I guess thats why i took a factory 454 out and put in a 350 there were different mounts
Now the truck i did that on was 2wd but there was a for sure difference.
As a matter of fact when i tryed to sell the mounts some know it all popped in on how i was trying to rook people advertising them as BB mounts and there wasnt a difference.
\ But in the end after calling some dealerships the guy ended up buying my stands so he would have the right ones for his conversion.
Not sayin one wont work for the other but there is a difference and i belive it is in the height of the engine .
that the "frame side
mounting pattern on 1 tons originally equipped with the 454" are different. All others are the same.
When i swapped over to a SB i had to redrill the bottom hole when i changed over to SB Stands.. I Guess The ClamShells Are The Same But There Is A Noticeable diff. in the stands. my trans never moved for the swap and im running the same BB exhaust on Factor Sb Ex Manifold Stainless Headers