Big block motor mount confusion

[St Cloud Rustoms]

63 GMC 1000

Well, I thought I was getting the right 73-87 clamshell mounts, but maybe I got the wrong ones. I've seen some posts about having to add a 1" spacer under the frame side on some, but I thought I was getting the right ones that don't need the spacer. Can anyone tell where I went wrong?

I also have a set of small block mounts, but putting them up to the frame make it look like I would need a 1" spacer as well? I'm kinda confused.

[Captainfab]

Did you get your '73-'87 brackets from a C10 or a C20/30? If from a C10, that is part of the problem. Those are longer than the C20/30 brackets. You may still need a little spacer if you move the engine forward much.

[St Cloud Rustoms]

I guess that's where i might have gone wrong. They weren't out of a c20/c30.

Even matching up the small block mounts that were out of a 67-72 c10 don't look like they'd work. Matching up mount placement and angle, it looks like I would be in the same scenario.

Another issue that I'm seeing is that as it sits now, if i used the 73-87 mounts with a 1" spacer on the frame side, my oil pan would hit the ground before my frame / crossmember.

I think I'm going to need some after market mounts that lift the motor a bit. Any options or input?

Thanks

[shortstep60]

I used 1970 bbc motor mounts on my 65 and it fits nice. I do have some bbc mounts on a c20 1978

[St Cloud Rustoms]

Originally Posted by shortstep60

I used 1970 bbc motor mounts on my 65 and it fits nice. I do have some bbc mounts on a c20 1978

Any chance you could post some pictures so I could see fitment?

[Captainfab]

There are several pics in this thread.

http://www.67-72chevytrucks.com/vboa...d.php?t=551120