Any explanation for the big jump?
What LSA?
The idea is to promote exhaust scavenging. In the stovebolts the combustion chamber is unswept. Holding the exhaust valve open allows exhaust gas velocity to empty the chamber.
Moreover, it's counter productive (for compression ratio) to open the intake too early or keep it open to long - hence the dual pattern.
(updated the '04 forums posting with links to the new home for photos - Isky description is there.) Should also say stick shift only.
Cam doctor says 107.4 lobe separation with 40 degrees of overlap at .020 and 3.4 degrees at .050.
