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Message: <blockquote data-quote="Chip66" data-source="post: 1493908" data-attributes="member: 23618">The best lobe separation angle is a product of displacement, compression ratio, and intake valve size.    The best LSA has nothing to do with duration or lift.  If you go too big on LSA you are wasting power across the board.   As compression ratio goes up on an engine so should LSA.  Add boost, LSA should go up.I higher ratio rocker changes the valve event timing slightly.  You don't need to change the LSA, you may need to change the cam timing to compensate. Odds are high that straight up on any cam out of the box is not the best timing for the cam.I haven't seen anyone explain this better than David Vizard.  He's tested 1000s of cams on the dyno.[MEDIA=youtube]goQAdAHngzg[/MEDIA]For a small block ford at 10.5 CR the formula would be:LSA = 127-(CID/# cyl/V dia x 0.91)If you want the best cam spec for your engine, get David's Torque Master program.  <a href="http://davidvizardperformanceseminars.com/torque-master-software.php" target="_blank">http://davidvizardperformanceseminars.com/torque-master-software.php</a></blockquote>