Thread: Question on Lobe Seperation.....

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Your compression is more due to the point of intake valve closure. On a tighter LSA, you will have more dynamic compression unless you retard the cam. Most are advanced. Here's a decent link to some Cam Tech.

On a 110 vs. 108 with same cam duration, power band will change about 300 RPM meaning it will come in 300 later and leave 300 sooner but will make more torque in the usable power band especially with handicapped heads, but you need a free flowing exhaust with the tighter LSA because it doesn't have the additional cylinder blow down that a wide LSA will provide with an earlier opening exhaust valve.