Big block motor mount help
 

O.K. guys, i need a little help here. I'm not sure how to explain this. I've got a '71 Short fleet that had a small block and 3 speed in it. I took it out and i'm putting in a 402 and 700r4. The po had welded newer style motor mounts to the frame to install the small block. It fit fine and was running when i got ahold of it. The big block will not fit in the small block location now. I think the po had welded the mounts back to far. The mounts needed to come forward about 3 inches or so. I cant get the 402 back further towards the firewall and its not even close to resting on the mounts. Do i need to cut off the po's mounts? I see some people are using tubular mounts that look pretty cool, but where are they getting them from? I would like the original ones, but the po welded up the holes for the mounting, and i can't see spending alot of $$ for factory style mounts. I wish i'd took a pic to explain this a little better, but didn't have my camera. Here's a pic of them before i tried to put the motor in so you can see what they look like. Thanks for any help!!Attachment 389833

Re: Big block motor mount help
 

Ok, I cant tell exactly from the pic. But, it looks like he welded (wtf..?) the top of the mount somewhere between the two factory mounting holes.

The rear holes are for mounting I6's, but are somewhat frequently used for mounting SBC's. I thought a lot about trying to use the rear holes on my 496 project, but that is some serious work.

It looks to me like you have 73-87 SBC towers which will work just fine. There is a faq on the board about how to convert them. I'll look it up for you if you like.

I used them on my 72, and it worked, but I wasnt happy with the result at all. The motor sat a few inches too high and up at a slight angle
http://img.photobucket.com/albums/v4...u/S5000347.jpg

http://img.photobucket.com/albums/v4...u/S5000346.jpg

http://img.photobucket.com/albums/v4...u/S5000352.jpg

I've since bought the correct 72 only mounts incase I ever want to sell it.

You can get 67-71 BBC mounts and towers quite cheap.

you asked about these:
ttp://www.performanceonline.com/sto...cat=455&page=1

Re: Big block motor mount help
 

Thanks for the pics. Mine looks very similiar to yours, only mine look like they were welded in the I6 position for whatever reason. Looks like i'll be grinding off some welds tomorrow. Thanks for the info on the tubular mounts also. I've gotta decide on which way to go now. By the way, what is the difference between small block mounts and big block? Does the big block sit lower in the frame? Can i use small block mounts with the big block?

Re: Big block motor mount help
 

I used the Performance Online dot com tubular big block mounts. They're very well thought out, and fit perfect. Very satisfied, and they're urethane vs. rubber, too.