I can get a set of 6.0 heads for cheap. I plan on getting them port and polished and a valve job. I heard that the combustion chambers were little bit bigger than my 5.3 heads which will lower my compression. If this is true will buy the heads and run a little more boost. I was wanting to know if this was true or not and will appreciate any help or tips from anyone who has done this before.

 

5.3 heads=61.15cc
6.0 heads=71.06cc

The 5.3 and 6.0 intake valves/runners are different too, 1.89"/200cc vs. 2.00"/210cc respectively. Bigger valves too.

 

cheap *** buy them and give them to me

 

That's what I did to lower the CR on my 5.3L... I think we figured it out to drop my compression to about 8.6:1 with the GM gaskets.