Big Block Motor Mounts on the cheap.

[Tx Firefighter]

All right fellers, some folks have requested that I do an FAQ on this.

Here's the skinny,

There are 2 types of factory big block mount setups for 67-72 trucks. The first type is 68-72 and real common. The other type is 72 only.

The 68-71 type use a real cheap frame stand. Usually available on the parts board for 60-100 bucks per pair. The downside to these is the rubber motor mount part costs big bucks, real big bucks.

The 72 setup will cost you at least double to buy, but the rubber mount parts are real cheap to buy.

It's all a trade off you see?

Here's what I have done and am currently doing on my 70 truck.

First, buy a set of the early (68-71 type) frame stands from the parts board or ebay or whatever your favorite is. Then, buy a pair of 67-72 truck small block motor mount rubbers. These small block rubbers should cost about 15 to 20 bucks per pair, which is like a zillion times cheaper than big block rubber mounts. Available in any store too.

Install the big block frame stands into the frame holes and bolt the small block rubber mounts to the big block engine. They bolt right on. Now, you need two real big burly washers. I use harmonic balancer bolt washers. They have the little hole in the middle, yet are big and thick. You need these because the bolt holes in the big block stands are very large and the bolt in the small block rubbers is small.

Now, drop the engine in and bolt it down.

You have like 50-100 total in your BBC mounts now, instead of 200 plus like normal. And, if you ever need new motor mounts, you will only be out 15 or 20 bucks to buy the generic SBC ones.

Yes, I have done this several times before. It works and works well.

Also, you must run the big block frame stands with a big block, there's no getting off cheaper by substituting small block or inline 6 frame stands. I have set the engine down onto small block stands before, and tried for months to find a header or exhaust manifold that would clear. The BBC mount stands have a dish in them for manifold clearance that SBC ones don't.

First two pics are a 68-71 big block frame stand. Note the dish for manifold clearance and the big hole in the middle where the washer must go when using normal small block rubber mounts.