On the overlap,generally lower speed engines have less. And perhaps more likely is too avoid piston to intake valve interference on the 235 Chevy.
Do you think Delta ties out cams in running engine themselves or just copies older designs and customer feeback?.The old Howards M4F was a popular short overlap cam single pattern cam.
If you run down the cam specs from let's say Comp Cams for V-8's you'll see what appears to be the same specs for the various entry level performance cams be it a Chevy,Ford or Mopar. I gotta think the different head designs,stroke etc might demand engine specific cams for each type engine.But I guess it works good enough basic the street engine.
You'll also see dual and single pattern grinds offered with nearly the same specs for a particular engine. I suppose this fills in the blanks for particular tuning situations.
