8.1 engine mounts?
 

I removed my old 454 from my 72 GMC yet the engine mounts on the 8.1 are vastly different. I have found where people somehow used the old mounts with the 8100 vortec yet the engine mount bolt pattern on the block looks different for some reason.

Anybody know any really good engine mounts for a conversion like this? Possibly poly type? I can't find much info on the 8.1 .

Re: 8.1 engine mounts?
 

You might try member DirtyLarry. He has a 8.1 in his square body, which shouldn't be that hard to adapt to fit your needs.

Re: 8.1 engine mounts?
 

Yea would like to contact him, he has a picture of the old mounts on a 8.1 yet the mounting holes doesn't look the same as mine. I have a 04-06 model though, I wouldn't think that would change anything.

Re: 8.1 engine mounts?
 

Dirty Larry sez:

"The 8100 block has the same motor mount points as early small and big block Chevy's. Even the heads shared the same exhaust flange pattern. I was able to use a set of hedders from Dynomax and they bolted right up! A Turbo 400 bolted right up the 8100 and the torque converted bolted right up to the stock 8100 flex plate. Even a stock starter for a 1977 Chevy small block bolted right up, cranks over fine."

I'm not sure if they changed anything in the later blocks or not but I wouldn't think so.

I wouldn't use the poly mounts, they transfer too much vibration. The regular '72 BB clam shell mounts would be the best if you can find some.

LockDoc

Re: 8.1 engine mounts?
 

Not my thread but Thanks Leon.

Re: 8.1 engine mounts?
 

Hey, where's the smiley...:(... I didn't say "Other Larry" I said "Dirty Larry"....:)

LockDoc

Re: 8.1 engine mounts?
 

The 8100's were made for such a short period of time, unlikely that the block mounts were changed...just a thought...

now if we were working on a ford.......

Re: 8.1 engine mounts?
 

Checked again found out what the deal was, going to have to grind one down to match the others. Thanks for the input fellas!

Re: 8.1 engine mounts?
 

I bought the inserts Larry suggests for the clamshell mounts. We'll see how they work out.

Re: 8.1 engine mounts?
 

Let us know.

LockDoc

Re: 8.1 engine mounts?
 

I didn't even noticed the Larry thing the first time Leon.

There are so many of us we have to add a tag. :lol::lol:

Re: 8.1 engine mounts?
 

Here are the ones I bought, 3.1116R.

Re: 8.1 engine mounts?
 

Are these the BBC version? Because I was looking at the 3.1121R they list them for BBC however it almost seems like they are all alike.

Re: 8.1 engine mounts?
 

I thought they were, but I may have read it wrong. My truck has an L29 454 now and I plan on using the clamshells that came with it.