Change Sb Towers To Bb Towers Problem - The 1947 - Present Chevrolet & GMC Truck Message Board Network

ira ashley · 10-12-2003, 07:25 PM

I CHANGED SB TOWER FOR BB TOWERS; EVERYTHING BOLTED WITH NO PROBLEM. MY PROBLEM IS I CAN NOT GET THE 402 MOTOR WITH MOTOR MOUNT BRACKETS TO FIT ON TO THE MOTOR MOUNT WHICH ARE BOLTED TO THE TOWERS. THE MOTOR LIKES ABOUT 1/2" GOING IN ON BOTH SIDES (THE TRANNY IS A 400TH & IS BOLTED IN PLACE).....WHAT I'M I DOING WRONG?????
THE 402 WITH ALL THE BRACKETS DONOR TRUCK WAS A 72 C30, THE TRUCK I'M PUT THE 402 IN IS A 71 C10........MAYBE I HAVE THE TOWER ON WRONG? NEED HELP!
THANKS IRA

**fine69** · 10-12-2003, 07:32 PM

Ok. Many times when during assembly at the plants stuff isnt totally tightened until the parts are all together.
I work in Auto Assembly at Honda of America in Marysville,Ohio.
So i have an very good perspective on this. As well as from working in my shop.
Loosen up the engine mount bolts. As well as the mounts on the brackets. Then put the engine in. Chances are you will be able to get the mounts on. Then finish tightening everything up.

Longhorn Man · 10-12-2003, 10:35 PM

The motor mounts on the 72, are they the original mounts?
What year big block towers you using?
72 was a one year only type of motor mounts and towers.

ira ashley · 10-13-2003, 07:30 AM

Everything is out of a 72 C30.
If the 72 towers are different, how do you make them work? Why do they bolt up in a 71 frame with no problem?
Ira

Longhorn Man · 10-13-2003, 11:28 PM

That I can not answer.
TTT for some one who can answer this.

After thinking for a moment, I do know the C/30 frame is taller. I DON'T know (rather can't remember) if that maters when it comes to the motor mount towers or not.

dinnut · 10-13-2003, 11:31 PM

find 71 towers?

**GMCPaul** · 10-14-2003, 05:21 AM

1972 BB 1/2ton-1ton frame engine mounts are all the same no difference by weight rating, 72 BB frame engine mounts will install in 68-71 trucks without modification, but you must use the 1 piece 72 engine mounts attached to the motor.
68-71 BB 1/2ton-1ton frame engine mounts are all the same no difference by weight rating, 68-71 BB frame engine mounts will install in 72 trucks without modification, but you must use the 5 piece 68-71 engine mounts attached to the motor.
73 up BB frame towers differ from both 68-71 style, and 1972 style though they look very similar to the 72's.
I would assume that its 1 of these 3 towers you are using and just have the wrong engine mounts installed on the motor for the year of frame tower you found and are using.
Just because you pulled the motor from a 72 does not mean that its a original 72 setup. Upgrading to a BB is very popular and everyone doesn't always use the exact year style that there truck is.
Think back to when you pulled the towers was motor mounted on a 1piece motor mount to the tower or a 5piece? Then use exactly the same.
If it was in a 72 it will go in yours also, the donor truck being a 1 ton does not matter.
All the above mounts can also be installed in a 67 but the drivers side frame rail will need to be notched like 68-72 frames are to clear the engine tower at the frame.
GMCPaul

44th Miss Inf · 10-14-2003, 11:18 AM

Ira,
Can you get us any pics of the mounts / frame brackets?

Maybe we can help get you sorted out. (Plus it helps ME if I can look at it)

Virgil

**Classic Heartbeat** · 10-14-2003, 04:15 PM

I have done this conversion to 2 67s and Paul is correct, however both sides of the frame need to be notched to fit the 72 towers. I explain all of it verry well in our Panel Project section of our website. There are pictures and explanations to what and why the work had to be done. Here is a link: http://www.classicheartbeat.com/67_panel_project.htm
Lots of good information in there.
WES www.ClassicHeartbeat.com

ira ashley · 10-14-2003, 09:35 PM

Thanks to everyone
I got them to fit; whiched the left frame mount to the right bolted right up"had to use the back hole on the bottom of the mount . moved the mount all the way to the front & the motor fit right in with a little adjusting. Ira

**BIG ORANGE** · 10-14-2003, 09:44 PM

YEAH!!!!!!!!!!!!!!! Congrats another BB live and runs in our trucks,I LOVE it when we have a happy ending.lol

**Tim Christian** · 10-14-2003, 10:13 PM

Hey Ira, Looking Good! I can wait to see it with the cowl hood and finshed. I am going to be at the Bristol Bash this week end you coming down?

