head gasket?
#5
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i went with cometics. i think they're some of the best and some say reusable .... have a lot of different thicknesses also. also no cleaning if you take them off like the stock graphite mess.
#7
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If you aren't having the block resurfaced then GM MLS is more forgiving to imperfections. The cometics require a flat surface and specify an RMS range for the machined deck finish. Most people use them without issue, but a few have had sealing problems. With your cam you really don't need a large bump in compression to achieve optimum results, so I say mill the heads to 59cc and run the GM MLS.