Quick Question - 4x4 With Big Block - The 1947 - Present Chevrolet & GMC Truck Message Board Network

PETEM1957 · 06-01-2005, 02:46 PM

Was A Big Block Ever Offered In The 4 X 4 Version Of 67 To 72 Trucks With Automatic Or Manual Transmissions? All References I've Seen Are Two Wheel Drive Only. I Had A 1969 Lwb Two Wheel Drive That My Cousin Now Has. I Now Have A 1970 3/4 Ton Lwb M/t With A Semi Tired 350 In It. I Have A Fresh 396 That I Would Like To Install In It. But All References In Parts Books,say For Header Applications Exclude The Big Block In 4 X4 Applications Especially With A Manual Tranmission. Anyone With A Way Around This Issue??

meathead95 · 06-01-2005, 03:52 PM

bbc was never offered in a 4x4 try sending yukon jack a pm he just put a bbc in his 4x4 with headers and a 4 spd

*bisquik65* · 06-01-2005, 04:48 PM

Quote:

Originally Posted by PETEM1957

Was A Big Block Ever Offered In The 4 X 4 Version Of 67 To 72 Trucks With Automatic Or Manual Transmissions? All References I've Seen Are Two Wheel Drive Only. I Had A 1969 Lwb Two Wheel Drive That My Cousin Now Has. I Now Have A 1970 3/4 Ton Lwb M/t With A Semi Tired 350 In It. I Have A Fresh 396 That I Would Like To Install In It. But All References In Parts Books,say For Header Applications Exclude The Big Block In 4 X4 Applications Especially With A Manual Tranmission. Anyone With A Way Around This Issue??

You can use a BB in with amanual trans and headers,You just need to read the footnotes under the header # Thats where i found out,You need 73-85 non hydralic clutch linkage,you will need the rod from the pedal to the z-bar...the z-bar itslef,and the frame bracket...and you need to cut a hole in the cab lower that you orignal one by about 3 inches...Thats all,rest is a botl in, You may have to Dimple the friewall on the pass side for valve cover clearance... I have done this swap before

took the truck apart and put the LS6 454 in my 65 Biscayne...

**402Bowtie** · 06-01-2005, 07:20 PM

Good question....What needs to be done to have a BB with an automatic trans?

Roberty · 06-01-2005, 09:00 PM

I'd venture a guess that an automatic swap would be easier. I have a friend who used to have a '69 4x4 with a 396 and automatic. Just be sure to use the big block motor and frame mounts.

MAC67 · 06-01-2005, 09:20 PM

all of the ones i have owned or built i put big blocks in , you dont need to use big block motor mounts or towers or frame crossmember ect , if its just going to be a fun cruiser depending on the size of your valve covers you will need to put to small dents in the fire wall , maybe the size of a golfball for valve cover clearance only , if you are running a body lift it is easier , or you can move your mounts an inch or 2 forward and elimnate the need for altering the firewall

**BAD4X4** · 06-01-2005, 11:40 PM

I used Hooker super comps on my 70 chev 4x4 4-speed. The part # is 2817 and -1 for ceramic coating. Mine fit Killer. This is like the 4th set of hookers like this I have used. Hope this helps.

**Yukon Jack** · 06-02-2005, 12:10 PM

Here the link linky to the headache I had on fitting my bb. You will find some people that have to do not firewall mods at all, some that do a little and others that have big problems. I still don't understand why it varies.

shane0331 · 12-16-2024, 08:24 PM

Hey Yukon Jack,

Thinking about taking on this headache. Would love to go back and review your experience. Seems the linky no longer works. Any chance you could re-post it? Thanks a bunch!

**dennislbrooks** · 12-19-2024, 11:08 AM

I think I read that the first BBC in a chevy 4x4 pickup was in 1977 but in 1 ton trucks.

I moved the motor mount perch forward 1 inch when I put my 402 BBC in my 67. Has a 700R4 with a NP208.

I like the motor mounts/clamshells/perches from a BBC 2wd square body. There will be some issues to resolve. Like Yukon Jack, I raised the engine 1/2 inch on mounts. You will be playing with other clearances. I did not have to modify the firewall and I run a Hydro boost.

https://www.67-72chevytrucks.com/vbo...d.php?t=615038

**Yukon Jack** · 12-19-2024, 01:55 PM

I don't have an active website but I was able to get the page to load on my computer and at least take screenshots.

**Yukon Jack** · 12-19-2024, 01:57 PM

Here are the photos

**Yukon Jack** · 12-19-2024, 01:59 PM

Last pic.

06-01-2005, 02:46 PM	#1
PETEM1957 Junior Member Join Date: Mar 2005 Location: Albuquerque, NM Posts: 275	Quick Question - 4x4 With Big Block Was A Big Block Ever Offered In The 4 X 4 Version Of 67 To 72 Trucks With Automatic Or Manual Transmissions? All References I've Seen Are Two Wheel Drive Only. I Had A 1969 Lwb Two Wheel Drive That My Cousin Now Has. I Now Have A 1970 3/4 Ton Lwb M/t With A Semi Tired 350 In It. I Have A Fresh 396 That I Would Like To Install In It. But All References In Parts Books,say For Header Applications Exclude The Big Block In 4 X4 Applications Especially With A Manual Tranmission. Anyone With A Way Around This Issue??

06-01-2005, 03:52 PM	#2
meathead95 computer illiterate Join Date: Jan 2001 Location: Des Moines, IA Posts: 6,440	bbc was never offered in a 4x4 try sending yukon jack a pm he just put a bbc in his 4x4 with headers and a 4 spd __________________ 72 2wd blazer 72 swb 4x4

06-01-2005, 07:20 PM	#4
402Bowtie Registered User Join Date: Sep 2003 Location: Wichita, KS Posts: 3,735	Good question....What needs to be done to have a BB with an automatic trans? Last edited by 402Bowtie; 06-01-2005 at 07:21 PM.

