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G3GM 1973 to 1977 A-bodys. Chevelles, Monte Carlos, El Caminos, Laguna, 442, Cutlass, Malibu, GTO, LeMans, Century, Regal, Grand Am, Grand Prix, Sprint, Gran Sport, Can Am, Hurst-olds, and other 73-77 A-bodies


BBC motor mounts?

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G3GM :: G3 Tech :: Part interchangeability

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BBC motor mounts? Empty BBC motor mounts?

Post by 74chick Fri Jul 16, 2010 2:09 pm

Are '70 to '72 upper mounts "clam shells" to same as '73 to '77?
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Post by The Dude Fri Jul 16, 2010 2:32 pm

Not that I'm aware of. I know the small blocks aren't.
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Post by BlackChevelleSS Fri Jul 16, 2010 9:33 pm

70 to 72 used a completely different style mount. The frame has the steel perches while the rubber isolators mounted to the block. Its a very inferior design compared to the 73 and later models which uses a housed rubber isolator attached to the frame and the all steel "clam shells" mounted to the engine. The only thing I dont like about the 73 and later models is that if you have to change them its a PITA, but how often would you have to change them? once every 30 years? Ive already been through 5 sets of mounts on my 70 which break if you have over 200ft lbs of torque.

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Post by The Dude Fri Jul 16, 2010 11:02 pm

LMAO, everything seems to be inferior on the earlier models other than power supply.
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Post by JB2wheeler Sat Jul 17, 2010 11:59 am

Rago wrote:LMAO, everything seems to be inferior on the earlier models other than power supply.
What you mean is STOCK power supply. Even if you have an older model the first thing you do is alter the engine for the better and the 73/77 models have the same BASIC engine and can be altered just as easily as the older ones. JB
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Post by 74chick Sat Jul 17, 2010 1:20 pm

Ok, I know small block and big shells are diffrent but, is truck and car differnt? It's some thing to do with the placement of the hole for the lower mount.
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Post by novaderrik Sat Oct 23, 2010 2:00 pm

up to 72, they used a mount system with the rubber isolator bolted to the block with the frame stand being solid. there are different mounts for small blocks and big blocks and they were prone to tearing the driver's side mount apart until they came out with an interlocking mount design in '70 or so. there are 2 styles of engine side mounts- tall and narrow and short and wide- and several different styles of frame mounts depending on engine size and what chassis they were being put in- for example, in '70 Chevelles the 307 used a different mount setup than the 350, with the big blocks using yet another design. why they did this is anyone's guess..
73 and up use a "clamshell" mount system with the rubber isolator mounted to the frame and surrounded by a solid steel shell so it's all but impossible for the mount to fail catastrophically like the old design. this exact same mount setup (with a few small variations) was used in pretty much every GM car and truck with a Chevy small block or big block V8 except for Vettes and the V8 Monza until they stopped putting the big 8100 engine in 3/4 ton and bigger trucks a few years ago.

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