LS2-LS3 compression ratio
#3
#5
On The Tree
Join Date: Dec 2007
Location: akron ohio
Posts: 182
Likes: 0
Received 0 Likes
on
0 Posts
![Default](https://ls1tech.com/forums/images/icons/icon1.gif)
The ls2 stock with 243 heads is 10:9:1. The ls3 with stock 821 heads is 10:7:1. A ls2 with ls3 heads will drop down to 10:4:1 due to the 70cc chambers in the ls3 heads. If you mill them you can retain stock ls2 compression but it will kill you ptv clearance.