C3 Engine mounts
Thread Starter
Racer
Joined: Mar 2012
Posts: 262
Likes: 1
From: New South Wales
C3 Engine mounts
Hi,
I am well into my C3 rebuild and thought that I would replace the original engine mounts while I was going as the old ones look a little shabby and possibly cracked.
Question is, is it preferable to replace them with the original style locking (correct) mounts or replace them with the polyurethane mounts? Not much difference in price, but I wondered if the poly mounts are too rigid. The new engine is a 340HP 383 Stroker.
Thanks, Colin
I am well into my C3 rebuild and thought that I would replace the original engine mounts while I was going as the old ones look a little shabby and possibly cracked.
Question is, is it preferable to replace them with the original style locking (correct) mounts or replace them with the polyurethane mounts? Not much difference in price, but I wondered if the poly mounts are too rigid. The new engine is a 340HP 383 Stroker.
Thanks, Colin
Pro
Joined: Nov 2012
Posts: 672
Likes: 0
From: Chesapeake Virginia
depends on what your primary use of the car is, if it's a street cruiser that rarely sees HARD accelerations, then go with the rubber mounts, they transfer less vibration to the frame/body.
if your going to be racing or doing alot of hard pulls, then get the urethane and sacrifice some comfort in lieu of performance.
if your going to be racing or doing alot of hard pulls, then get the urethane and sacrifice some comfort in lieu of performance.
Terrorizing Orange Cones
Joined: Oct 2007
Posts: 2,572
Likes: 17
From: Northern CO
Burning Brakes
Joined: Dec 2010
Posts: 945
Likes: 10
From: Winston Salem NC
Stock rubber should be good for 25-30 years.
I had a bad one when I bought my '76. When I put my foot into it I could hear this strange grinding sound. Turned out to be the engine lifting and putting the fan into the fan shroud. I was able to see wear on the shroud and shiny metal on the fan blades.
I had a bad one when I bought my '76. When I put my foot into it I could hear this strange grinding sound. Turned out to be the engine lifting and putting the fan into the fan shroud. I was able to see wear on the shroud and shiny metal on the fan blades.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Every 2027 Corvette Engine Explained
Joe Kucinski
Designer Imagines A Corvette That Looks More Like a Corvette Than the Corvette
Verdad Gallardo
10 Ugly Corvettes That We Still Kinda Love
Joe Kucinski
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Drifting
Joined: Mar 2011
Posts: 1,886
Likes: 9
Get the locking type mounts, poly or otherwise. If the mount tears and the engine moves up under hard acceleration, your fan will go into the shroud and the upper radiator neck will be torn off the radiator.
Signed,
Learned the Hard way
Signed,
Learned the Hard way
Pro
Joined: Oct 2009
Posts: 523
Likes: 4
From: Calgary Alberta
Hi,
I am well into my C3 rebuild and thought that I would replace the original engine mounts while I was going as the old ones look a little shabby and possibly cracked.
Question is, is it preferable to replace them with the original style locking (correct) mounts or replace them with the polyurethane mounts? Not much difference in price, but I wondered if the poly mounts are too rigid. The new engine is a 340HP 383 Stroker.
Thanks, Colin
I am well into my C3 rebuild and thought that I would replace the original engine mounts while I was going as the old ones look a little shabby and possibly cracked.
Question is, is it preferable to replace them with the original style locking (correct) mounts or replace them with the polyurethane mounts? Not much difference in price, but I wondered if the poly mounts are too rigid. The new engine is a 340HP 383 Stroker.
Thanks, Colin
The rubber mounts will crack over time, the poly mounts may possibly melt if you have a high heat engine, and the solid mounts transmit engine vibration to the frame.
Each has it's possible weakness. I went with poly on my engine, but will need to see if I experience a melting problem or not.
If they melt then I will change over to the solid mounts, I would rather not install rubber mounts as my engine is highly modified and the stock rubber mounts won't perform as needed.
JMHO.
Le Mans Master
Joined: Apr 2011
Posts: 6,284
Likes: 1,171
From: Hermosa
and the solid mounts transmit engine vibration to the frame.
Last edited by REELAV8R; Aug 27, 2013 at 03:04 PM.
Pro
Joined: Nov 2012
Posts: 585
Likes: 39
From: FL
Like I mentioned above I don't have any vibration issues with the poly mounts. However, I wished now that I had installed the locking mounts like gcusmano74 mentions. My poly mounts look nice and clean but the rubber mounts I replaced were locking. The driver's side rubber mount was torn in two pieces and the locking feature did prevent addition damage.