Another BB swap question........ - The 1947 - Present Chevrolet & GMC Truck Message Board Network

bagged91 · 01-28-2004, 10:31 PM

I have a few issues I need to clear up in my head.... Here it goes:

I have purchased but haven't brought home yet a 71 C20 sub with a factory BB,T400,ect.....

My 71 C10 is a 307, 3spd....

The BB I am using for my C10 is the 454 out of my 76 CC dually.

I had planned on using the C20's mounts, brackets, ect and just swapping them into my C10 frame and dropping the 454 in but....

Do I understand correctly that the 68-71 BB rubbermounts are like $120+ ea!? Nobody makes a Urethane mount as a replacement???

Will the 76' frame mounts bolt onto the 71' C10 frame & crossmember without any mods???

Last but not least, I read in another thread that the BB/T400 trucks had a high hump floor. My C10 has the low hump. Will I need to swap humps from the donor C20 Sub or will I be OK with my clearance.

Thanks....
Joe

miket · 01-28-2004, 10:55 PM

no hump swapping required.

Tx Firefighter · 01-28-2004, 11:05 PM

I use small block rubber mounts on big block stands. They cost about 7 bucks each. Works fine for me. Mounts already cost too much 10 years ago when I had my first BB truck. I just use a big harmonic balancer bolt washer underneath the stand on the mount bolt.

Low hump will work, but if your cab mounts are real saggy, it will rub. New mounts will fix it.

bagged91 · 01-29-2004, 10:00 AM

You are using the 68-71 stands I assume???? I don't plan on rompin' all over this truck so they should hold up just fine I guess...

Good deal on the hump...

Thanks....
Joe

Ole Blue · 01-29-2004, 02:32 PM

I believe the later modle frame stands will work with some modification. If you donot want to drill the additional holes, I would be interested in buying the later model mounts. Thanks, Bart

01-28-2004, 10:31 PM	#1
bagged91 Out draggin' Join Date: Jan 2004 Location: Pitman,NJ Posts: 1,574	Another BB swap question........ I have a few issues I need to clear up in my head.... Here it goes: I have purchased but haven't brought home yet a 71 C20 sub with a factory BB,T400,ect..... My 71 C10 is a 307, 3spd.... The BB I am using for my C10 is the 454 out of my 76 CC dually. I had planned on using the C20's mounts, brackets, ect and just swapping them into my C10 frame and dropping the 454 in but.... Do I understand correctly that the 68-71 BB rubbermounts are like $120+ ea!? Nobody makes a Urethane mount as a replacement??? Will the 76' frame mounts bolt onto the 71' C10 frame & crossmember without any mods??? Last but not least, I read in another thread that the BB/T400 trucks had a high hump floor. My C10 has the low hump. Will I need to swap humps from the donor C20 Sub or will I be OK with my clearance. Thanks.... Joe __________________ 91 GMC Xcab LB-Bags/bd/caddy clip SOLD 72 C10 Cheyenne Super LWB SOLD 92 GMC K1500 Burb 72 C10 Burb (ex. Cheesewagon)SOLD 72 C20 Burb parts truck 71 C10 Burb "project"

01-28-2004, 10:55 PM	#2
miket Registered User Join Date: Jan 2003 Location: Seattle WA Posts: 1,466	no hump swapping required. __________________ FocuzTech Performance Evergreen Protective Coatings Gatorhyde...the best kept secret in spray in bed lining & protection

01-28-2004, 11:05 PM	#3
Tx Firefighter Watch out for your cornhole ! Join Date: Jun 2003 Location: Azle, Texas Posts: 14,162	I use small block rubber mounts on big block stands. They cost about 7 bucks each. Works fine for me. Mounts already cost too much 10 years ago when I had my first BB truck. I just use a big harmonic balancer bolt washer underneath the stand on the mount bolt. Low hump will work, but if your cab mounts are real saggy, it will rub. New mounts will fix it. __________________ I'm on the Instagram- @Gearhead_Kevin

01-29-2004, 10:00 AM	#4
bagged91 Out draggin' Join Date: Jan 2004 Location: Pitman,NJ Posts: 1,574	You are using the 68-71 stands I assume???? I don't plan on rompin' all over this truck so they should hold up just fine I guess... Good deal on the hump... Thanks.... Joe __________________ 91 GMC Xcab LB-Bags/bd/caddy clip SOLD 72 C10 Cheyenne Super LWB SOLD 92 GMC K1500 Burb 72 C10 Burb (ex. Cheesewagon)SOLD 72 C20 Burb parts truck 71 C10 Burb "project"

01-29-2004, 02:32 PM	#5
Ole Blue Registered User Join Date: Sep 2003 Location: Holts Summit, Mo. Posts: 58	I believe the later modle frame stands will work with some modification. If you donot want to drill the additional holes, I would be interested in buying the later model mounts. Thanks, Bart __________________ 72 Cheyenne Super waiting on 4/6 drop,BB and 700r4



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