I am pretty new to all this, so I am sorry if this is a stupid question. I changed the cam in my Trans Am, and the stock lifters have started to go bad. I am getting ready to change them, and my question is this, what thickness head gasket do I need? I know that I want an MLS, and I want to pretty much stay stock, does anyone know the GM part number? Thanks for the help.

 

#12498544 Should be what your looking for.

#12498543 -LS1 5.7L GM Graphite Head Gasket 97-01 LS1/LS6 SOLD AS A SINGLE
#12498544 -LS1 5.7L GM MLS Head gasket 02-04 KIT W/ 2 HEAD GASKETS
#12589226 -LS1 5.7L GM MLS Head gasket 02-04 SOLD AS A SINGLE

Here is a little something I put together on the truck side...
http://www.performancetrucks.net/for...d.php?t=428941