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10-20-2019, 09:39 AM
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#1 |
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Registered User
 Join Date: Jun 2018
Location: Lucasville,oh
Posts: 61
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Clamshell mount
Working on a 1972 c10 frame with sbc and a little confused about the engine mounts. Did the 72 come with clamshells or the old style. Or both. Thanks.
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10-20-2019, 09:28 PM
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#2 |
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Registered User
Join Date: Dec 1999
Location: Austin, TX, USA
Posts: 7,723
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Re: Clamshell mount
Old style.
__________________
44 Willys MB 52 M38A1 64 Corvette Coupe 68 Camaro 'vert LT1 & TH700 69 Z/28 355 12.6's @110 69 Chevy Short Step 4 1/2"/7" drop 72 Jimmy 4WD 4spd 4" & 35's 02 GMC 2500HD 4x4 Duramax |
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10-21-2019, 05:49 PM
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#3 |
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Registered User
Join Date: Jun 2018
Location: Lucasville,oh
Posts: 61
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Re: Clamshell mount
So whats needed to make the clamshells work. Do i just need the bracket that bolts the to the frame and crossmember from a 73 and up or something different.
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10-21-2019, 06:52 PM
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#4 |
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Senior Member
Join Date: Dec 2013
Location: Gods country East,Tn
Posts: 8,545
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Re: Clamshell mount
I have the whole set that I took off a 67 frame with a small block in it , They used them with Hedman headers .
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__________________
 1967 Factory short bed - Old school '71 - 350 / 4bolt / 487 heads / Edelbrock C3BX Muncie M-22 4 speed / Hurst Comp plus Factory 12 bolt posi 3.73 / 255-70-15 Smoothed firewall / Factory cowl induction Power disc brakes / power steering / 3.5-5" drop |
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10-21-2019, 07:46 PM
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#5 |
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Registered User
Join Date: Dec 1999
Location: Austin, TX, USA
Posts: 7,723
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Re: Clamshell mount
You should be able to get all the parts from a 73-87 truck. 91 for 1/2 ton 2x4 Surubans.
__________________
44 Willys MB 52 M38A1 64 Corvette Coupe 68 Camaro 'vert LT1 & TH700 69 Z/28 355 12.6's @110 69 Chevy Short Step 4 1/2"/7" drop 72 Jimmy 4WD 4spd 4" & 35's 02 GMC 2500HD 4x4 Duramax |
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10-27-2019, 05:41 PM
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#6 |
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Registered User
Join Date: Jun 2018
Location: Lucasville,oh
Posts: 61
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Re: Clamshell mount
Anyone know where i can find a set of the 73-87 frame perches. I assume they need to be from a c10 and not a car.
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10-27-2019, 06:03 PM
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#7 |
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Registered User
Join Date: Sep 2011
Location: Ark City, Kansas
Posts: 3,385
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Re: Clamshell mount
72 small blocks were same as 67-71, for small blocks.
72 big blocks got the clam shell type mounts. The mounts use frame brackets made for 72 big block clamshell moouts, only. The 73-87 frame brackets that all use clam shell mounts are different from the 72 big block frame brackets. I've read ere about others using 73-87 brackets/clem shell mouts. takes a little fabrication, nothing terribly difficult... Where to get them? There's kajillions of square bodies in salvage yards... |
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10-27-2019, 07:56 PM
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#8 |
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Registered User
Join Date: Aug 2012
Location: St. Croix River Valley, WI
Posts: 795
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Re: Clamshell mount
What's the benefit to these "clamshell" mounts? I'm kind of a noob at the 73-on trucks...
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Meet "Old Roy": http://67-72chevytrucks.com/vboard/s...d.php?t=707801 |
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10-28-2019, 08:45 AM
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#9 | |
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Registered User
Join Date: Sep 2011
Location: Ark City, Kansas
Posts: 3,385
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Re: Clamshell mount
Quote:
The old mounts are two piece of steel with a piece of rubber between them, essentially bonded to both pieces of steel. Age, heat and the engines movement eventually allow one of the pieces of steel to come unbonded. It's usually the drivers side. You can feel the engine lift off the mount, then slam back down when this happens. Sometimes you lose the rubber, then you really know what's up. When you lose the rubber the fan usually gets into the fan shroud. This can't happen with the clam shell mount... |
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10-28-2019, 10:02 AM
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#10 |
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Registered User
Join Date: Apr 2011
Location: formerly NY currentlyNC
Posts: 390
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Re: Clamshell mount
when the mounts broke and the engine lifted up the throttles could stick..probably the reason they went to a throttle cable instead of regular linkage....the factory recall was a halfast piece of cable to limit travel...so if you've ever seen one of these cable setups and wondered wtf....
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1970 short step c10 leaf spring 454 |
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10-28-2019, 06:44 PM
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#11 |
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Registered User
Join Date: Jun 2018
Location: Lucasville,oh
Posts: 61
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Re: Clamshell mount
I'm in southern ohio and none of the yards have older stuff. Anyone on here have a set
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10-27-2019, 09:25 PM
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#12 |
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Registered User
Join Date: Jan 2010
Location: Here
Posts: 5,537
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Re: Clamshell mount
Will the small blocks work and sit in the same stock position they are supposed to be in if I used the 72 big block clam shell mounts with a 327? It's a 67 frame so if anyone has done this will I need to shave the frame sides?
Last edited by chewychevy67; 10-27-2019 at 09:31 PM. |
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