C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

Engine Mounts

Thread Tools
 
Search this Thread
 
Old Sep 27, 2022 | 08:41 PM
  #1  
rremesal's Avatar
rremesal
Thread Starter
Burning Brakes
Veteran: Air Force
All Eyes On Me
Photogenic
Photoriffic
 
Joined: Jun 2022
Posts: 845
Likes: 212
From: Florida
Default Engine Mounts

Team,

I'd like to replace the engine mounts on my car and the transmission mount soon after.

Is there a write up somewhere on how to do this? What's the difficulty level?

Thanks96 CE
Reply
Old Sep 27, 2022 | 11:01 PM
  #2  
THE 383 admiral's Avatar
THE 383 admiral
Melting Slicks
15 Year Member
Liked
Loved
Community Favorite
 
Joined: Sep 2010
Posts: 2,422
Likes: 202
Default

I searched for you. I can only find vids for L98s fairly close to guide.
I should have documented my LT/s. Removal/ installs.
The LT motor mounts are much easier vs traditional clam shell style. And. less clearance is needed.
It's fairly tedious.

Last edited by THE 383 admiral; Oct 17, 2022 at 01:47 PM.
Reply
Old Sep 28, 2022 | 06:22 AM
  #3  
rremesal's Avatar
rremesal
Thread Starter
Burning Brakes
Veteran: Air Force
All Eyes On Me
Photogenic
Photoriffic
 
Joined: Jun 2022
Posts: 845
Likes: 212
From: Florida
Default

Thanks. You found exactly what I found.

I can handle the job, I'm sure. It just sucks being on my back under a car supported by Jack stands.
Reply
Old Sep 28, 2022 | 09:12 AM
  #4  
MatthewMiller's Avatar
MatthewMiller
Le Mans Master
Liked
Loved
Community Favorite
Top Answer: 1
 
Joined: Aug 2015
Posts: 6,111
Likes: 1,993
From: St. Charles MO
Default

There is no transmission mount in the sense of an engine mount. The C-beam is the transmission mount, but it's a metal-to-metal interface with the transmission tailshaft: nothing to replace.
Reply
Old Sep 28, 2022 | 09:13 AM
  #5  
rremesal's Avatar
rremesal
Thread Starter
Burning Brakes
Veteran: Air Force
All Eyes On Me
Photogenic
Photoriffic
 
Joined: Jun 2022
Posts: 845
Likes: 212
From: Florida
Default

No wonder I couldn't find a replacement part.
thanks a lot for the info.
Reply
Old Oct 16, 2022 | 03:45 PM
  #6  
rremesal's Avatar
rremesal
Thread Starter
Burning Brakes
Veteran: Air Force
All Eyes On Me
Photogenic
Photoriffic
 
Joined: Jun 2022
Posts: 845
Likes: 212
From: Florida
Default

Team,

How critical are the protective blankets on the engine mounts? I know they mounts sit close to the manifold, but are the shields absolutely necessary?

Thanks

Last edited by rremesal; Oct 16, 2022 at 07:39 PM.
Reply
Old Oct 17, 2022 | 04:53 AM
  #7  
rremesal's Avatar
rremesal
Thread Starter
Burning Brakes
Veteran: Air Force
All Eyes On Me
Photogenic
Photoriffic
 
Joined: Jun 2022
Posts: 845
Likes: 212
From: Florida
Default

Anyone?
Reply
Old Oct 17, 2022 | 05:17 AM
  #8  
grandspt's Avatar
grandspt
Drifting
20 Year Member
Liked
Loved
Community Favorite
 
Joined: Jul 2004
Posts: 1,354
Likes: 291
From: MA
Default

Originally Posted by rremesal
Anyone?
Without the blankets it will deteriorate the motor mounts quicker. How much is anyone's guess.
Now if you go to a polyurethane type bushing with no rubber then most manufacturers say that you can eliminate the blankets.
Reply
Corvette Stories

The Best of Corvette for Corvette Enthusiasts

story-0

10 Ugly Corvettes That We Still Kinda Love

 Joe Kucinski
story-1

Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer

 Brett Foote
story-2

10 Things Every Corvette Owner Needs (2026 Edition)

 Michael S. Palmer
story-3

8 Most "Only Corvette Owners Understand" Quirks and Problems

 Pouria Savadkouei
story-4

10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years

 Joe Kucinski
story-5

How Much Horsepower Every Corvette Engine "LOST" in 1972

 Joe Kucinski
story-6

Top 10 DOs and DON'Ts for Protecting Your Convertible Top!

