motor mount update ? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

kspops · 09-13-2003, 02:14 PM

Hello to all, I am wondering if anyone has installed the newer motor mounts (73-87) in this vintage of trucks. If so , what type of donor vehicle? (Small Block V-8) Thanks, Ed

crazy longhorn · 09-13-2003, 09:13 PM

They wont be a direct bolt in, you will need to redrill the holes in the frame,it but should work out. Im not sure if the eng brackets are different from BB to SB, but the frame stands should be the same 73 - late 70s at least. the stands have several different sets of holes. I have used the stands & deisel brackets/mounts to install a BB olds in my longhorn......I redrilled the top of the frame to bolt them down, & opted to weld the stands on the crossmember(the eng was already positioned). Good luck,crazyL

Dean23 · 09-13-2003, 09:14 PM

the mount towers are taller on a 73 and up....u will need to build a spacer and drill a couple new holes

crazy longhorn · 09-13-2003, 10:25 PM

I didnt have a height issue on the stands I used, they came off a 77 with a 5.7 deisel. Dean, were the stands too tall to lay on the top of the frame rails?

Dean23 · 09-13-2003, 10:39 PM

ya they were tootall to fit in
i have seen another 67-72 withthem in and he has a spacer as well

crazy longhorn · 09-13-2003, 10:47 PM

Its been a while since I did that swap......trying to streeech the memory! The bottom (rear i beleive ) didnt sit right on the crossmember.......I heated & dimpled a spot ea side on the crossmember, & the top laid flat on the top edge of the frame. I think i got 1 hole to line up on the top on ea side, & had to drill the rest. Just curious....how much spacer did you need to use? crazyL

Dean23 · 09-14-2003, 11:10 AM

i believe you need just under an inch of spacer

crazy longhorn · 09-14-2003, 11:17 AM

Wow! Thats a bunch of spacer......I didnt see that problem, I wonder what was different? crazyL

Dean23 · 09-14-2003, 12:06 PM

the towers i usesd were out of a 79 truck so im not sure

onetoncrewcab · 09-14-2003, 02:08 PM

Guys, I am amazed at this post! This is EXACTLY what I was dealing with yesterday! I was going to start a post today on this very topic.

I had taken the engine cradle and disk brakes out of a 78 Suburban and bolted them into my 70 pickup. Imagine my disappointment when I found the newer towers do not bolt in. The frame on the 70 is a 1/2" shorter than the 78.

I was thinking of using spacers at the top of the towers, but I wasn't sure that was the answer. But it appears to be. I'll figure out what I need for a spacer and just have a chunk of bar the appropriate thickness and cut it to length. Use some grade 8 fasteners and I should be set. My original plan was to bolt the towers at the top and drill new holes at the bottom. I was going to reposition the motor mounts on the towers until everything sat where it needed to be. I don't think this is going to work as the engine sits too high in the engine bay.

Worse yet, I was going to just reuse the old towers from the 70, but I can't find them.

But I prefer the newer motor mounts anyway.

If I get time, I'll go down to the shop and get a pic of what it looks like now.

Later
Mike

Dean23 · 09-14-2003, 02:18 PM

The other option is too cut the towers and reweld them. but id be worried about the strength. They are to tall so what i will probably do is get a spacer fabricated and install it
I wonder why some of the towers are shorter then the others. One would think the tower would all be a standard height on all of them.

crazy longhorn · 09-14-2003, 04:11 PM

My longhorn has a different frame than the other 67-72s......I didnt think it was different in the nose area, but it might be

I do know that the rails are taller starting just ahead of the firewall, & on back. At the trans crossmember, the frame is 8" tall, then tapers to 7" till it kicks up to go over the rear axle, then tapers down to about 5" in height. crazyL

09-13-2003, 02:14 PM	#1
kspops Registered User Join Date: Jun 2003 Location: Tampa, Fl. Posts: 6	motor mount update ? Hello to all, I am wondering if anyone has installed the newer motor mounts (73-87) in this vintage of trucks. If so , what type of donor vehicle? (Small Block V-8) Thanks, Ed

