But Mad North-Northwest
Join Date: Sep 2003
Location: SF Bay Area, CA
Well, Mario's talking about the S3 plenum ground and you're talking about a ground to the valve cover/head, I think, Sicilian. I could see how the plenum could wind up electrically isolated if it didn't have a ground strap. Not sure how the head could: it should be well grounded through the head studs.
Still, adding grounds can never hurt anything. Did you actually see an improvement in something by adding the extra cable?
1963 Giulia Spider (1750 engine)
Former: 1987 Milano Gold