The spec I got were for the 305 at .050. The compression is 8.5:1 I thank you for your reply.To add a little more, the stock cam closes at14 degress after botton dead center but the overlap will bleed off a bit more compression at 109 lsa. So a 25 degree close and a 112 lsa with less overlap could have the same dynamic compression as the 109 lsa cam