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07-30-2008, 07:21 PM
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#1 |
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6>8 Plugless........
 
Join Date: Sep 2007
Location: Prairie City, Ia
Posts: 17,139
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SB BB differences in firewalls
A while back I put a BBC in my 70 K20. I had to move the engine forward an inch or so because the 4wd's engine's sat so far back. During this project a friend of mine told me that the 2wd big block trucks have a different firewall. Is this true? I looked at my longhorn truck that had a 402 in it and it looks the same as this rusted out sbc cab I have. Has any one else heard this before? Thanks Ryan.
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07-30-2008, 07:32 PM
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#2 |
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Junior Member
Join Date: Jul 2007
Location: Odenton, Md
Posts: 552
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Re: SB BB differences in firewalls
I think I read something about 4X4 bigblock being diff somehow. (not the body...but the fitment)
__________________
going to sell this one...looking for a SWB project next. |
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07-30-2008, 07:35 PM
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#3 |
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6>8 Plugless........
Join Date: Sep 2007
Location: Prairie City, Ia
Posts: 17,139
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Re: SB BB differences in firewalls
I know they never made a K20 with a big block from the factory, well I am pretty sure. But I am unsure of the firewall between the SBC trucks and the BBC trucks.
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07-30-2008, 07:47 PM
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#4 |
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Senior Member
Join Date: Aug 2003
Location: Lubbock, Texas
Posts: 2,443
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Re: SB BB differences in firewalls
No differences in the firewall itself!!
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72 Cheyenne Super 80 Silverado Blazer 2wd |
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07-30-2008, 07:49 PM
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#5 |
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Senior Member
Join Date: Jul 2001
Location: Muskegon,MI,USA
Posts: 6,026
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Re: SB BB differences in firewalls
Big blocks were not installed in 67-72 4x4 trucks. The fire walls are the same for the SBC and BBC 2 wd trucks except for the lower part on the right hand side. There is a heat shield fastened to the lower right hand side at the exhaust manifold location.
Jim
__________________
1971 Shortbox step side 4x4, 350 sbc, 3:07 rear end 1965 Impala SS 400 sbc, Muncie rock crusher 1966 Impala SS 396 bbc, TH 400 1969 El Camino, 350 sbc, TH 350 1971 Snowplow built on a Blazer frame 1972 GMC Short bed, stepside, TH 400, 427 BBC |
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07-30-2008, 08:05 PM
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#6 |
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6>8 Plugless........
Join Date: Sep 2007
Location: Prairie City, Ia
Posts: 17,139
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Re: SB BB differences in firewalls
Thanks Jim. I don't want to be misleading telling people that there is a BB cab. LOL
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07-30-2008, 08:16 PM
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#7 | |
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Junior Member
Join Date: Jul 2007
Location: Odenton, Md
Posts: 552
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Re: SB BB differences in firewalls
Quote:
Where can I get a Big Block cab at? I will pay big $$ for one! LOL 
__________________
going to sell this one...looking for a SWB project next. |
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07-30-2008, 08:23 PM
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#8 | |
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6>8 Plugless........
Join Date: Sep 2007
Location: Prairie City, Ia
Posts: 17,139
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Re: SB BB differences in firewalls
Quote:
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