Originally Posted By EV2RUNNER
The head is bolted straight to the block?


Yeah but...
The head and block float above ground..
They are isolated from being a solid, reliable ground as the 12V must try and flow through rubber insulated motor mounts to the car frame. A DIRECT grounding strap from the engine to the frame and/or firewall assures a solid ground connection.
Keep in mind, the starter draws > 100amps and without a solid ground for the 12V- other problems can/will happen..

Just my $0.02.... wink