Big 3 Crimp ring size.

[z0n3d0u7 10+ year member]

I looked threw the Big 3 thread, Didnt see it mentioned. Does anyone happen to know if i can use 3/8" Crimp rings for my Big 3? My biggest concern is the bolt on the back of the head. Is it 3/8's?

Also, Would you suggest using bolts Clamping down Fuel / Brake lines good groundng points? Or should i Drill my Frame itself? What bolts would i use then? Would i have to tap the frame as well? I highly doubt there are Self Tapping screw's that will work, Or am i wrong?

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[andrew2944r 10+ year member]

If it don't fit drill out the center a bit, and don't crimp, Solder it...

 

[z0n3d0u7 10+ year member]

Do i need a torch to solder 1/0, or do i need a iron? Ive never been good at soldering.

 

[GreenBook 10+ year member]

I wouldn't use a screw that holds your fuel line for a grounding point, that just doesn't sound smart.

You need to use a soldering iron.

No one is going to know how large a specific bolt is on your car, it's your car not ours. But I can tell you that you can use any bolt on the engine, I myself just used one of the a/c compressor mounting bolts becuase it was smaller.

A self tapping screw should be able to cut through your firewall, just make sure you know whats on the other side if you decide to do that. Any bolt attached to body metal under the hood should work though. As another example I used the screws that held down my washer fluid tank.

 

[z0n3d0u7 10+ year member]

I was told it was a bad idea to ground to any of the sheet metal, Such as firewall, And inner fender.

Also, I have a 4th wire that goes from my alt bracket to ground. would that make up for my engine to ground, Or should i go ahead and do the one from my Head to ground as well? Ive already got the wire for both. The wire from my head goes to the firewall, But i was told to go to the frame.

 

[GreenBook 10+ year member]

I was told it was a bad idea to ground to any of the sheet metal, Such as firewall, And inner fender.
Also, I have a 4th wire that goes from my alt bracket to ground. would that make up for my engine to ground, Or should i go ahead and do the one from my Head to ground as well? Ive already got the wire for both. The wire from my head goes to the firewall, But i was told to go to the frame.

The firewall & Inner fender probably aren't the most ideal of gounding points, but they are still both welded to the frame and assuming you have good contact should work fine. Someone correct me if there is some safety reason I'm not aware of.

The alt braket to ground is the same thing as grounding the head to the frame, it's all one hunk of metal.

 

[99grandprixGT 5,000+ posts]

ya i had to drill out my ring terminals to fit my batter and alt post.

 

[x3ro 10+ year member]

The firewall & Inner fender probably aren't the most ideal of gounding points, but they are still both welded to the frame and assuming you have good contact should work fine. Someone correct me if there is some safety reason I'm not aware of.
The alt braket to ground is the same thing as grounding the head to the frame, it's all one hunk of metal.

The body being welded to the frame thing is only true if the car has a unibody support structure. If it's an older car, or a truck where it has a true separate chassis, the body would not be welded to the frame.

 

[Exo5168 10+ year member]

I did my chassis to alt on the inner wall, and it works great for me.