Engine ground to chrome fuel pump plate vs. alum. head - Team Camaro Tech
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post #1 of 4 (permalink) Old Nov 29th, 07, 11:02 PM Thread Starter
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Engine ground to chrome fuel pump plate vs. alum. head

I have what might be a dumb question. I have a large ground strap on the front of my motor that I have run in the past to a chrome fuel pump block-off plate and attached the other end to my frame, near one of the motor mount stands. This has worked well and there are not any known problems. I'm putting my motor in this weekend (again...long story), and was wondering if putting the other end of the strap into the front of the nearby aluminum head is better. There is an unused hole in the lower part of the head.

I've never tried to weld chrome, so I was wonder if its a very good conductor vs. aluminum. What about gaskets ? There is a gasket with what might be permatex behind the block-off plate (I didn't install it), and the head has a gasket...

I guess the question is what component(s) are actually needing the ground and the best place/way to get it there: from the block or the head ?


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post #2 of 4 (permalink) Old Nov 30th, 07, 03:06 AM
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Re: Engine ground to chrome fuel pump plate vs. alum. head

Why dont you put it on the top of thermostat housing? And then the 2 Copper ground straps screwed into the firewall and onto the valve covers. Does that make sense?
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post #3 of 4 (permalink) Old Nov 30th, 07, 04:39 AM
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Re: Engine ground to chrome fuel pump plate vs. alum. head

Ground cable, as in battery cable, is best when connected to cast iron vs. alum.
You could use the front bolt covering the fuel pump rod.

A ground strap should be applied to cast iron as well vs. alum. You could use an engine mount bolt.

Ground straps to the valve cover bolts and firewall is a good idea, even through it is attached to an alum head, will work good. Just keep the connection clean as electrolysis is secretly working.

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post #4 of 4 (permalink) Old Nov 30th, 07, 10:21 AM
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Re: Engine ground to chrome fuel pump plate vs. alum. head

The only grounds you must have are A) the primary ground to the block, and B) the ground to the right fender. All other ground straps etc. were added by GM to try and keep radio noise under control - especially with AM radio. The primary ground to the block feeds the starter motor (highest load), and provides a return path for the ignition system (noisey). The fender ground is a return for just about everything else - lights, gauges, accessories...

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