PM

duece67

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Thanks for the info. Hey if valves are lighter would they be limited on spring pressure/cam selection?

Oct 9, 2012 | 10:19 PM

duece67

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Does anybody know if they're the same 823 casting?

Oct 10, 2012 | 07:58 AM

Gray86hatch

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From: Battle Creek Mi

The casting is the same # are different. I have had two sets of l92 and both had different # on them. I bought a set of replacement ls3.
I did weigh the valves 109 to 89.

Lighter the valve less spring to control it. I turn mine 7500 with the lunati spring kit and have not had any issues.

Tim