Clam shell motor mount question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Houston Ben · 04-13-2019, 12:12 PM

Hi all,
I have a 86 C10 5.3 and I think my rubber mounts are done as they are brittle and cracked all over. Just wondering if there is anything new out there besides the energy suspension and store bought rubber mounts. I have tried to search, but can't find what I am looking for exactly.

Some say the rubber won't last long, some like the poly and some don't.

Any advise?

Thanks.

**mongocanfly** · 04-13-2019, 01:14 PM

my rubber mounts have been working since 1981..with the 350 and the 6.0..no issues
ive been seeing people with poly mounts are having issues with vibrations though

sweetk30 · 04-13-2019, 01:41 PM

i cant say 100% if they bolt in and work correct on the 2wd stuff but i dont see why not .

http://www.offroaddesign.com/catalog/motormounts.htm

http://diy4x.com/product.php?product...cat=252&page=1

http://diy4x.com/product.php?product...cat=252&page=1

http://diy4x.com/product.php?product...cat=252&page=1

Houston Ben · 04-13-2019, 05:02 PM

Thank for the reply Mongo and Sweetk30. I really like the LS mounts you provided SweetK30, I have an inquiry to them. All I need it the actual mounts, not the adapters too.

I do wonder about the vibrations though. I switched to solid mounts on my mustang and while noticeable, not really that bad.

Ben

**mongocanfly** · 04-13-2019, 05:37 PM

old57 had poly mounts on his and thought he had a driveline vibration..was told to swap poly for rubber, and his vibration problems went away

Houston Ben · 04-13-2019, 06:29 PM

who makes the best rubber ones?

sprint_9 · 04-13-2019, 09:03 PM

Quote:

Originally Posted by Houston Ben

who makes the best rubber ones?

I used Anchor Industries, I think from what I remember reading is that they were of higher quality compared to some of the other brands. They seemed nice when I installed them but thats as far as I have used them, my truck isnt running yet.

**Wgesnerjr** · 04-15-2019, 05:58 AM

Beware of cheap overseas brands. My buddy and I struggled to get a SBC to mount in his ElCamino due to cheap Chinese mounts. Advice: Don't buy the cheapest set!

sweetk30 · 04-15-2019, 10:48 AM

all the ones i have posted can be swapped to rubber with a simple pair of replacement rubber leaf spring bushings for the size and depth of the tube were the polly goes in .

i did this on a set of drop shackles i had the polley was gone on and i had some rubber leaf spring bushings hanging around from a rubber to polly swap i did . pressed in just fine and they work good and ride just like stock .

toddoky · 04-16-2019, 07:17 PM

Nobody has yet to mention it, so I’ll add that Holley also offers poly inserts for the early GM clamshell mounts and also for the GM 4th-gen F-Body LS1 engine mounts. I mentioned them both since each of them used in the designs of the various Hooker Blackheart LS swap systems. The Hooker Blackheart 73-87 C10 swap engine brackets use the early type clamshells and the engine brackets in the soon to be released 67-72 C10 LS swap system use the LS1 clamshells. They both work well in an LS application. If you don’t want to hassle with drilling out the rivets from the stock clamshell cages, you can also buy the cage halves from Holley, which makes it strictly bolt-in operation.
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04-13-2019, 12:12 PM	#1
Houston Ben Registered User Join Date: May 2013 Location: Houston Texas Posts: 713	Clam shell motor mount question Hi all, I have a 86 C10 5.3 and I think my rubber mounts are done as they are brittle and cracked all over. Just wondering if there is anything new out there besides the energy suspension and store bought rubber mounts. I have tried to search, but can't find what I am looking for exactly. Some say the rubber won't last long, some like the poly and some don't. Any advise? Thanks. __________________ 1986 C10, 2011 5.3 w/6L80, 3.42 w/ Detroit TrutTrac Build thread: http://67-72chevytrucks.com/vboard/s...d.php?t=584532

04-13-2019, 01:14 PM	#2
mongocanfly Post Whore Join Date: May 2015 Location: Alabama Posts: 14,592	Re: Clam shell motor mount question my rubber mounts have been working since 1981..with the 350 and the 6.0..no issues ive been seeing people with poly mounts are having issues with vibrations though __________________ Mongo...aka Greg RIP Dad RIP Jesse 1981 C30 LQ9 NV4500..http://67-72chevytrucks.com/vboard/s...d.php?t=753598 Mongos AD- LS3 TR6060...http://67-72chevytrucks.com/vboard/s...34#post8522334 Columbus..the 1957 IH 4x4...http://67-72chevytrucks.com/vboard/s...63#post8082563 2023 Chevy Z71..daily driver

