on a theoretical scale.. yes. on a practical scale, maybee, IF a front mount. on a side mount.. very little practical difference.
here's the deal.
positive ground.. center electrode in the spark plug is negative.
electron current flows negative to positive ( electrons have less mass than protons! )
that means the spark actually jumps from the center electrode tot he positive outter ring and / or lil feeler on the tip of the plug.
now.. a little electrical phenomenon called thermionic emission ( google edison effect ) means that it is easier to 'boil' electrons off a hot surface vs a cold surface.. thus it's easier, on a theoretical scale, to boil electrons off that hot center electrode as it is insulated from the head sink of the block via the insulator.. heat range of the plug will be determined by insulator, and plays a roll. also easier to get he spark to jut from the flatedge at the side of the angle.
all this means is that positive ground throws sparks off the center electrode a hair easier than negative.
that said.. a good negative ground setup will be fine. by the time HEI came out.. the small theoretical micor percentage difference in positive or negative ground was meaningless.
one more issue.. coil polarity. there is a low ohm primary.. say 1-3.25 ohms.. and a high ohm secondary.. say 4k ohms
when wired with incorrect polarity you have the issue of a large resistance plus a small resistance in the circuit.. again.. it's a REALLY SMALL difference.
front mount coils , due to their physical structure, cannot be reversed to run at correct polarity for negative ground. round coils can. thus on a front mount that was 6v.. I'd run it positive ground for 'best' results. best spark.. best arangement of secondary on coil.. etc.. etc.
that clear it up any
ps.. you know you are in trouble when you ask an engineer to explain something
