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post #1 of (permalink) Old 08-16-2001, 10:30 AM Thread Starter
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Question about motor mounts?

Well, I was always under the impression that small block mounts would work on a big block if the truck originally had a small block in it. So I went and got some small block mounts (I forgot to take them off the 350 I sold!!!) anyway, I got the piece (cup) that bolts to the frame and the pivoting piece that bolts to the frame. Anyway, the mounts bolted to the frame alright and the cup bolted to the block great. Problem was when I went to lower the engine onto the frame. The engine is sitting up to high and I can't drop it down farther because the mounts are already wedged up agains the cross member part.

From what I can see the big block "cups" arn't as deep as the small block mounts because the big block is a few inches wider than the 350.

Am I totally wrong here or am I just going to have to go and buy BBC mounts instead in order to put the engine on the frame?

Thanks...Ryan

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post #2 of (permalink) Old 08-16-2001, 10:35 AM
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Re: Question about motor mounts?

never done a big block swap, but have a done a few v6-v8 swaps and to my knowledge chevy really basically only makes two motor mounts. V8 and V6.

I could be wrong. Make sure you have them on the right sides though, because as I remember they are specific to drivers-pass side.

Later,
Shaneb

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post #3 of (permalink) Old 08-16-2001, 10:47 AM
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Re: Question about motor mounts?

forgot about 307's. All v8's are the same(BBC and SBC) but the 307 mounts are different, other than that its swap away.

I thought the 4.3's were the same as a v8? must be mistaken.

83 1/2ton 350 700r4 soon to be bigger
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post #4 of (permalink) Old 08-16-2001, 11:06 AM
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Re: Question about motor mounts?

From what I have read at CK5 you will need BBC mounts.
When I rebuilt the BBC in my 73 I dropped in a SBC so I could drive it and the SB went in with no problems.
Soon I will be swaping the SB out of the K5 and putting in a BBC so I am kinda needng this info too.

post #5 of (permalink) Old 08-16-2001, 12:31 PM
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Re: Question about motor mounts?

Your right about the 4.3l motors. I should have clarified that the 60 degree v6's (2.8, 3.4) use a different mount.

Later,
Shane

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2000 Specialized Rockhopper FSR
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post #6 of (permalink) Old 08-16-2001, 08:13 PM
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Re: Question about motor mounts?

When I swapped from a 350 to a 454 in my Jimmy I used the same motor mounts. I plan to install poly mounts later.

post #7 of (permalink) Old 08-16-2001, 08:48 PM Thread Starter
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Re: Question about motor mounts?

Well, I am planing on making solid mounts for it anyway but I just want to make sure it fits and as of right now...its sitting 2" to high because the mounts are to big as in thickness wise.

RYan

93 GMC Yukon
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