In Lamens...how long both int and exh valves are held open, helps higher rpm power, more o lap higher operating rpm...but it bleeds off cranking psi more o lap= higher rpm power/scavenging, less o lap...lower operating rpm range.
Typically , If you look at cam specs...smaller cam, less over lap...bigger cam more over lap
You are building a weekend cruiser, torque machine that wants a range like idle -5500 rpm...meaning torque range..it will rpm 'horsepower ' beyond that ..so dont trip out on the advertised peak rpm. How far beyond depends on a few things...but just stop over thinking it and dont put a big cam in it, if you do it will be like a fat woman climbing the stairs...overlabored
I partially was confused.. as in another thread someone was asking the same but more a towing deal, unless you edited the opening post and thats what happened.
Ive now changed my mind...put a .484 mp in it 4+ adv and live with it.
Good luck.
Now I see why others are tired of it.
