I am about to remove the heads on my 2008 5.3 aluminum flex fuel to install LS7 lifter kit/trays to remove the entire AFM/DOD system, using the LS3 valley cover.

Since my heads are coming off, is it worthwhile to have the heads milled for added compression? Will this cause any problems with quench area? I am willing to install shorter pushrods.

They are 243's.

If "yes" to milling them, how much?

I am planning to use factory GM gaskets, not Cometic. Cometics are too expensive.

TIA

 

big bump im doing a full port and polish with valve job some time in march and was wondering about milling as well i was told 20 to 30. but i dont know what that will get me at. i wanna be at 10- 10.5

 

.045 but stay away from nos,s/c,turbo if you do, should get you close to 11.1 compression.

 

can some one tell me the formula for finding compression or know of a link. so .45 should be around 11:1 on and 08 5.3