Yup and my stock 243 heads are cathedral shaped intake ports. Gm parts shows the same part# intake manifold for the 5.3 with 243 heads and the 6.0 with 823 heads. My question should have been how can one manifold fit two different shaped ports?

 

They look diff to me

 

Sorry I should have noted that I looked up the parts for my 2008 5.3L and for my recently purchased 2008 6.0L

 

That is 08. it says 10-11 because they changed pn but those are the manifolds.

 

I'm curious where you got this information? I have checked a couple different gm parts links and none showed your part numbers

 

Both those numbers are valid GM part numbers, they come up as 2 different intake on gm parts direct.

Also through summit racing.

https://www.summitracing.com/parts/ADO-12597600

https://www.summitracing.com/parts/ado-12638038

 

Special access ;-)
You just have to know how to search i guess. Quite a few gm callouts wont list for a chevy so swap over to gmc etc and if it says #500 and there are 2 or 3 #500s then you have to sift through comments and look for rpos et to make heads or tails.
I can say with 100% certainty there is no gm intake that fits both heads. Its not physically possible.

 

Thanks for the information. I looked up a 2009 Sierra 2500 6.0L and the part number is what you gave me 12597600. GM parts direct shows the same part# heads for both the 2008 and 2009 but two different part#'s for the intake. I wonder if some 2008 trucks had the wrong intake on them or is that just a parts mess up?

 

Could you please give me the correct Part# intake gasket for the 12597600 intake? And do I need a quantity of two or just one for the gasket?

 

19207929 is the gm pn. We have em on an large stock order coming in. $35 shipped. order qnty 1.
Basically all the truck intake rec port gaskets are the same whether 6.0 or 6.2.