Generation IV Internal Engine - L92 Casting numbers?



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Tigman
03-24-2009, 08:51 PM
I bought a set of used heads off of this site and when I recieved them they were 2 different casting numbers. Any problems with that?


Mark

cam75w/ls1
03-24-2009, 09:09 PM
Should end with 713 or 714. One part # means heads assembled w/ valves and the other w/o valves. This is what I ended up w/ from the GM Performance parts.
8ByGoat
03-24-2009, 09:09 PM
What are the casting #'s?

If one is 823 the other will not flow as good.

Tigman
03-24-2009, 09:12 PM
One is the 823 the other is 0821.

Thanks
8ByGoat
03-24-2009, 09:24 PM
One is the 823 the other is 0821.

Thanks

Measure the exhaust ports and look inside the heads.

I think you will see they may be finished differently.

FWIW 823 is the best casting #. I can't tell you what to do with those but there is a set of 823's on ls1gto.