Thinking about LS6 heads and TR220 in my 5.3.
 

As the title states, any suggestions. I'm pretty sure I need to mill the heads, but I don't know how much looking for a 10:1 cr. has anyone ran this same setup, if so what gains did you see. Also considering punching the block out to 5.7. Any feedback is good feedback.

More cubes will always help!!! Mill the ls6 heads around .30. maybe even more then that not sure.

check out this link. i had asked a similar question and maybe the replies in this thread will help. https://www.performancetrucks.net/fo...d.php?t=393956

That thread cleared up alot, i need to talk to my head guy.
Anyone have any #'s from this setup????

WCCH any comments? Recomendations?

I know someone with that set up, he milled the heads .035 to bump his comp. up.... according to the SOTP test, he says its feels good, but no numbers out yet...

i was gonna run a 383 stroker out of my 5.3 and keep my stock 5.3 heads and have them ported and milled .010....if i remember right this was gonna give me close to 11.0 to 1 wich is a little more than your lookin for but you can still run pump gas on it!!

My WCCH 5.3 heads are done but I'm going on vacation so I cant' get them on for a couple of weeks. They are ported and milled .030. Richard said this would yield around 10-10.25 CR.