The only grnds atm is a 4awg eng to bat attached to head and a 10-12 gauge from bat to rad/core support. I've been meaning to upgrade by adding a chassis grnd from bell to frame. Not sure if my head is a good grnd since its only grnding through the head bolts, dowels, and I guess pushrods. Not to mention the cable bolt is only making contact with threads since I didn't want to scrape of paint. I spent a lot of time/money preping and painting the motor and didn't want to compromise protection. I figured 1-1.25" of threads would be sufficient contact. I've been meaning to at least put a star/spur type washer under the cable.
So is the head (w/ star washer) good enough despite the only connection being head bolts and dowels or should I add a chassis gnd from bell to frame? I could see it helping other areas like lights and dash etc, but not sure if it'd help my ign issue.
The MSD box is hard wired straight to the bat both +/-. IIrc only wires going to coil are orange and black from 6al, so I guess coil grnds to the box. Not sure what could really be impeding continuity.