09-13-2003, 09:13 PM	#2
crazy longhorn Fabricate till you "puke" Join Date: Jun 2002 Location: Ill Posts: 9,402	They wont be a direct bolt in, you will need to redrill the holes in the frame,it but should work out. Im not sure if the eng brackets are different from BB to SB, but the frame stands should be the same 73 - late 70s at least. the stands have several different sets of holes. I have used the stands & deisel brackets/mounts to install a BB olds in my longhorn......I redrilled the top of the frame to bolt them down, & opted to weld the stands on the crossmember(the eng was already positioned). Good luck,crazyL __________________ 69 longhorn,4" chop,3/5 drop, 1/2 ton suspension/disc brakes,1 1/2" body drop,steel tilt clip, 5.3/Edelbrock rpm intake/600 carb, Hooker streetrod shorties,2 1/2" exhaust/ H pipe/50's Flows , 6 spd Richmond trans,12 bolt/ 3.40 gears....

09-13-2003, 09:14 PM	#3
Dean23 68cst_ss490 Join Date: May 2001 Location: edmonton,canada Posts: 1,363	the mount towers are taller on a 73 and up....u will need to build a spacer and drill a couple new holes __________________ Dean edmonton,canada a winter wonderland 2005 Chevrolet Avalanche LT cold air intake, performance exhaust, Comp cams cam, jba shorty ceramic headers. http://www.cardomain.com/ride/3090973

09-13-2003, 10:25 PM	#4
crazy longhorn Fabricate till you "puke" Join Date: Jun 2002 Location: Ill Posts: 9,402	I didnt have a height issue on the stands I used, they came off a 77 with a 5.7 deisel. Dean, were the stands too tall to lay on the top of the frame rails? __________________ 69 longhorn,4" chop,3/5 drop, 1/2 ton suspension/disc brakes,1 1/2" body drop,steel tilt clip, 5.3/Edelbrock rpm intake/600 carb, Hooker streetrod shorties,2 1/2" exhaust/ H pipe/50's Flows , 6 spd Richmond trans,12 bolt/ 3.40 gears....

09-13-2003, 10:39 PM	#5
Dean23 68cst_ss490 Join Date: May 2001 Location: edmonton,canada Posts: 1,363	ya they were tootall to fit in i have seen another 67-72 withthem in and he has a spacer as well __________________ Dean edmonton,canada a winter wonderland 2005 Chevrolet Avalanche LT cold air intake, performance exhaust, Comp cams cam, jba shorty ceramic headers. http://www.cardomain.com/ride/3090973

09-13-2003, 10:47 PM	#6
crazy longhorn Fabricate till you "puke" Join Date: Jun 2002 Location: Ill Posts: 9,402	Its been a while since I did that swap......trying to streeech the memory! The bottom (rear i beleive ) didnt sit right on the crossmember.......I heated & dimpled a spot ea side on the crossmember, & the top laid flat on the top edge of the frame. I think i got 1 hole to line up on the top on ea side, & had to drill the rest. Just curious....how much spacer did you need to use? crazyL __________________ 69 longhorn,4" chop,3/5 drop, 1/2 ton suspension/disc brakes,1 1/2" body drop,steel tilt clip, 5.3/Edelbrock rpm intake/600 carb, Hooker streetrod shorties,2 1/2" exhaust/ H pipe/50's Flows , 6 spd Richmond trans,12 bolt/ 3.40 gears....

