Yeah that must be what the difference is. There was so much lore on the net about SBC and BBC mounts and if there even was a difference but there definitely is a difference
The sbc bucket mounts which attach to the block —mount holes are spread further apart than the bbc. these definitely will not work it’s about 3/4” - 1” further apart left to right than BBC. I have heard some guys have been able to get them to work so there must be some variation in design depending on year range. The ones I have will not work. Ain’t no way without modifying the cross member. Destroyed the rubber mount on the frame trying to get it lined up. The ORD mounts are well worth the price after trying to pry that engine into place for hours lol I could have got them to work by redrilling the cross member to accept the 3/4” difference but I didn’t want to do that.There is a difference, but either will work, just use the same bottom and top mounts.
Martin
No—no brackets for trans bracing.Did you have the brackets behind them for the transmission braces?
Martin
That may be. That would probably make up that difference.That was probably your issue. You have to use those if they came on the mounts from the factory.
Martin
Order some new ones, that way you’ll find the old ones.Trans is all sealed up. About to open up the transfer case and swap input shafts. I misplaced the alignment dowels for the back of this block.
Every damn timeOrder some new ones, that way you’ll find the old ones.


We were to wide allready. Nomarlly w/o the brace brackets is to narrowThat was probably your issue. You have to use those if they came on the mounts from the factory.
Martin
Are these the long tube ones? I have a 465 and keeping the drivetrain in the stock location for my 5.3 and looking for headers that fit.Diy 4X shock towers have enough clearance to get the headers in however I will have to shave them down a bit. This also depends on where you put them. I got luck lolView attachment 497911
Yes they are the 1 3/4” meant for C series pickup. Not sure if they will clear mechanical linkage.Are these the long tube ones? I have a 465 and keeping the drivetrain in the stock location for my 5.3 and looking for headers that fit.