I always move the batteries to the trunk in my cars and run two #1 copper cables full length to the starter and ground location. I have grounded to the head boss on my aluminum heads and when freshening up the engine after 7 years, I noticed that the water passages in the heads, showed some signs of electrolysis, not bad, but more than I would have expected for as little the car is used. This is an iron block/aluminum headed 528 Hemi. Should I be attaching the ground cable to the iron block instead of the heads? Does grounding thru the head aggravate the electrolisys?
Thanks!