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Author Topic: SBC to BBC swap  (Read 3634 times)

Offline Bigwayne

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SBC to BBC swap
« on: August 06, 2017, 07:11:16 pm »
New guy here, I can't seem to find anything on this in a search, I have a 86 GMC 2wd, I'm putting a 496 in it, need some help with motor mounts, some say the SB mounts will work or is there a BB mount I have to get, also does anyone know what headers will fit, and what radiator will work for the BB, and last, what about the water pump long or short thanks
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Offline Engineer

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Re: SBC to BBC swap
« Reply #1 on: August 07, 2017, 04:48:58 pm »
You want the 4 core radiatior. Standard equipment for the BB equipped trucks.

Hooker headers.

Long water pump. Brackets are way easier to find.

SB mounts will work but I had an issue with my HD 7 blade fan rubbing the lower side of the fan shroud on my 4x4. BB mounts are taller and centers the fan in the shroud opening.
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2002 Chevy 2500HD 4x4 8.1/ZF6sp RC/LB
2001 Chevy 2500HD 4x4 6.0/4L85E EC/SB
1997 Chevy Blazer 4x4
1994 Chevy K-2500 4x4 C6P 5.7/4L80E
1979 Chevy K-30 4x4 4sp 4.10
1977 Chevy K-30 4x4 4sp 4.10 454

Dad of an Eagle Scout, and a Life Scout

Offline Bigwayne

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Re: SBC to BBC swap
« Reply #2 on: August 09, 2017, 02:13:48 am »
Thanks, what year and size truck did they start putting BB in these trucks, I found all the brackets an pulleys at Alan grove components,
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Offline Engineer

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Re: SBC to BBC swap
« Reply #3 on: August 10, 2017, 08:12:27 pm »
The 454 I have in my monster truck is out of a '73 C-20.
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2002 Chevy 2500HD 4x4 8.1/ZF6sp RC/LB
2001 Chevy 2500HD 4x4 6.0/4L85E EC/SB
1997 Chevy Blazer 4x4
1994 Chevy K-2500 4x4 C6P 5.7/4L80E
1979 Chevy K-30 4x4 4sp 4.10
1977 Chevy K-30 4x4 4sp 4.10 454

Dad of an Eagle Scout, and a Life Scout

Offline Irish_Alley

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Re: SBC to BBC swap
« Reply #4 on: August 11, 2017, 07:39:33 am »
BB came in ½tons for certain years also
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If you can’t tell yourself the truth, who can you tell it to?~Irish_Alley

When you have eliminated the impossible, whatever remains, however improbable, must be the truth ~Sherlock Holmes

Offline Bigrig

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Re: SBC to BBC swap
« Reply #5 on: August 11, 2017, 10:41:38 am »
I am doing a similar swap except I went with a 455 Oldsmobile (torque monster) and am had header clearance issues and had to add a 1/2 spacer  for the motor mount which I fabricated to get the clearance , not a big deal
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