LLY: Head gaskets

Slowmax

Build what others' won't
Aug 3, 2013
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Go to your local GM dealer and order a set for a LML Grade c. Or here are the Mahle part numbers #'s.
54585 left
54582 right
 

thunder550

Active member
Apr 2, 2013
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Phoenix, AZ
It refers to the thickness. Grade A is the thinnest, then B, then C. People generally go with the C's since they usually have a little bit of material taken off the heads when they are worked over. From the factory, the gaskets are matched to the engine (I think due to piston protrusion or something like that, not exactly sure), and each engine might be different. For example, mine came with an A on one side and a B on the other. Since I didn't have my heads machined the first time I did the gaskets, I matched what came on the engine, A on one side and B on the other. This time I'm going to have them machined, so I will likely go with C's.
 

thunder550

Active member
Apr 2, 2013
1,176
16
38
Phoenix, AZ
Depends on what you have planned for the truck. If you're going to keep it stock then GM head bolts should be fine. If you are planning on modding, running hotter tunes, etc, I'd recommend doing ARP studs.