72 Big block motor mount questions - The 1947 - Present Chevrolet & GMC Truck Message Board Network

1972SUPERSB · 01-07-2013, 05:34 PM

I have a 72 with the 350 installed and will be swapping it out for a big block. I am thinking of just buying the 72 only big block stands and clamshells and new rubber motor mounts. Will this work ok? Also why are the big block stands different from the 67-71 and the 72 only? Are the frame holes different or something for the 72 year? Does the 72 only stand make the engine sit a little different in the engine bay than the 67-71 stands? I dont wanna use my small block stands because I have read they have header clearance problems. What are the benefits or any of using the 67-71 stands or the 72 only stand? Thanks

Shyguy · 01-07-2013, 06:38 PM

We used '74 454 mounts and stands in my '69 frame to give plenty of clearance for the headers and clutch linkage.

We did have to drill different holes in the frame and cradle so we would not have to move the transmission and not modify the driveshaft.

sanford&daughter · 01-07-2013, 06:59 PM

If you can find them go with the 72 frame stands over the 68-71 stands. the mounts for the 72 are about 20 each but the 68-71 mounts are about 90 each iirc either stand should be a direct bolt in with no mods check the parts board I'm sure someone will have some for sale
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1972SUPERSB · 01-07-2013, 08:22 PM

Quote:

Originally Posted by sanford&daughter

If you can find them go with the 72 frame stands over the 68-71 stands. the mounts for the 72 are about 20 each but the 68-71 mounts are about 90 each iirc either stand should be a direct bolt in with no mods check the parts board I'm sure someone will have some for sale
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Yeah I have read the 72 mounts are cheaper. Do you know what they changed the towers in 72?
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sanford&daughter · 01-07-2013, 09:19 PM

I'm not sure why the changed the stands in 72 maybe the mounts are stronger? I'm sure someone will chim in with the correct answer

**WIDESIDE72** · 01-08-2013, 01:39 AM

The 72 BB stands use mounts with bolts running thorugh them horizontally like post 73 mounts, instead of the bolts mounting vertically like the 67-71 SB mounts. There was a recall back in the day and the dealers installed a cable to keep the engine in place in case of a broken mount, which could cause the throttle linkage to bind up, which I am sure you are aware, is not good if the throttle is at anything more than idle. Check out the FAQ section. One of the members has a mod that lets you use a cheaper 67-71 SB biscuit on the BB 68-71 towers.

1972SUPERSB · 01-08-2013, 10:18 AM

Thanks everybody for the responses. Now I know. Thanks
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01-07-2013, 05:34 PM	#1
1972SUPERSB Registered User Join Date: Sep 2012 Location: San Antonio, TX Posts: 1,026	72 Big block motor mount questions I have a 72 with the 350 installed and will be swapping it out for a big block. I am thinking of just buying the 72 only big block stands and clamshells and new rubber motor mounts. Will this work ok? Also why are the big block stands different from the 67-71 and the 72 only? Are the frame holes different or something for the 72 year? Does the 72 only stand make the engine sit a little different in the engine bay than the 67-71 stands? I dont wanna use my small block stands because I have read they have header clearance problems. What are the benefits or any of using the 67-71 stands or the 72 only stand? Thanks __________________ Jeff 1972 Cheyenne Super SWB 350, Auto, Bucket Seats w/Console, Tach, Factory A/C, P/S ,P/B, Tilt 1998 Chevy 1500 Ext Cab 5.7, Pewter w/blue interior

01-07-2013, 06:38 PM	#2
Shyguy Junior Member Join Date: Dec 2006 Location: Southeast Missouri Posts: 2,436	Re: 72 Big block motor mount questions We used '74 454 mounts and stands in my '69 frame to give plenty of clearance for the headers and clutch linkage. We did have to drill different holes in the frame and cradle so we would not have to move the transmission and not modify the driveshaft. __________________ '67 Chevy C-20 short stepper - build complete, 454/SM-465. '75 C-30 Single Cab DRW-350 small block/NP-435. '77 GMC-6500 Dump Truck, 427 Tall Deck. '92 GMC K-3500 Duallie, 454/4L80E.

01-07-2013, 06:59 PM	#3
sanford&daughter Registered User Join Date: Dec 2012 Location: Upstate , New York Posts: 647	Re: 72 Big block motor mount questions If you can find them go with the 72 frame stands over the 68-71 stands. the mounts for the 72 are about 20 each but the 68-71 mounts are about 90 each iirc either stand should be a direct bolt in with no mods check the parts board I'm sure someone will have some for sale Posted via Mobile Device

01-07-2013, 09:19 PM	#5
sanford&daughter Registered User Join Date: Dec 2012 Location: Upstate , New York Posts: 647	Re: 72 Big block motor mount questions I'm not sure why the changed the stands in 72 maybe the mounts are stronger? I'm sure someone will chim in with the correct answer

01-08-2013, 01:39 AM	#6
WIDESIDE72 Senior Member Join Date: Aug 2008 Location: Cedar Park, Texas Posts: 7,494	Re: 72 Big block motor mount questions The 72 BB stands use mounts with bolts running thorugh them horizontally like post 73 mounts, instead of the bolts mounting vertically like the 67-71 SB mounts. There was a recall back in the day and the dealers installed a cable to keep the engine in place in case of a broken mount, which could cause the throttle linkage to bind up, which I am sure you are aware, is not good if the throttle is at anything more than idle. Check out the FAQ section. One of the members has a mod that lets you use a cheaper 67-71 SB biscuit on the BB 68-71 towers.

01-08-2013, 10:18 AM	#7
1972SUPERSB Registered User Join Date: Sep 2012 Location: San Antonio, TX Posts: 1,026	Re: 72 Big block motor mount questions Thanks everybody for the responses. Now I know. Thanks Posted via Mobile Device __________________ Jeff 1972 Cheyenne Super SWB 350, Auto, Bucket Seats w/Console, Tach, Factory A/C, P/S ,P/B, Tilt 1998 Chevy 1500 Ext Cab 5.7, Pewter w/blue interior



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