Motor mount application list
#82
Actually, the frame-side mounts are bolted to the frame, not riveted.
This is why I suggested the Chevy clamshell mounts. These put the rubber on the frame side, and since the rubber does deteriorate, replacements are readily available. Anchor P/N 2387 are used on the 403 Trans Am as well as on a bazillion Chevy applications,
The 403 block-side brackets to mate with these are also pretty readily available. People who are pulling the 403s out of their Pontiacs sell them all the time on ebay, and reproductions are also available.

This is why I suggested the Chevy clamshell mounts. These put the rubber on the frame side, and since the rubber does deteriorate, replacements are readily available. Anchor P/N 2387 are used on the 403 Trans Am as well as on a bazillion Chevy applications,
The 403 block-side brackets to mate with these are also pretty readily available. People who are pulling the 403s out of their Pontiacs sell them all the time on ebay, and reproductions are also available.

this is a two piece correct? is the straight bar required to be used? or can just the piece that cross bolts to the frame mount be used?
Last edited by naphtali5725; March 4th, 2015 at 06:21 AM.
#83
Yes and yes. The straight bar bolts to the three motor mount bolt holes in the Olds block and has two studs that the U-shaped bracket bolts to. There's no other way to attache the U-bracket to the block.
#84
#86
Great thread! Thanks to Joe. I know this has been brought up before. But I can't find good quality mounts. My 71 Cutlass 350 had sagged so much the oil pan hit on the crossmember. My 70 Vista 350 had a small aftermarket flex fan on it when I bought it and when I attempted to put the original factory type clutch fan back on it, I found the mounts had sagged. I had to replace them to get the fan on. Now after 5 years or so I can tell the mounts in the Cutlass have started to sag again. Also the motor mounts on my 65 Coronet big block had sagged causing the headers to hit on the pitman arm. I finally replaced those with Schumacher polyurethane mounts and it raised the engine 3/4 inch. But I hate those! Car shakes like it has solid mounts! Anyone know of higher quality mount available?
#87
#88
Great thread! Thanks to Joe. I know this has been brought up before. But I can't find good quality mounts. My 71 Cutlass 350 had sagged so much the oil pan hit on the crossmember. My 70 Vista 350 had a small aftermarket flex fan on it when I bought it and when I attempted to put the original factory type clutch fan back on it, I found the mounts had sagged. I had to replace them to get the fan on. Now after 5 years or so I can tell the mounts in the Cutlass have started to sag again. Also the motor mounts on my 65 Coronet big block had sagged causing the headers to hit on the pitman arm. I finally replaced those with Schumacher polyurethane mounts and it raised the engine 3/4 inch. But I hate those! Car shakes like it has solid mounts! Anyone know of higher quality mount available?
#89
#90
#92
1964-1968 frame mounts (all) - use P/N 2261 motor mounts
1969-1972 SBO frame mounts - use P/N 2261 motor mounts
1969-1972 BBO frame mounts - use P/N 2328 motor mounts
1973-1988 frame mounts (all) - use P/N 2328 motor mounts
This is good info, my understanding is that PN 2261 is roughly 1-5/8 from mount engine mount hole to center of frame mount hole, PN 2328 is 2-1/2, you can also use PN 2286 which is a ford/mercury part number and it measures right under 2 inches. I actually ran that on my BBO for the last year. So it's in between the Olds mounts but still fits.
I'm getting ready to change to the taller mount so I have a spare set that I would be happy to send you Joe for verication just to put into the data bank of what fits and what will work I can see where this might be beneficial for some people doing engine swaps
1969-1972 SBO frame mounts - use P/N 2261 motor mounts
1969-1972 BBO frame mounts - use P/N 2328 motor mounts
1973-1988 frame mounts (all) - use P/N 2328 motor mounts
This is good info, my understanding is that PN 2261 is roughly 1-5/8 from mount engine mount hole to center of frame mount hole, PN 2328 is 2-1/2, you can also use PN 2286 which is a ford/mercury part number and it measures right under 2 inches. I actually ran that on my BBO for the last year. So it's in between the Olds mounts but still fits.
I'm getting ready to change to the taller mount so I have a spare set that I would be happy to send you Joe for verication just to put into the data bank of what fits and what will work I can see where this might be beneficial for some people doing engine swaps
Last edited by real57vetteguy; July 19th, 2015 at 10:06 PM.
#94
The block doesn't matter; all Olds blocks have the same motor mount bolt holes. Just get the motor mounts that match the frame mounts.
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