I recently bought a set of 799 heads to put onto my 4.8 to go with my Nnbs intake and wanted to know how much I should mill them and what head gaskets?

I asked over on the fb group page and generally .030 was recommended. Thanks In Advance

 

If you go with a thinner head gasket it will cost more than a stock set of gaskets.

Stock gasket thickness is .51, which is $35 for LS1/LS6 MLS 5 layer gasket. GM part number 12610046

If you are paying already to have them milled just mill to your desired CC chamber which will also decide your compression ratio.

What year truck?

Typically heads are milled .030 to achieve roughly a 61cc chamber on 799/243 heads, in order to make them equal to a stock 706/862 head.

 

Thanks for the info it's a 2004 4.8 single cab so far it's just got gears/posi longtubes 3200 stall and a custom grind 214/218 55x lift cam.

What should I be aiming for to work well now and maybe be able to use with a procharger set up In the future ?