Motor mount diffrences - The 1947 - Present Chevrolet & GMC Truck Message Board Network

C-10FREK · 10-14-2008, 11:51 PM

I am trying to figure out the diffrence between the motor mounts from a 78 with a small block vs big block mounts. The headers I bought say that I must use big block engine mounts. I went to carquest and looked it up the big block mounts have a diffrent part number, the small block and 250 and 292 has all the same part numbers. Can anyone tell me the diff??? Thanks

Jonboy · 10-15-2008, 08:51 AM

I am not really sure of the differences, but I think the BB mounts may be a bit taller. My 73 was a factory 454 truck. Somewhere down the line, the original engine was pulled, and a 350 bolted in. We pulled that out, and put a 454 back in, all using the original mounts. If they are much different, I would imagine it is pretty minor.

10-14-2008, 11:51 PM	#1
C-10FREK Registered User Join Date: May 2004 Location: ND Posts: 25	Motor mount diffrences I am trying to figure out the diffrence between the motor mounts from a 78 with a small block vs big block mounts. The headers I bought say that I must use big block engine mounts. I went to carquest and looked it up the big block mounts have a diffrent part number, the small block and 250 and 292 has all the same part numbers. Can anyone tell me the diff??? Thanks

10-15-2008, 08:51 AM	#2
Jonboy Slots go on anything! Join Date: May 2003 Location: Richardson, TX Posts: 5,957	Re: Motor mount diffrences I am not really sure of the differences, but I think the BB mounts may be a bit taller. My 73 was a factory 454 truck. Somewhere down the line, the original engine was pulled, and a 350 bolted in. We pulled that out, and put a 454 back in, all using the original mounts. If they are much different, I would imagine it is pretty minor.



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