 Michael S. Palmer
story-7

Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!

 Joe Kucinski
story-8

150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter

 Joe Kucinski
story-9

8 Coolest Corvette Pace Cars (and Replicas) of All Time

 Verdad Gallardo
Old Oct 17, 2022 | 05:25 AM
  #9  
rremesal's Avatar
rremesal
Thread Starter
Burning Brakes
Veteran: Air Force
All Eyes On Me
Photogenic
Photoriffic
 
Joined: Jun 2022
Posts: 845
Likes: 212
From: Florida
Default

Thanks for the feedback.

They sure are a pain to squeeze in with the mount.
Reply
Old Oct 17, 2022 | 07:17 AM
  #10  
dizwiz24's Avatar
dizwiz24
Race Director
20 Year Member
Liked
Loved
Community Favorite
 
Joined: Sep 2001
Posts: 14,678
Likes: 751
From: NEwhere Ohio
Default

Originally Posted by grandspt
Without the blankets it will deteriorate the motor mounts quicker. How much is anyone's guess.
Now if you go to a polyurethane type bushing with no rubber then most manufacturers say that you can eliminate the blankets.
i did solid mounts that user Churchkey made for the forum a few yrs back

so no worries about anything deteriorating
Reply
Old Oct 17, 2022 | 08:21 AM
  #11  
rremesal's Avatar
rremesal
Thread Starter
Burning Brakes
Veteran: Air Force
All Eyes On Me
Photogenic
Photoriffic
 
Joined: Jun 2022
Posts: 845
Likes: 212
From: Florida
Default

I don't think I'm ready for that level of hardcore-ness. In fact, in replacing the mounts hoping to eliminate some vibrations as the engine revs up.
the passenger side mount looked in great shape though. Not sure this is it, unless the driver side is totally shot.
Reply
Old Oct 17, 2022 | 08:39 AM
  #12  
MatthewMiller's Avatar
MatthewMiller
Le Mans Master
Liked
Loved
Community Favorite
Top Answer: 1
 
Joined: Aug 2015
Posts: 6,111
Likes: 1,993
From: St. Charles MO
Default

Originally Posted by rremesal
I don't think I'm ready for that level of hardcore-ness. In fact, in replacing the mounts hoping to eliminate some vibrations as the engine revs up.
the passenger side mount looked in great shape though. Not sure this is it, unless the driver side is totally shot.
If it's a vibration that peaks around 3000rpm, you may need to check your flywheel or flex plate to see if it has the proper balance for your engine.
Reply
Old Oct 17, 2022 | 11:32 AM
  #13  
rremesal's Avatar
rremesal
Thread Starter
Burning Brakes
Veteran: Air Force
All Eyes On Me
Photogenic
Photoriffic
 
Joined: Jun 2022
Posts: 845
Likes: 212
From: Florida
Default

I have a ZF, and that whole clutch assembly needs attention. The clutch chatters like crazy. The vibrations are felt as RPM increases, under load or not.
Reply
Old Oct 17, 2022 | 03:00 PM
  #14  
MatthewMiller's Avatar
MatthewMiller
Le Mans Master
Liked
Loved
Community Favorite
Top Answer: 1
 
Joined: Aug 2015
Posts: 6,111
Likes: 1,993
From: St. Charles MO
Default

Originally Posted by rremesal
I have a ZF, and that whole clutch assembly needs attention. The clutch chatters like crazy. The vibrations are felt as RPM increases, under load or not.
Clutch chatter, "rollover" gear rattle, and RPM-dependent vibration are three different things. You have the latter of those three things. I'm willing to be you have a flywheel that has the wrong balance. Your engine probably still requires an external balance on the flywheel and someone put a neutral-balanced one on there. It's possible that it could be the other way around, though, if your engine was ever rebuilt and someone spent the time and effort to make it internally balanced.
Reply
Old Oct 17, 2022 | 03:09 PM
  #15  
rremesal's Avatar
rremesal
Thread Starter
Burning Brakes
Veteran: Air Force
All Eyes On Me
Photogenic
Photoriffic
 
Joined: Jun 2022
Posts: 845
Likes: 212
From: Florida
Default

Trust me, I have terrible clutch chatter....especially in reverse going up the driveway into the garage. TERRIBLE!

