Nice info, looking for heads soon myself.

 

On the 2.5 heads what do more people run the 5.3 or thew 243s?

 

i will have a set of PRC 5.3 2.5s forsale soon

 

are you leaving the 317s on the new 6 liter?

 

Yep, for now, i want to get a set of the PRC 243s

 

what kind of compression are you going to have with the flat tops and prc 243s? Id guess around 11.0-1?

 

that is what i want to shoot for, 11:0-1 usiing stock height headgasket . My current PRCs are milled down to 58cc, which with a .06 headgasket would put my CR at 11.5:1.... That is the main reason i am going to sell them....

 

mine are 60cc on my ls1, i think mine CR is 11.3ish:1

 

they come 62cc stock from PRC correct? I know yours have been milled.

 

I bet you'll be in the neighborhood of 11.0 or better (CR) with these bad boys.
Definitely look into an XER lobe camshaft.
Does your current intake match these heads? I could have sworn the 5.3 heads are cathedral port?