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09-26-2014, 09:31 PM
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#1 |
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Senior Member
  
Join Date: Jan 2002
Location: Burghill, Ohio 44404
Posts: 3,402
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BB block in 4X4
How fare do you have to move the engine forward to make a BB look stock in a 4x4 blazer and how many problems will I get into.
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  1972 GMC Jimmy 1/2 4X4 4wheel camper 1970 GMC Jimmy 1/2 4X4 350 1969 Chevy Blazer 1/2 4X4 307 1967 chevy LWB 3/4 396 |
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09-26-2014, 09:37 PM
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#2 |
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Senior Member
Join Date: Nov 2003
Location: Brookings, SD
Posts: 10,497
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Re: BB block in 4X4
The reason the small block is so far back in the 4x4's is for front differential clearance. This is going to be compounded by installing a big block, so I am not sure moving it forward is the best answer.
Do you plan to run a lift? I would think that would help.
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Some people are like slinkies, they aren't good for anything, but you can't help but smile when you see one tumble down the stairs. |
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09-26-2014, 10:02 PM
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#3 |
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Registered User
Join Date: May 2007
Location: Rapid City South Dakota
Posts: 2,359
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Re: BB block in 4X4
It ends up being about 2 1/2". Without a lift, it may not work.
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Turp Mcspray New life for an old 2wd, farm blazer http://67-72chevytrucks.com/vboard/s...d.php?t=505987 My Blazer build http://67-72chevytrucks.com/vboard/s...d.php?t=342299 |
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09-27-2014, 09:03 AM
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#4 |
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Vintage 4x4s
Join Date: Sep 2010
Location: Prior Lake, MN
Posts: 4,305
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Re: BB block in 4X4
Send Toomuchstuff a message, he has a BBC 4x4
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67 GMC K1500 Custom- 305V6 SM420, PTO, Ram Assist, yellow (the outcast) (project period correct upgrades) 67 GMC C2500 351V6 TH400, AC, PS, PB (can't decide what to do with. Update, decided to keep and will restore  )86 CHV K30 502 th400, apple red NEW 71 CHV K20 350 SM465, ochre (saved work truck) 71 CHV K20 292 SM465, white, tach, PTO, (future project) 72 CHV K20 350 350th, medium blue (project stocker) 01 CHV K2500hd crew, indigo blue ^3 dont run and the others don't see winter either '86 K30 Cummins "Fireside" thread: http://67-72chevytrucks.com/vboard/s...d.php?t=649649 '71 K20 "get driveable" thread: http://67-72chevytrucks.com/vboard/s...d.php?t=590642 '72 K20 Build Thread: http://67-72chevytrucks.com/vboard/s...=493477&page=6 |
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09-27-2014, 12:11 PM
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#5 |
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Proprietor of Dale's Corner
Join Date: Nov 2012
Location: Vacaville , CA
Posts: 15,977
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Re: BB block in 4X4
When I got mine it had the big block. It' hasn't been moved forward at all. The drivers side valve cover is really tight..But I'm going to notch the fire wall a little before I go back together.
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"Some Days Chickens And Some Days Feathers" Dale XNGH ECV Sam Brannan 1004 R.I.P. 67ChevyRedneck R.I.P. Grumpy Old Man Last edited by Ol Blue K20; 09-29-2014 at 07:39 AM. |
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09-28-2014, 09:10 PM
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#6 |
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Senior Member
Join Date: Jan 2002
Location: Burghill, Ohio 44404
Posts: 3,402
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Re: BB block in 4X4
Not planing on lifting it is going to be a show truck might not ever use the the 4 wheel drive.
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1972 GMC Jimmy 1/2 4X4 4wheel camper 1970 GMC Jimmy 1/2 4X4 350 1969 Chevy Blazer 1/2 4X4 307 1967 chevy LWB 3/4 396 |
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09-28-2014, 09:45 PM
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#7 |
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Registered User
Join Date: Jan 2011
Location: Townsend MT
Posts: 1,725
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Re: BB block in 4X4
Look over in the 4X4 section. If the cab mounts are good and you run low valve covers, nothing has to be moved.
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09-29-2014, 07:31 AM
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#8 |
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Registered User
Join Date: Sep 2014
Location: Payson, UT
Posts: 53
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Re: BB block in 4X4
I've heard a body lift is the easiest answer to getting them to fit with the tight firewall clearances, it is what I will be doing when I install one in mine.
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1974 Plymouth Satellite (driver, project) 1972 GMC 2500 (future project, does drive though) |
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09-29-2014, 07:55 AM
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#9 |
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KEEP ON TRUCKIN'
Join Date: Jun 2005
Location: Sterling, Va.
Posts: 5,731
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Re: BB block in 4X4
My short bed had a big block in it when I bought it. The only thing they (whoever installed it) did was hammer on the firewall a bit to get the distributor to clear. There is a small profile HEI you could get to save room and not have to beat up the firewall. The BB was mounted in the same holes as the small block. I saw no other issues with mine when it was in there. My truck is in pieces now so I have no picks to show you, sorry.
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10-02-2014, 06:29 PM
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#10 |
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Senior Member
Join Date: Jan 2002
Location: Burghill, Ohio 44404
Posts: 3,402
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Re: BB block in 4X4
do you use the sb motor mounts or bb mounts
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1972 GMC Jimmy 1/2 4X4 4wheel camper 1970 GMC Jimmy 1/2 4X4 350 1969 Chevy Blazer 1/2 4X4 307 1967 chevy LWB 3/4 396 |
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