Macadoo

I'm getting ready to swap in the 455 I just built (fingers double crossed that it runs) so I pulled the small block yesterday. And even though I replaced the motor mounts four years ago, the driver's side mount was broken; sheered the rubber in half.
Is this common? Did I get a defective mount? Anyone have a recommendation for new mounts? I'm going to use the 350 pads so will want 350 mounts.

oldcutlass

Did you beat the small block like a rented mule before pulling it?

Macadoo

Well......yeah.....
But no animals were harmed in the making of this broken motor mount.

dragline

You can use a single or both solid motor mounts, I bought a pair a long time ago, surprisingly I had less engine vibration with the solids. Chrysler chassis manual recommends a least 1 rubber mount out of the 3 mounts (2 engine,1 trans) to take up vibration and prevent cracks.
https://store.dickmillerracing.com/e...ountsteel.aspx

Macadoo

Thanks dragline, I hadn't thought about using one solid mount. I'll have a look around. I want to use my small block pads so will need small black mounts.

oldcutlass

Solid mount on the drivers side will probably work great for you Mac.

Macadoo

Well since I'm hoping this 455 (461) has a wee bit more power than that tired 350, I'd better do something. The ad says "race engines only". Will it be okay on the interstate? You folks know how the wife likes to travel

oldcutlass

Lol, that's why it was suggested to just do the drivers side only. It wont be as harsh because you have a rubber mount on the other side.

Greg Rogers

That's a interesting idea. I have experience with today's cheap motor mounts myself.(junk) I never broke one but they have sagged causing the fan to hit shroud on both Olds'. I finally put polyurethane motor mounts in my 65 Dodge and it about rattled my fillings out. That car had a lumpy big block but I knew then that I would never want polyurethanes in my Olds.

oldcutlass

To the best of my knowledge there are still no aftermarket poly mounts for an Oldsmobile.

Macadoo

Good info! I've been looking for poly but couldn't find any. And now, thanks to Greg, I know I don't want them anyway.
Copper suggested lag screws through the rubber on stock mounts for a semi-solid mount. Anyone ever try that? It's the hex-head that would worry me; they're pretty thick and would take up needed bouncy space in the mount.