bb motor swap - The 1947 - Present Chevrolet & GMC Truck Message Board Network

byrd32 · 01-25-2004, 11:17 PM

i own a 72 c10 that had a sb and am putting a bb in it. I've taken it and the weak single bolt through the middle motor mounts out along with the chairs (frame mounts). I have purchased a set (from junk yard) of 1970 c10 402 frame mounts.. they bolt right up to the cross member and frame.... but there's four bolt holes on there (just wait).
when i go and purchase the motor mounts from the parts store - they're pretty standard - the three bolts holes fit the motor then there's a large rubber pad and a hole on each side where the 5" bolt goes through running front to back once the motor is set in the truck... well what i can't find anywhere is the part that bolts to the frame mount and accepts the motor mount w. the 5" bolt. Anyone have any suggestions as to who has a schematic of this or who manufactures it now? as chevrolet has discontinued manufacture of the lower vintage assemblies. (btw - and no classic and the regular parts guys don't have or barely know what i'm even talking about) (and it's not a hybrid system like the 76 models w/ bb's that use the new mounts with the old plates)

hobby67stepside · 01-25-2004, 11:36 PM

I'd like to help, but for my BB installation I bought the BB towers and GM engine mounts. There is a 1/2" bolt that goes thru the tower into the GM engine mount. The way I did it was not cheap. The BB towers were $100 for the pair and the mounts were $200/pr and I understand they are considerably higher now. I think I know the configuration of what you are doing, but can't help with specifics. Sorry.

Longhorn Man · 01-26-2004, 01:04 AM

byrd, you able to get pics?
It sounds like you may have towers and mounts that are not of the same year.

Longhorn Man · 01-27-2004, 01:40 AM

Can anyone show pics of the big block mounts from the variouse years?
I was hoping my responce would prompt a responce from some one who knows big blocks.

*Javy* · 01-27-2004, 02:20 AM

I was in your exact situation about 1 year ago.
The motor mounts that bolt to your engine block are dealer items.
Even though they have been discontinued,you can still find them
at certain dealers.I bought mine at a Chevy dealer in Cerritos,CA
for $120.00 each.

hobby67stepside is 100% correct.
You won't use that 5" bolt.

72 CustomCamper · 01-27-2004, 03:09 AM

I wish I could help, but when I did my BB swap I used the small block towers and mounts. I figure if they held up to the torque of a Diesel they'll handel the torque of a bild big block...

Chuck

72 CustomCamper · 01-27-2004, 03:10 AM

Hey byrd32 you're not too far down the road from me. Ever get up to Fredericksburg???

Chuck

Orence1 · 01-27-2004, 04:24 AM

I just converted my 72 from SB to BB. I used the 72 towers. I will try to get some pictures tomorrow and post them.
Larry

Tx Firefighter · 01-27-2004, 11:58 AM

these are the proper pre-72 style frame mounts.

Tx Firefighter · 01-27-2004, 12:00 PM

Bram · 01-27-2004, 01:11 PM

byrd32, I have a set of 72 Big Block towers with new Big Block motor mounts on them for sale, $300.00 + shipping. Let me know if you want them.

**TxGary** · 01-27-2004, 08:55 PM

Here is a picture of the 72 big block frame mounts.

Primered_69 · 01-27-2004, 09:28 PM

What is the difference between those and ones in 73 up big block truck mounts? Is it just a matter or originality. Withh the other ones bolt up to our crossmembers?

Longhorn Man · 01-28-2004, 12:42 AM

The 73 and up are a little different.

Longhorn Man · 01-28-2004, 12:43 AM

ANd this one you can see the lower portion too...ignore the cut off corner, I had to do that with the caddy swap.

Bram · 01-28-2004, 11:15 AM

byrd32, here are some pic's of the 72 Big Block towers with the motor mounts.

byrd32 · 01-28-2004, 10:00 PM

I just want to thank everyone for responding to my thread out here... You guys are awesome. The camaraderie and esprit de corps of the people that visit this site (new members and regulars) and that have been helping me is far above and beyond what any dealership would ever be or become. You guys are all like second family... If I can ever be of assistance to anyone mail me. I finally am informed and know what I need for my project. Thanks a million to every one.

Eric Byrd

*Javy* · 02-02-2004, 07:42 AM

Which mounts did you decide to use ?

BigDaddyCMU · 04-12-2004, 08:43 PM

As far as I know, the motor mounts for those 70 bb towers are around $60 each, and I didn't think they were available at regular old parts stores. That's the toss up between the two. The 68-71 towers are cheap, but the mounts are expensive. The 72 towers are expensive, but the mounts are cheap.

01-25-2004, 11:17 PM	#1
byrd32 Registered User Join Date: Jan 2004 Location: richmond, va Posts: 7	bb motor swap i own a 72 c10 that had a sb and am putting a bb in it. I've taken it and the weak single bolt through the middle motor mounts out along with the chairs (frame mounts). I have purchased a set (from junk yard) of 1970 c10 402 frame mounts.. they bolt right up to the cross member and frame.... but there's four bolt holes on there (just wait). when i go and purchase the motor mounts from the parts store - they're pretty standard - the three bolts holes fit the motor then there's a large rubber pad and a hole on each side where the 5" bolt goes through running front to back once the motor is set in the truck... well what i can't find anywhere is the part that bolts to the frame mount and accepts the motor mount w. the 5" bolt. Anyone have any suggestions as to who has a schematic of this or who manufactures it now? as chevrolet has discontinued manufacture of the lower vintage assemblies. (btw - and no classic and the regular parts guys don't have or barely know what i'm even talking about) (and it's not a hybrid system like the 76 models w/ bb's that use the new mounts with the old plates)

01-27-2004, 02:20 AM	#5
Javy Account Suspended Join Date: Jan 2004 Posts: 129	byrd32 I was in your exact situation about 1 year ago. The motor mounts that bolt to your engine block are dealer items. Even though they have been discontinued,you can still find them at certain dealers.I bought mine at a Chevy dealer in Cerritos,CA for $120.00 each. hobby67stepside is 100% correct. You won't use that 5" bolt. Last edited by Javy; 01-27-2004 at 02:25 AM.

