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Re: 72 Suburban cylinder head question
I don't have a clue about that casting number, but if it was running in the 80's it was on unleaded fuel. So if the seats look good then they are most likely a hardened seat of some kind. If they aren't hardened and look good then you may have a fresh valve job and are good for 30-40k miles at the least. If it was mine and the seats look good I would install some new positive seals on the valves and move forward.
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Thanks to Bob and Jeanie and everyone else at Superior Performance for all their great help. 
RIP Bob Parks.
1967 Burban (the WMB),1988 S10 Blazer (the Stink10 II),1969 GTO (the Goat), 1970 Javelin, 1952 F2 Ford OHC six 4X4, 29 Model A, 72 Firebird (the DBP Bird). 85 Alfa Romeo
If it breaks I didn't want it in the first place
The WMB repair thread http://67-72chevytrucks.com/vboard/s...d.php?t=698377
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