Rubber engine mounts
Thread Starter
Junior Member
Joined: Jul 2014
Posts: 66
Likes: 2
From: Massachusetts
Car: 1983 Z28 T-tops
Engine: 350 GM Crate
Rubber engine mounts
Who sells the best stock rubber engine mounts? I can't seem to find the GM part # and reviews for these.
I don't want poly.
thanks all
I don't want poly.
thanks all
Re: Rubber engine mounts
GM hasn't sold a small block in years, doubt they manufactured the mount inserts themselves in over a decade. You might find AC Delco on Rock Auto, but chances are better than average you'll get some discount brand in an AC Delco box.
I get that some people hate poly because it squeeks or it's harsh... I'm fairly picky and my personal experience was that ES poly mounts weren't at all objectionable.
I get that some people hate poly because it squeeks or it's harsh... I'm fairly picky and my personal experience was that ES poly mounts weren't at all objectionable.
Senior Member




Joined: Jan 2019
Posts: 576
Likes: 507
Car: 1989 Firebird GTA
Engine: Motown Aluminum 427
Transmission: TH400/GVO
Axle/Gears: Dana 44 IRS 3.75:1
Re: Rubber engine mounts
Use poly, they come in black, you can't tell the difference except they they don't break, and they don't flex....
Joined: Mar 2017
Posts: 4,255
Likes: 427
From: Portland, OR
Car: 86 Imponte Ruiner 450GT, 91 Formula
Engine: 350 Vortec, FIRST TPI, 325 RWHP
Transmission: 700R4 3000 stall.
Axle/Gears: 9 Bolt Torsen 3.70
Re: Rubber engine mounts
I switched to poly mounts recently (Energy) and you can't even tell the difference vs the stock rubber IMO. They are NOT harsh at all. I can't tell any increase in NVH.
And yeah - I doubt there is anyone out there making *quality* rubber mounts. There's no market for them and proper vulcanized rubber is CRAZY expensive to manufacture compared to poly.
GD
And yeah - I doubt there is anyone out there making *quality* rubber mounts. There's no market for them and proper vulcanized rubber is CRAZY expensive to manufacture compared to poly.
GD
Thread Starter
Junior Member
Joined: Jul 2014
Posts: 66
Likes: 2
From: Massachusetts
Car: 1983 Z28 T-tops
Engine: 350 GM Crate
Re: Rubber engine mounts
Thanks. I have Dyno Don headers and y pipe coming in 2 weeks. They suggested stock rubber to prevent the pipe from rubbing. They said poly makes it sit too high and pulls pipe up with it.
Joined: Mar 2017
Posts: 4,255
Likes: 427
From: Portland, OR
Car: 86 Imponte Ruiner 450GT, 91 Formula
Engine: 350 Vortec, FIRST TPI, 325 RWHP
Transmission: 700R4 3000 stall.
Axle/Gears: 9 Bolt Torsen 3.70
Re: Rubber engine mounts
I have Dyno Don headers and y-pipe. They were installed with worn out rubber mounts that I have since replaced with poly and I didn't have any problems before or after. The poly mounts did pull the engine forward about 1/4" and I had to adjust the y-pipe to not hit the engine cradle. Wasn't a problem though. My headers don't hit anything.
GD
GD
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