01-27-2004, 03:09 AM	#6
72 CustomCamper huh ??? Join Date: Nov 2002 Location: Fredericksburg,Va. Posts: 3,369	I wish I could help, but when I did my BB swap I used the small block towers and mounts. I figure if they held up to the torque of a Diesel they'll handel the torque of a bild big block... Chuck __________________ 90 Blazer Silverado 350w/ 700R4 and 32" Kelly's "I am a bomb technician. If you see me running try to keep up!"

01-27-2004, 03:10 AM	#7
72 CustomCamper huh ??? Join Date: Nov 2002 Location: Fredericksburg,Va. Posts: 3,369	Hey byrd32 you're not too far down the road from me. Ever get up to Fredericksburg??? Chuck __________________ 90 Blazer Silverado 350w/ 700R4 and 32" Kelly's "I am a bomb technician. If you see me running try to keep up!"

01-27-2004, 11:58 AM	#9
Tx Firefighter Watch out for your cornhole ! Join Date: Jun 2003 Location: Azle, Texas Posts: 14,162	these are the proper pre-72 style frame mounts. __________________ I'm on the Instagram- @Gearhead_Kevin

01-25-2004, 11:36 PM	#2
hobby67stepside Registered User Join Date: Dec 2001 Location: NW Iowa Posts: 952	I'd like to help, but for my BB installation I bought the BB towers and GM engine mounts. There is a 1/2" bolt that goes thru the tower into the GM engine mount. The way I did it was not cheap. The BB towers were $100 for the pair and the mounts were $200/pr and I understand they are considerably higher now. I think I know the configuration of what you are doing, but can't help with specifics. Sorry.

01-26-2004, 01:04 AM	#3
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	byrd, you able to get pics? It sounds like you may have towers and mounts that are not of the same year.

01-27-2004, 01:40 AM	#4
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	Can anyone show pics of the big block mounts from the variouse years? I was hoping my responce would prompt a responce from some one who knows big blocks.

01-27-2004, 04:24 AM	#8
Orence1 Registered User Join Date: Jan 2000 Location: Bothell, WA Posts: 548	I just converted my 72 from SB to BB. I used the 72 towers. I will try to get some pictures tomorrow and post them. Larry

01-27-2004, 12:00 PM	#10
Tx Firefighter Watch out for your cornhole ! Join Date: Jun 2003 Location: Azle, Texas Posts: 14,162	__________________ I'm on the Instagram- @Gearhead_Kevin

01-27-2004, 01:11 PM	#11
Bram Broke Join Date: Aug 2001 Location: West Plains,MO Posts: 385	byrd32, I have a set of 72 Big Block towers with new Big Block motor mounts on them for sale, $300.00 + shipping. Let me know if you want them. __________________ 72CheyenneSuper1ton4x4BigBlock

01-27-2004, 08:55 PM	#12
TxGary Registered User Join Date: Jul 2001 Location: Bowie, Texas 76230 Posts: 1,056	Here is a picture of the 72 big block frame mounts. Attached Images __________________ 71 C-10 SWB 1969 C-30 Custom Camper Motorhome Restoration in progress. 2020 Chevy 2500 Crew 4x4 LTZ Diesel 2024 Chevy Tahoe Z71 4X4 2015 Diamond C 22' HD car hauler Bowie, Texas 76230

01-27-2004, 09:28 PM	#13
Primered_69 Registered User Join Date: Sep 2002 Location: Fort Worth Posts: 1,409	What is the difference between those and ones in 73 up big block truck mounts? Is it just a matter or originality. Withh the other ones bolt up to our crossmembers? __________________ 1969 Chevy LWB - with shaved handles; 3 1/2 front/ 5 1/2 rear drop; (waiting to be put back together)

01-28-2004, 12:42 AM	#14
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	The 73 and up are a little different. Attached Images

01-28-2004, 12:43 AM	#15
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	ANd this one you can see the lower portion too...ignore the cut off corner, I had to do that with the caddy swap. Attached Images



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01-28-2004, 11:15 AM	#16
Bram Broke Join Date: Aug 2001 Location: West Plains,MO Posts: 385	byrd32, here are some pic's of the 72 Big Block towers with the motor mounts. __________________ 72CheyenneSuper1ton4x4BigBlock

01-28-2004, 10:00 PM	#17
byrd32 Registered User Join Date: Jan 2004 Location: richmond, va Posts: 7	I just want to thank everyone for responding to my thread out here... You guys are awesome. The camaraderie and esprit de corps of the people that visit this site (new members and regulars) and that have been helping me is far above and beyond what any dealership would ever be or become. You guys are all like second family... If I can ever be of assistance to anyone mail me. I finally am informed and know what I need for my project. Thanks a million to every one. Eric Byrd

02-02-2004, 07:42 AM	#18
Javy Account Suspended Join Date: Jan 2004 Posts: 129	byrd32 Which mounts did you decide to use ?

04-12-2004, 08:43 PM	#19
BigDaddyCMU Registered User Join Date: Oct 2002 Location: Memphis, MI Posts: 136	As far as I know, the motor mounts for those 70 bb towers are around $60 each, and I didn't think they were available at regular old parts stores. That's the toss up between the two. The 68-71 towers are cheap, but the mounts are expensive. The 72 towers are expensive, but the mounts are cheap.

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