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I used solid Moroso mounts for my BBC in my 78 C3. The cabin is isolated from the frame by rubber bushings, so even with solid mounts, engine noise and vibration isn't transmitted to the interior. I do use a poly transmission mount, though, to allow for some flex between the powertrain and the frame.
I also used Moroso solid mounts for my IROC (3rd gen Camaro), which has that unit-body construction, and all the engine noises and vibration are heard and felt inside the cabin. A totally different experience.
I would suggest the correct later C3 mounts that have the safety lock.
Correct but no lock early c3 mounts be danged.
I do not want an air cleaner stud dent in my fiberglass hood. Or a torn up fan shroud.
Seen that too many times.
From a corvette vendor like corvette central.
The common parts store ones (anchor?) the metal is about 1/2 as thick.
Not poly, they melt, too much heat there.
Early C3 have solid body mounts, til 72.
No solid motor mounts on those, you risk NVH vibrations.
You might get lucky, you might not.
73+ cars had thick rubber body mounts, different animal.
Last edited by leigh1322; Feb 22, 2026 at 12:30 PM.
I would suggest the correct later C3 mounts that have the safety lock.
Correct but no lock early c3 mounts be damaged.
I do not want an air cleaner stud dent in my fiberglass hood. Or a torn up fan shroud.
Seen that too many times.
I don't recall the exact year but my Dad's late 60's or maybe early 70's Impala with a 327 with cruise control had a broken driver side mount and if you stepped into it and what teenager would not the motor lifted and pulled on the accelerator cable to wot. It was a very interesting experience in a subdivision street. I had to turn the key off to stop. I figured out what the issue was and my Dad and I went to the dealer who was telling my Dad a line of BS so he got loud in the showroom and they decided to fix it.
I recommend Anchor P/N 2285 available from RockAuto. They're inexpensive, interlocking and a good fit. Personally I would never use a solid mount because that makes the engine and transmission a structural member of the frame. Just my humble opinion.
I recommend Anchor P/N 2285 available from RockAuto. They're inexpensive, interlocking and a good fit. Personally I would never use a solid mount because that makes the engine and transmission a structural member of the frame. Just my humble opinion.
i followed the lead of someone else in the forum. Solid Moroso on hte left, energy suspension on the right & trans. No lift on the left to create clearance issues with the hood. 535HP. Did not want to risk lift.
uhh, it's a performance street car (not a race car), right ?
The driver side mount is THE ONE that typically fails. Motor twists-lifts up on DS and mount Separates. While Passenger side Compresses.
Have done the ES Poly mount thing; Not Again. Poly cannot sustain exhaust heat nearly so well as does plain, OE replacement-type Rubber.
Chances are, OE replacement-type rubber mounts at both sides (and at trans tailshaft) will serve long & well.
OR, just One Solid mount at Only Driver side.
If you're looking to brace those front shock towers, then do so across top of shock towers (and plan pulleys, belts, fan accordingly).
GM Power Book is a great source of details referencing welding/bracing chassis for performance.
link to PDF power book's C2-C3 section https://www.corvetteforum.com/forums...276d1629252120
Last edited by Rebelyell; Feb 17, 2026 at 03:30 PM.
As a long time C3 owner I can tell you that I got tired of replacing those stock type rubber mounts. I run Morroso solids now and rubber on the transmission tailshaft. No more broken mounts.
I was able to find a used single Moroso solid mount for the drivers side cheap on Ebay. It's going in next time the car is up on the ramps. Car has plenty of torque now and no room under the hood if the mount fails. Just need to be safe.
From a corvette vendor like corvette central.
The common parts store ones (anchor?) the metal is about 1/2 as thick.
Early C3 have solid mounts, til 72.
73+ cars had thick rubber mounts, different animal.
No C2 or C3 Corvette used solid engine mounts, all had rubber cushions. (Maybe I'm misunderstanding.) The C2 and first couple years of C3 used a non-locking rubber mount and then GM moved to the locking style rubber mount. The locking mount came to the production line in 1970. All are backwards compatible with the locking upgrade replacement.
Originally Posted by jthornton
For a low power cruiser what mount is the best?
If you want a stock GM style locking mount that fits, go with the Corvette Central mounts. They are much better than the Anchor or other standard replacement brands. I have 2 pairs of Anchor variations on my parts shelf because the frame horn portion of the mounts were way too sloppy and wide. I happened to still have the original 1972 GM mounts and the Corvette Central mounts have the same fit on the frame and appear identical to the originals.
The change in body mounts in 72/73, from solid to rubber, would definately have an effect on your comfort with solid motor mounts.
Solid in both locations would leave nothing to dampen the NVH vibrations.
And yes the metal in the Anchor mounts is much thinner and weaker than the correct Corvette Central ones.
I'm at the same power level. Curious to know how long you have been using them and if the car has been driven hard often. In the hunt for the correct setup for my 530hp small block backed by tremec TKX and Dougs Headers side pipes. This topic is full of many different experiences creating loads of opinions (many conflicting).
**New to this forum. message was meant to be a response to "lickahotskillet"
Last edited by C3TKX; Apr 4, 2026 at 03:27 PM.
Reason: posted incorrect spot
I'm at the same power level. Curious to know how long you have been using them and if the car has been driven hard often. In the hunt for the correct setup for my 530hp small block backed by tremec TKX and Dougs Headers side pipes. This topic is full of many different experiences creating loads of opinions (many conflicting).
**New to this forum. message was meant to be a response to "lickahotskillet"
Welcome to the forum. You can press the quote button like I did and get a quote of the person you're replying to.
The change in body mounts in 72/73, from solid to rubber, would definately have an effect on your comfort with solid motor mounts.
Solid in both locations would leave nothing to dampen the NVH vibrations.
And yes the metal in the Anchor mounts is much thinner and weaker than the correct Corvette Central ones.
didn't know that they changed in 73. Yup that would make a big difference if you went with solid mounts. It would be fine, though, if you enjoy listening to engine sounds. My Vette's don't have radios, for that reason.
I've been running the solid motor mounts/rubber trans mount for a while now. I don't notice any additional vibration or noise. I truly like the fact that it makes the engine block a structural part of the frame. Anything at all that can help stiffen the frame and reduce flex and twists is a good thing in my mind.
It seemed like even with my mild 350 everytime I launched the car hard, there went the drivers side motor mount.
I got tired of changing them. I tried different brands of the rubber mounts. Always the safety locking design. But always ripped apart.
The morroso steel units may not be factory. But my engine stays put!
Engine Mounts
