I have a set of the GMPP heads that have been cnc ported by LPE.... they have 58cc chambers and have double valve springs good to .650 with titanium retainers. just resurfaced and all new valve seals also already clearanced for big body rockers... First $925 gets em shipped and paypaled!!...

 

what would these bring the compression up to on a stock 6.0?

 

depends on what 6.0 u have. Either lq9 or 4. I was gonna ask what all did u have milled off of these to get to 58cc on these. And what compression u was at? Sounds like a bad *** set of heads.

 

i had them on my ls6... running mahle pistons .. was 12:1.. an LQ9 with these would be around 11.5:1

 

lq9. How would it run off pump gas?

 

pm sent

 

ran fine off 93 octane... i pulled them to go for boost on my motor... they pulled like a freight train

 

really nice heads, do you know the flow numbers?

 

Ive seen these charts range from 280 and 220 to 315 and 270 at .500...... hey flow well... also these were on my 2001 ls6 so they should have the lightweight valves

 

forgot to mention price includes paypal and shipping