Quote Originally Posted by xlr82sxs View Post
what's stock compression on a l59 5.3 allen?

..and what kind of gains will i see from these heads on a stock 5.3 with lt headers and ory? i plan to go with a 218/224 high lift cam in the future as well.

I used to know all the specs, but somehow I forgot, lol.

It's around 9.1 or 9.5. I think the 6.0L is 9.1 and the 5.3L is 9.5.