What size are the combustion chambers??

 

these are already posted on ls1tech.. most of the interest is coming from there as well.

 

62.5cc i believe..

 

So you'd have to mill them a good bit to get the CR up on a 5.3?

 

Up to what? They are speced to be 10.75:1 on a 5.3L
http://www.texas-speed.com/shop/item...id=84&catid=40

 

i've been told different things by a lot of different people.. some say it will bump a 5.3 to 10:1 cr, some say it will stay the same but these heads will flow better since they've been ported and have larger valves.

 

that's on a 5.7 ls1.. just fyi. they don't say it, but i found that out after purchasing these heads.

 

Oh well that is just **** poor advertising by Texas Speed then...
On the verge of false advertising on their part I would say.

 

considering how they rape the hell out of everyone with fees, id tell them to stick that policy in their ***.

 

They would probably drop the CR a tiny bit if you put them on a 5.3 or 4.8 and didn't have them milled.