10-12-2003, 07:25 PM	#1
ira ashley Registered User Join Date: Feb 2000 Location: va Posts: 91	Change Sb Towers To Bb Towers Problem I CHANGED SB TOWER FOR BB TOWERS; EVERYTHING BOLTED WITH NO PROBLEM. MY PROBLEM IS I CAN NOT GET THE 402 MOTOR WITH MOTOR MOUNT BRACKETS TO FIT ON TO THE MOTOR MOUNT WHICH ARE BOLTED TO THE TOWERS. THE MOTOR LIKES ABOUT 1/2" GOING IN ON BOTH SIDES (THE TRANNY IS A 400TH & IS BOLTED IN PLACE).....WHAT I'M I DOING WRONG????? THE 402 WITH ALL THE BRACKETS DONOR TRUCK WAS A 72 C30, THE TRUCK I'M PUT THE 402 IN IS A 71 C10........MAYBE I HAVE THE TOWER ON WRONG? NEED HELP! THANKS IRA

10-13-2003, 07:30 AM	#4
ira ashley Registered User Join Date: Feb 2000 Location: va Posts: 91	towers Everything is out of a 72 C30. If the 72 towers are different, how do you make them work? Why do they bolt up in a 71 frame with no problem? Ira

10-13-2003, 11:31 PM	#6
dinnut Registered User Join Date: Apr 2003 Location: missouri city, tx Posts: 4,486	find 71 towers? __________________ 70 longbed 496/th400/Ford 9"

10-14-2003, 05:21 AM	#7
GMCPaul Senior Member Join Date: Mar 2000 Location: Rockville,In. USA Posts: 3,721	1972 BB 1/2ton-1ton frame engine mounts are all the same no difference by weight rating, 72 BB frame engine mounts will install in 68-71 trucks without modification, but you must use the 1 piece 72 engine mounts attached to the motor. 68-71 BB 1/2ton-1ton frame engine mounts are all the same no difference by weight rating, 68-71 BB frame engine mounts will install in 72 trucks without modification, but you must use the 5 piece 68-71 engine mounts attached to the motor. 73 up BB frame towers differ from both 68-71 style, and 1972 style though they look very similar to the 72's. I would assume that its 1 of these 3 towers you are using and just have the wrong engine mounts installed on the motor for the year of frame tower you found and are using. Just because you pulled the motor from a 72 does not mean that its a original 72 setup. Upgrading to a BB is very popular and everyone doesn't always use the exact year style that there truck is. Think back to when you pulled the towers was motor mounted on a 1piece motor mount to the tower or a 5piece? Then use exactly the same. If it was in a 72 it will go in yours also, the donor truck being a 1 ton does not matter. All the above mounts can also be installed in a 67 but the drivers side frame rail will need to be notched like 68-72 frames are to clear the engine tower at the frame. GMCPaul __________________ Secure Online Catalog for-GMCPauls Truck Parts Email- GMCPAULS@GMAIL.COM

10-14-2003, 04:15 PM	#9
Classic Heartbeat Project Junkie! Fishing Poor!! Join Date: Dec 1999 Location: Olympia,Wa. 98512 Posts: 10,766	I have done this conversion to 2 67s and Paul is correct, however both sides of the frame need to be notched to fit the 72 towers. I explain all of it verry well in our Panel Project section of our website. There are pictures and explanations to what and why the work had to be done. Here is a link: http://www.classicheartbeat.com/67_panel_project.htm Lots of good information in there. WES www.ClassicHeartbeat.com __________________ On-line catolog Classic Heartbeat Pickup Parts WEHEPP@comcast.net Call us Toll Free (888) 338-2502 Like Us on Facebook No appointment necessary. 72 BB Chevy Custom Deluxe / Custom Camper 67 I-6 (Soon to be 5.7 LS1) Panel 68 BB Chevy Short Bed 72 6.0 LQ9 Short Bed Chevy 4X4 Olympia's fastest growing truck parts supplier. Olympia's home for Wayward Chevys

10-12-2003, 07:32 PM	#2
fine69 Senior Member Join Date: Dec 1999 Location: Urbana,Ohio,USA Posts: 4,618	Ok. Many times when during assembly at the plants stuff isnt totally tightened until the parts are all together. I work in Auto Assembly at Honda of America in Marysville,Ohio. So i have an very good perspective on this. As well as from working in my shop. Loosen up the engine mount bolts. As well as the mounts on the brackets. Then put the engine in. Chances are you will be able to get the mounts on. Then finish tightening everything up.

10-12-2003, 10:35 PM	#3
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,690	The motor mounts on the 72, are they the original mounts? What year big block towers you using? 72 was a one year only type of motor mounts and towers.

10-13-2003, 11:28 PM	#5
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,690	That I can not answer. TTT for some one who can answer this. After thinking for a moment, I do know the C/30 frame is taller. I DON'T know (rather can't remember) if that maters when it comes to the motor mount towers or not.

10-14-2003, 11:18 AM	#8
44th Miss Inf Registered User Join Date: Sep 2002 Location: Liberty, Mississippi Posts: 672	Ira, Can you get us any pics of the mounts / frame brackets? Maybe we can help get you sorted out. (Plus it helps ME if I can look at it) Virgil

10-14-2003, 09:35 PM	#10
ira ashley Registered User Join Date: Feb 2000 Location: va Posts: 91	72bb mount on 71 frame Thanks to everyone I got them to fit; whiched the left frame mount to the right bolted right up"had to use the back hole on the bottom of the mount . moved the mount all the way to the front & the motor fit right in with a little adjusting. Ira Attached Images

10-14-2003, 09:44 PM	#11
BIG ORANGE Senior Member Join Date: Oct 2001 Location: Lancaster S.C. Posts: 4,767	YEAH!!!!!!!!!!!!!!! Congrats another BB live and runs in our trucks,I LOVE it when we have a happy ending.lol __________________ Things happen for a reason!

10-14-2003, 10:13 PM	#12
Tim Christian Senior Member Join Date: Dec 1999 Location: TN/VA Posts: 6,388	Hey Ira, Looking Good! I can wait to see it with the cowl hood and finshed. I am going to be at the Bristol Bash this week end you coming down?

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