I don't doubt though what you are saying about the flywheel.
Reply
Old Oct 17, 2022 | 06:17 PM
  #16  
ChumpVette's Avatar
ChumpVette
Safety Car
15 Year Member
Liked
Loved
Community Favorite
 
Joined: Jun 2010
Posts: 4,564
Likes: 1,676
Default

Originally Posted by rremesal
Team,

How critical are the protective blankets on the engine mounts? I know they mounts sit close to the manifold, but are the shields absolutely necessary?

Thanks

Reach out to these guys. They made some shields with their insulation.

https://www.koolmat.com
Reply
Old Oct 17, 2022 | 08:42 PM
  #17  
rremesal's Avatar
rremesal
Thread Starter
Burning Brakes
Veteran: Air Force
All Eyes On Me
Photogenic
Photoriffic
 
Joined: Jun 2022
Posts: 845
Likes: 212
From: Florida
Default

All,

I had a hell of a time trying to get the driver side mount in. I struggled for about 2 hours. I finally realized I had the mount facing the wrong way (180*).
Noticed in the picture below how the top of the mount where the bolt goes through, there is a groove that mates with a notch on the engine mount bracket. If you have it backwards, the mount will never slide in to place.

The passenger side took me about a minute yesterday. However, notice how the passenger side sits a bit offset on the base. Is this what you all have seen as well?


Notice the groove where the bolt goes through.

Passenger side

Driver side... It sits more centered than passenger side. 😐
Reply

Get notified of new replies

To Engine Mounts





All times are GMT -4. The time now is 12:43 PM.

story-0
10 Ugly Corvettes That We Still Kinda Love

Slideshow: 10 ugly Corvettes that we still kinda love.

By Joe Kucinski | 2026-06-03 10:34:17


VIEW MORE
story-1
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer

A lot of money has changed hands at the online auction house over the years.

By Brett Foote | 2026-06-03 10:21:50


VIEW MORE
story-2
10 Things Every Corvette Owner Needs (2026 Edition)

Slideshow: 10 great gifts Corvette enthusiasts actually want for Father's Day!

By Michael S. Palmer | 2026-06-03 15:43:40


VIEW MORE
story-3
8 Most "Only Corvette Owners Understand" Quirks and Problems

Slideshow: These are the quirks, annoyances, and oddly lovable problems that every Corvette owner eventually learns to live with.

By Pouria Savadkouei | 2026-05-28 09:31:39


VIEW MORE
story-4
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years

Slideshow: 10 reasons why the C6 Z06 is still a performance benchmark after 20 years.

By Joe Kucinski | 2026-05-27 17:20:09


VIEW MORE
story-5
How Much Horsepower Every Corvette Engine "LOST" in 1972

Slideshow: How much horsepower every Corvette engine lost in 1972.

By Joe Kucinski | 2026-05-27 16:54:53


VIEW MORE
story-6
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!

Slideshow: How to Protect A Convertible Top: 10 DOs & DON'Ts

By Michael S. Palmer | 2026-04-03 00:00:00


VIEW MORE
story-7
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!

Slideshow: The 10 most explosive Corvettes ever built based on power-to-weight ratio.

By Joe Kucinski | 2026-05-20 07:23:03


VIEW MORE
story-8
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter

Slideshow: From C1 to C8 we compare every Corvette generation by the numbers.

By Joe Kucinski | 2026-05-12 16:54:12


VIEW MORE
story-9
8 Coolest Corvette Pace Cars (and Replicas) of All Time

Slideshow: Some Corvette pace cars became collectible legends, while others perfectly captured the look and attitude of their era.

By Verdad Gallardo | 2026-05-11 09:50:51


VIEW MORE