04-13-2019, 01:41 PM	#3
sweetk30 Registered User Join Date: May 2012 Location: horseheads,ny rust belt Posts: 2,794	Re: Clam shell motor mount question i cant say 100% if they bolt in and work correct on the 2wd stuff but i dont see why not . http://www.offroaddesign.com/catalog/motormounts.htm http://diy4x.com/product.php?product...cat=252&page=1 http://diy4x.com/product.php?product...cat=252&page=1 http://diy4x.com/product.php?product...cat=252&page=1 __________________ 77-k30lb BIG truck build . 87-k30lb budget beater build . 85-k30lb the plow machine build . 85-c10sb summer fun toy . ----------------------------- HOLLEY SNIPER efi = worst case of p.i.t.a i ever had . EDELBROCK pro flo 4 = best deal going so far . love my setup works great.

04-13-2019, 05:02 PM	#4
Houston Ben Registered User Join Date: May 2013 Location: Houston Texas Posts: 713	Re: Clam shell motor mount question Thank for the reply Mongo and Sweetk30. I really like the LS mounts you provided SweetK30, I have an inquiry to them. All I need it the actual mounts, not the adapters too. I do wonder about the vibrations though. I switched to solid mounts on my mustang and while noticeable, not really that bad. Ben __________________ 1986 C10, 2011 5.3 w/6L80, 3.42 w/ Detroit TrutTrac Build thread: http://67-72chevytrucks.com/vboard/s...d.php?t=584532

04-13-2019, 05:37 PM	#5
mongocanfly Post Whore Join Date: May 2015 Location: Alabama Posts: 14,592	Re: Clam shell motor mount question old57 had poly mounts on his and thought he had a driveline vibration..was told to swap poly for rubber, and his vibration problems went away __________________ Mongo...aka Greg RIP Dad RIP Jesse 1981 C30 LQ9 NV4500..http://67-72chevytrucks.com/vboard/s...d.php?t=753598 Mongos AD- LS3 TR6060...http://67-72chevytrucks.com/vboard/s...34#post8522334 Columbus..the 1957 IH 4x4...http://67-72chevytrucks.com/vboard/s...63#post8082563 2023 Chevy Z71..daily driver

04-13-2019, 06:29 PM	#6
Houston Ben Registered User Join Date: May 2013 Location: Houston Texas Posts: 713	Re: Clam shell motor mount question who makes the best rubber ones? __________________ 1986 C10, 2011 5.3 w/6L80, 3.42 w/ Detroit TrutTrac Build thread: http://67-72chevytrucks.com/vboard/s...d.php?t=584532

04-15-2019, 05:58 AM	#8
Wgesnerjr Senior Member Join Date: Jun 2015 Location: Atlanta, GA. Posts: 737	Re: Clam shell motor mount question Beware of cheap overseas brands. My buddy and I struggled to get a SBC to mount in his ElCamino due to cheap Chinese mounts. Advice: Don't buy the cheapest set! __________________ Jay Gesner Atlanta, GA 1985 C10 Long Bed 4X2 LS 5.3, 4L60E Father/Daughter Project

04-15-2019, 10:48 AM	#9
sweetk30 Registered User Join Date: May 2012 Location: horseheads,ny rust belt Posts: 2,794	Re: Clam shell motor mount question all the ones i have posted can be swapped to rubber with a simple pair of replacement rubber leaf spring bushings for the size and depth of the tube were the polly goes in . i did this on a set of drop shackles i had the polley was gone on and i had some rubber leaf spring bushings hanging around from a rubber to polly swap i did . pressed in just fine and they work good and ride just like stock . __________________ 77-k30lb BIG truck build . 87-k30lb budget beater build . 85-k30lb the plow machine build . 85-c10sb summer fun toy . ----------------------------- HOLLEY SNIPER efi = worst case of p.i.t.a i ever had . EDELBROCK pro flo 4 = best deal going so far . love my setup works great.

04-16-2019, 07:17 PM	#10
toddoky Registered User Join Date: Jul 2015 Location: Bowling Green, KY Posts: 264	Re: Clam shell motor mount question Nobody has yet to mention it, so I’ll add that Holley also offers poly inserts for the early GM clamshell mounts and also for the GM 4th-gen F-Body LS1 engine mounts. I mentioned them both since each of them used in the designs of the various Hooker Blackheart LS swap systems. The Hooker Blackheart 73-87 C10 swap engine brackets use the early type clamshells and the engine brackets in the soon to be released 67-72 C10 LS swap system use the LS1 clamshells. They both work well in an LS application. If you don’t want to hassle with drilling out the rivets from the stock clamshell cages, you can also buy the cage halves from Holley, which makes it strictly bolt-in operation. Posted via Mobile Device



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