[jhein]

Originally Posted by Jay S

If you make the cam bigger with more overlap, and at the same time lowering the dynamic compression, (which is what most bigger cams do) you basically are not changing the safe place for detonation. If you want to run more compression you have to move the cam events further apart, opening the exhaust valve sooner, and the intake later, with LESS overlap. The overlap build cylinder pressure. Pure stock you can move the LSA where ever you want, the wider LSA with more compression and less overlap out runs the less compression and narrower LSA most of the time with exhaust manifolds. Not always though.

Thanks for the excellent explanation. Trying to learn...