06-01-2005, 09:00 PM	#5
Roberty Hot Damn - Here I Am!! Join Date: Feb 2000 Location: Ringgold, Georgia Posts: 726	I'd venture a guess that an automatic swap would be easier. I have a friend who used to have a '69 4x4 with a 396 and automatic. Just be sure to use the big block motor and frame mounts. __________________ My vehicles: '90 Silverado Sport '71 Chevelle SS Convertible '70 C-10 - My Grandfather bought it new - original un-restored

06-01-2005, 11:40 PM	#7
BAD4X4 Senior Member Join Date: Jan 2003 Location: La pine Oregon Posts: 1,668	I used Hooker super comps on my 70 chev 4x4 4-speed. The part # is 2817 and -1 for ceramic coating. Mine fit Killer. This is like the 4th set of hookers like this I have used. Hope this helps. __________________ 1972 Cheyenne K-30 6"lift {502 PROJECT} 1972 Cheyenne K-30 8"lift 454 450hp {Ol'Blue} 1972 Cheyenne K-20 Custom Stretch 6" lift 454 1972 Custom Deluxe K-20 4" lift 2007 GMC Crew Cab Diesel 6"lift {The Tow Rig 2017 Ford F-350 Crew Cab 6.7 6"lift (Wife's) 1977 El Camino SS Grandpa baught new 1986 K-30 Crew Cab 502 1955 Chevy 2-Door gasser 454 550hp{project} 1956 Chevy Bel-Air 2-Door hardtop 572 700hp 1979 Ford F-350 All Original 4x4 (Wife's)

06-01-2005, 09:20 PM	#6
MAC67 " SHOW ME" Join Date: Jan 2003 Location: shelbyville illinois Posts: 2,624	all of the ones i have owned or built i put big blocks in , you dont need to use big block motor mounts or towers or frame crossmember ect , if its just going to be a fun cruiser depending on the size of your valve covers you will need to put to small dents in the fire wall , maybe the size of a golfball for valve cover clearance only , if you are running a body lift it is easier , or you can move your mounts an inch or 2 forward and elimnate the need for altering the firewall

06-02-2005, 12:10 PM	#8
Yukon Jack Post Whore Join Date: Feb 2000 Location: Rose Hill, KS, USA Posts: 12,686	Here the link linky to the headache I had on fitting my bb. You will find some people that have to do not firewall mods at all, some that do a little and others that have big problems. I still don't understand why it varies. __________________ 1970 Blazer with a 400 sbc and 4" lift 1980 Pontiac Trans Am, 455 Oldsmobile 2012 Kawasaki Concours 14

12-16-2024, 08:24 PM	#9
shane0331 Registered User Join Date: Oct 2011 Location: Appleton, Wi Posts: 22	Re: Quick Question - 4x4 With Big Block Hey Yukon Jack, Thinking about taking on this headache. Would love to go back and review your experience. Seems the linky no longer works. Any chance you could re-post it? Thanks a bunch!

12-19-2024, 11:08 AM	#10
dennislbrooks Senior Member Join Date: Feb 2004 Location: Williamsburg, Ohio Posts: 1,798	Re: Quick Question - 4x4 With Big Block I think I read that the first BBC in a chevy 4x4 pickup was in 1977 but in 1 ton trucks. I moved the motor mount perch forward 1 inch when I put my 402 BBC in my 67. Has a 700R4 with a NP208. I like the motor mounts/clamshells/perches from a BBC 2wd square body. There will be some issues to resolve. Like Yukon Jack, I raised the engine 1/2 inch on mounts. You will be playing with other clearances. I did not have to modify the firewall and I run a Hydro boost. https://www.67-72chevytrucks.com/vbo...d.php?t=615038 Attached Images __________________ 1942 Chevy 1/2 ton Rod, 1959 GMC 1/2 ton Fleet Stepside, 1967 Chevy SWB K10, 1985 Corvette Coupe 4+3, 2015 Chevy Duramax reg cab 4WD W/T Last edited by dennislbrooks; 12-19-2024 at 06:02 PM. Reason: pic

12-19-2024, 01:55 PM	#11
Yukon Jack Post Whore Join Date: Feb 2000 Location: Rose Hill, KS, USA Posts: 12,686	Re: Quick Question - 4x4 With Big Block I don't have an active website but I was able to get the page to load on my computer and at least take screenshots. Attached Images __________________ 1970 Blazer with a 400 sbc and 4" lift 1980 Pontiac Trans Am, 455 Oldsmobile 2012 Kawasaki Concours 14

12-19-2024, 01:57 PM	#12
Yukon Jack Post Whore Join Date: Feb 2000 Location: Rose Hill, KS, USA Posts: 12,686	Re: Quick Question - 4x4 With Big Block Here are the photos Attached Images __________________ 1970 Blazer with a 400 sbc and 4" lift 1980 Pontiac Trans Am, 455 Oldsmobile 2012 Kawasaki Concours 14

12-19-2024, 01:59 PM	#13
Yukon Jack Post Whore Join Date: Feb 2000 Location: Rose Hill, KS, USA Posts: 12,686	Re: Quick Question - 4x4 With Big Block Last pic. Attached Images __________________ 1970 Blazer with a 400 sbc and 4" lift 1980 Pontiac Trans Am, 455 Oldsmobile 2012 Kawasaki Concours 14

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