Anyone know the average flow data for a stock ls2 243 cylinder heads....? gunnar from patriot heads told me in the 240cfm range on the intake side.... and also the size of the CC.

 

I believe Gunner is correct. Typicially 245ish, and small 200cc's.

 

CC-cumbustion chamber....sorry for the confusion, i have a chance to get a set of old 806 patriot heads that i guess according to his site flow 290's....how much better is that? and im not sure the size of the combustion chamber so i dont know if its going to raise my compression.

 

CC Chamber size should be 62
CC for intake should be 200 or 205
flow sounds correct (240 to 250 on average)

Stock LS1 heads are 64cc chamber size if I'm not mistaken and the 5.3 and 6.0 truck motors tend to have a chamber size closer to 70cc

Head spec's for the LS2 crate motors from GM's site.
http://www.gmgoodwrench.com/GMPerfor...input=12564825

I do believe GM typo'd on the site as they listed the intake port at 250cc (someone got dislexic as it should say 205).

 

hmm well GM parts direct list the ls2 head as having a 210cc intake and a 65cc chamber.

Hmm GM Parts direct or GM performance take your pick.
http://www.gmpartsdirect.com/results...ges=1&pkgid=55

Hmm page 2 of the heads listing at gm parts direct list's a bare CNC ported LS2 head with a 250cc intake runner...

so depending on who you go by and which part number you get ahold of...

You could have one of the follwoing:
210cc intake and 65cc chamber (gm parts direct listing for ls2 head)
250cc intake and 65cc chamber (gm parts direct listing for CNC LS2 head)
250cc intake and 62cc chamber (gmperformanceparts listing for ls2 crate motor).

Heck now I'm confused

 

or if you really want to get information on LS2 heads go look at the GMparts pdf
http://www.gmpartsdirect.com/attachm...talog20063.pdf
page 188 gives a simple break down... hmmm I need to quit looking at gm parts for the evening or I'll end up buying something that I don't need/can't afford.

 

The LS2 has 64cc chambers and the runners will be 210-215cc.