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Hi all - having my small block rebuilt out of my 1970. While the motor is out, I'm looking at various things. I'm sorry for what is probably a dumb question...but how do I know if I should replace the motor mounts? Here are a couple pictures of one of mine...obviously if they need it, now is the time to do it! If you think they need replacement, any recommendations? Thanks all!! Hope you are staying healthy!
I've broken a couple of left ones. Those look fairly old. For what they cost. Just replace them. As per type, I just run the stock style ones like you have there. Available from all the Corvette vendors and most auto parts stores.
No hard to replace with the motor in the car, but a no-brainer with the engine out. Get some good OEM or Energy Suspension mounts. If you have headers the the poly in the ES may be an issue, in that case use Moroso solids.
No hard to replace with the motor in the car, but a no-brainer with the engine out. Get some good OEM or Energy Suspension mounts. If you have headers the the poly in the ES may be an issue, in that case use Moroso solids.
I had ES red poly mounts in our 75, they broke after some runs at the track and about 1000 miles. We went to solid mounts and never looked back. On my street car they have been ok. If I was to replace a set now I would go back to rubber factory type.
I'll state this but invite others to chime in if it is incorrect. I was told that if you decide to use solid mounts on the engine you need to use a solid mount on the transmission also.
That said, my original rubber mounts on my '80 have gone 40 years and 90k. I'll replace them next year when I swap out the engine. Given their longevity, I'll just replace them with rubber.
I'll state this but invite others to chime in if it is incorrect. I was told that if you decide to use solid mounts on the engine you need to use a solid mount on the transmission also.
You can run solid mounts without a solid trans mount.. a poly trans mount may be good with solid motor mounts.
I'd change them while you have access. And tidy up any other components that may be hard to get to otherwise. Like A/C components. If you're in Minnesota, your heater core lol
How do you know if you should replace the mounts? Easy question. If they are old and GM its a no-brainer.
Some of the older folks will remember one of the largest recalls in automotive history. Chevy V8 rubber engine mounts. Thousands of them separated. In some cases the throttle was held open. Not good times.
Buy Moroso Solid mounts and use a drop of LockTite Blue on ARP bolts. Its the right choice and the right thing to do. (sounds like a commercial)
And never use solid tranny mounts, Something has to give a little with the torque. So let it be the trans rubber instead of a cracked tailshaft housing.
Last edited by HeadsU.P.; May 15, 2020 at 04:59 PM.
I just recently installed new motor mounts from Corvette Central. After comparing them to the cheap motor mounts at the parts store, it seemed to be a no-brainer. The CC mounts were much beefier. Here's a link to a comparison: https://tech.corvettecentral.com/201...vette-central/
Get factory type rubber mounts from a local store. (If they don't look to be good quality, you can return them.)
Absolutely! Go local if at all possible.
I have gone through quite a frustrating exercise in getting decent engine mounts. I ordered a stock replacement pair through Rock Auto and what came in were two mismatched mounts in identical boxes. One mount was made in US, the other, I if I recall correctly, in China. They measured the same but one had a wonky welded washer, one had excessive rubber overcoating, one was glossy the other not, etc. Tried to return them but RA wanted to deduct money from the refund such that it wasn't worth the time or hassle. I'm sure they'd work but they weren't what I wanted as far as quality and consistent look compared to my originals.
I then found Anchor brand through a local dealer - when I went to pick them up, once again, one was glossy, one matte. The counter guy immediately said that if I could wait a couple days he'd order in a couple more and I could choose whatever pair I liked best. I suppose he's a car guy like myself -- even motor mounts should look good!
I have been restoring cars for 50 years now.
Had the 81 maybe 20?
NOS parts are expensive, and CHEAPER in the long run.
Sadly, repop Model T parts are 96% really made well.
When you see a car in a show that is new and clean, some things just dont matter.
Should I replace these motor mounts?
