Camshaft Question

[HooptieWagon]

1. Greater lobe separation is less overlap....

Overlap is the period where both valves are slightly open. Overlap helps scavange the exhaust gases. Less overlap helps build combustion chamber pressure. Generally, low compression ratio and low RPM likes to have short duration intake and exhaust, and little overlap. High compression ratio and rpm like longer duration and more overlap. There won't be a big differrence in lobe separation, just a few degrees.

I assume intake centerline is the point of highest lift.

Go with what the cammaker recommends for a racing motor. Go with what they reccomend for a street motor, too. Thats probably a little milder than what you think. Street motors spend very little time at 6000 rpm, and too big a cam isn't fun at 2000 rpm and sucks gas.