09-14-2003, 11:10 AM	#7
Dean23 68cst_ss490 Join Date: May 2001 Location: edmonton,canada Posts: 1,363	i believe you need just under an inch of spacer __________________ Dean edmonton,canada a winter wonderland 2005 Chevrolet Avalanche LT cold air intake, performance exhaust, Comp cams cam, jba shorty ceramic headers. http://www.cardomain.com/ride/3090973

09-14-2003, 11:17 AM	#8
crazy longhorn Fabricate till you "puke" Join Date: Jun 2002 Location: Ill Posts: 9,402	Wow! Thats a bunch of spacer......I didnt see that problem, I wonder what was different? crazyL __________________ 69 longhorn,4" chop,3/5 drop, 1/2 ton suspension/disc brakes,1 1/2" body drop,steel tilt clip, 5.3/Edelbrock rpm intake/600 carb, Hooker streetrod shorties,2 1/2" exhaust/ H pipe/50's Flows , 6 spd Richmond trans,12 bolt/ 3.40 gears....

09-14-2003, 12:06 PM	#9
Dean23 68cst_ss490 Join Date: May 2001 Location: edmonton,canada Posts: 1,363	the towers i usesd were out of a 79 truck so im not sure __________________ Dean edmonton,canada a winter wonderland 2005 Chevrolet Avalanche LT cold air intake, performance exhaust, Comp cams cam, jba shorty ceramic headers. http://www.cardomain.com/ride/3090973

09-14-2003, 02:08 PM	#10
onetoncrewcab One of my kids. Cute eh? Join Date: Oct 2001 Location: Mitchell, SD Posts: 1,286	Guys, I am amazed at this post! This is EXACTLY what I was dealing with yesterday! I was going to start a post today on this very topic. I had taken the engine cradle and disk brakes out of a 78 Suburban and bolted them into my 70 pickup. Imagine my disappointment when I found the newer towers do not bolt in. The frame on the 70 is a 1/2" shorter than the 78. I was thinking of using spacers at the top of the towers, but I wasn't sure that was the answer. But it appears to be. I'll figure out what I need for a spacer and just have a chunk of bar the appropriate thickness and cut it to length. Use some grade 8 fasteners and I should be set. My original plan was to bolt the towers at the top and drill new holes at the bottom. I was going to reposition the motor mounts on the towers until everything sat where it needed to be. I don't think this is going to work as the engine sits too high in the engine bay. Worse yet, I was going to just reuse the old towers from the 70, but I can't find them. But I prefer the newer motor mounts anyway. If I get time, I'll go down to the shop and get a pic of what it looks like now. Later Mike __________________ If a kid asks where rain comes from, I think a cute thing to tell him is “God is crying.” And if he asks why God is crying, another cute thing to tell him is “Probably because of something you did. John 3:16 2006 Chevy HHR 2000 Dodge Durango 1985 Jeep CJ-7 1970 Chevy Pickup

09-14-2003, 02:18 PM	#11
Dean23 68cst_ss490 Join Date: May 2001 Location: edmonton,canada Posts: 1,363	The other option is too cut the towers and reweld them. but id be worried about the strength. They are to tall so what i will probably do is get a spacer fabricated and install it I wonder why some of the towers are shorter then the others. One would think the tower would all be a standard height on all of them. __________________ Dean edmonton,canada a winter wonderland 2005 Chevrolet Avalanche LT cold air intake, performance exhaust, Comp cams cam, jba shorty ceramic headers. http://www.cardomain.com/ride/3090973

09-14-2003, 04:11 PM	#12
crazy longhorn Fabricate till you "puke" Join Date: Jun 2002 Location: Ill Posts: 9,402	My longhorn has a different frame than the other 67-72s......I didnt think it was different in the nose area, but it might be I do know that the rails are taller starting just ahead of the firewall, & on back. At the trans crossmember, the frame is 8" tall, then tapers to 7" till it kicks up to go over the rear axle, then tapers down to about 5" in height. crazyL __________________ 69 longhorn,4" chop,3/5 drop, 1/2 ton suspension/disc brakes,1 1/2" body drop,steel tilt clip, 5.3/Edelbrock rpm intake/600 carb, Hooker streetrod shorties,2 1/2" exhaust/ H pipe/50's Flows , 6 spd Richmond trans,12 bolt/ 3.40 gears....

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