I need help, I am putting a 400 cu.in. Chevy small block in my 1983 Olds, Delta 88. I know that i have to replace the olds mounts with the chevy ones, and my questions is where do they go. In the place where the olds where or do they have to go in an other postion? Any one know or has done this swap before, thanks for your help.
Motor mounts for small block chevy in Olds
- Thread starter caliente delta 88
- Start date
- Status
The mounts appearing in the attached picture look to be in the correct position for a small block Chev mill. After that, they appear to be a solid mount which makes me wonder what the matching halves look like? Pre 78, from the factory, the rubber half of the motor mount was attached to the motor and the solid pedestal they sat on was bolted to the frame. Those mounts were notorious for tearing up their rubber cushions and the later versions came with ears that acted as limiters on how much the motor could twist under full throttle. FYI, what the factory initially suggested was a piece of wire rope with eyes woven into it that got bolted to the motor and the frame!! Saw cars with lengths of chain that did the same thing. The factory replaced all that with what most late 70-80 B/G bodies came with; the solid mount attached to the motor and the rubber cushion sandwiched between two metal pockets which are plug welded together.
What I am seeing makes me wonder if you are running totally solid mounts on your old motor or some type of aftermarket unit?
To be absolutely sure you would have to score one of the OEM frame half late model version engine mounts and compare/measure it against the solid one on your frame to see if they match. If the bolt pattern measures/comparison proves them to be the same, then you should have no trouble using the Chev mounts on your corporate frame. The only caveat in all this is that those solid motor mount clams or shells that get attached to the motor are not universal with respect to application. I have found from experience that the distance from the mounting holes on the shell to the center line of the through bolt can vary because the crossmembers themselves vary from B to G to C to K through the various models.
Nick
What I am seeing makes me wonder if you are running totally solid mounts on your old motor or some type of aftermarket unit?
To be absolutely sure you would have to score one of the OEM frame half late model version engine mounts and compare/measure it against the solid one on your frame to see if they match. If the bolt pattern measures/comparison proves them to be the same, then you should have no trouble using the Chev mounts on your corporate frame. The only caveat in all this is that those solid motor mount clams or shells that get attached to the motor are not universal with respect to application. I have found from experience that the distance from the mounting holes on the shell to the center line of the through bolt can vary because the crossmembers themselves vary from B to G to C to K through the various models.
Nick
Not sure exactly what holes in the frame you will need to use on a B body, but I think you can use the following part numbers from the Olds Parts catalog, that call out the 267/305 SBC (Vin Code J/H), it was export to Canada afaik)
Frame Mounts: 459021
Readily available from many places, for example: https://www.rockauto.com/en/partsearch/?partnum=459021
Engine Brackets: 334970
These you may have to dig around to locate aftermarket or buy used on ebay, etc.?
Here is a pic of 334970, I actually have these in my G Body with SBC note the cage nut that makes tightening the long through bolt much easier without the need to hold with a wrench on the nut side. I bought them when they were still available from GM parts many years ago.
Hope this helps!
The through bolt is part number 334972 (7/16-14 x 5 1/8" L), flange nut is part number 6262212.
Here's the SBC frame mounts location on my 1987 G Body crossmember in case it helps.
Frame Mounts: 459021
Readily available from many places, for example: https://www.rockauto.com/en/partsearch/?partnum=459021
Engine Brackets: 334970
These you may have to dig around to locate aftermarket or buy used on ebay, etc.?
Here is a pic of 334970, I actually have these in my G Body with SBC note the cage nut that makes tightening the long through bolt much easier without the need to hold with a wrench on the nut side. I bought them when they were still available from GM parts many years ago.
Hope this helps!
The through bolt is part number 334972 (7/16-14 x 5 1/8" L), flange nut is part number 6262212.
Here's the SBC frame mounts location on my 1987 G Body crossmember in case it helps.
I've always put the both mounts and frame mounts on the engine and set engine in and mark where they fit or put a bolt threw them if the holes line up I know it's a lot of work in and out with the engine but you can see how it fits the best and make adjustments.
I want to thank everybody who replyed to my question. And 383 Stealth Ram, thank you for the pictures, you know what they say about a picture is worth a thousand words. Have a great day.
When you go to do your mount swap, beware that from the factory those frame bolts were metric. The holes in the crossmember itself are drilled wide enough that you can sub in a 7/16ths cap screw instead. From the factory they go in from the engine bay and you have to fish around inside the crossmember to get the nuts and locks to line up and run up onto the threads. For myself, elected to put the bolts in from below/inside and that gave me easier access to them to thread the nuts on.
- Status
Similar threads
