my truck smokes at start up and was told it might be valve seals. so i was thinking about bolting my 6.0 heads that have been p&p and sticking a tr220 in my little 4.8. i was wondering if its worth it or not? im gong to shave the heads as well. i want to know would it be worth the trouble of the swap. all i have to pay for is thr bolts and gasket kit.

 

you will drop compression severly..unless you are boosted stay with the 4.8/5.3 heads

 

save the 6.0 heads for a better project.
get a set of LS1 heads, they have the same size ports
and valves, plus the combustion chamber is a little smaller
to raise compresion.

 

LS1 heads have larger chambers than 5.3 heads (67cc v. 61cc), and larger intake valves, but according to smokemup, they flow almost identical.