4x4 big block?? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

3/4 GMC · 09-09-2015, 08:55 PM

Hello, I am new to the site. I am building from ground up a 1972 3/4 ton 4x4. As of date every thing under the truck has been powder coated, including the bottom of the bed pan and cab. We even went as far as to powder coat the fire wall inside and out. I am wanting to build this as a big block. Do you think this will hurt the end result or help it. Any thoughts?

cleszkie · 09-09-2015, 09:03 PM

If you go with a bib block, I think you will need to make some modifications to your firewall that you already powdercoated, in order to make it fit. There are a few old threads out there on the process of fitting a big block into a 4x4. Do a search and see what you find.

GASoline71 · 09-09-2015, 09:41 PM

How can an engine "hurt the end result"? Not sure I understand the question... It's your truck. Build it as you see fit.

Gary

**special-K** · 09-09-2015, 09:55 PM

The engine won't hurt the value any more than all that powder coating.But it's true, the firewall requires modification to fit a big block

**jocko** · 09-09-2015, 10:05 PM

agree with Tim - if concerned about originality because K's never came with big blocks from the factory, the pc negates all that. You've already kissed her, ya might was well marry her. Big Block!

**geunther** · 09-09-2015, 11:31 PM

I had a 72 Blazer and was able to install a BB without any firewall modifications. It was very tight and if I remember correctly I had to use stock valve covers in order to clear. Aluminum covers would not clear so thats how tight it was.

englands 71 · 09-09-2015, 11:33 PM

Quote:

Originally Posted by special-K

The engine won't hurt the value any more than all that powder coating.But it's true, the firewall requires modification to fit a big block

PeterHall · 09-10-2015, 02:00 AM

We're using a 4l80e and adapter to a np205. this combo pushed the engine forward enough for plenty of clearence on the cab.

72again4x4 · 09-10-2015, 03:56 AM

Hi 3/4GMC,
I'm with PeterHall, I have a 72 K10, BB396 and there is no firewall clearance issues. The HEI isn't going anywhere without pulling the motor though.
Good luck, sounds like a great project.
Roger

3/4 GMC · 09-10-2015, 09:47 AM

Not to sound stupid but I am, what is 4180E and adapter to a np205 is that the motor mount?

3/4 GMC · 09-10-2015, 10:10 AM

Quote:

Originally Posted by 72again4x4

Hi 3/4GMC,
I'm with PeterHall, I have a 72 K10, BB396 and there is no firewall clearance issues. The HEI isn't going anywhere without pulling the motor though.
Good luck, sounds like a great project.
Roger

May I ask what motor mounts you used? And Thanks its been fun so far

57taskforce · 09-10-2015, 10:37 AM

The 4l80e is the overdrive version of the turbo 400 transmission and it requires an adapter to mate to the original np 205 transfer case in your truck.

72again4x4 · 09-10-2015, 05:42 PM

3/4GMC, I can get some crappy cell phone pics of both mounts and the cab clearance if you like. The PO put the motor in and did a great job. I don't know exactly what mounts they are, sorry no help.
Shoot me a pm with email address and I'll send better pics if you like.
Roger

09-09-2015, 08:55 PM	#1
3/4 GMC Registered User Join Date: Feb 2015 Location: Coweta Posts: 3	4x4 big block?? Hello, I am new to the site. I am building from ground up a 1972 3/4 ton 4x4. As of date every thing under the truck has been powder coated, including the bottom of the bed pan and cab. We even went as far as to powder coat the fire wall inside and out. I am wanting to build this as a big block. Do you think this will hurt the end result or help it. Any thoughts?

09-09-2015, 09:03 PM	#2
cleszkie Registered User Join Date: Feb 2003 Location: Santa Ana, CA Posts: 2,191	Re: 4x4 big block?? If you go with a bib block, I think you will need to make some modifications to your firewall that you already powdercoated, in order to make it fit. There are a few old threads out there on the process of fitting a big block into a 4x4. Do a search and see what you find.

09-09-2015, 09:55 PM	#4
special-K Special Order Join Date: Nov 2004 Location: Mt Airy, MD Posts: 85,852	Re: 4x4 big block?? The engine won't hurt the value any more than all that powder coating.But it's true, the firewall requires modification to fit a big block __________________ "BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~

09-09-2015, 10:05 PM	#5
jocko Senior Member Join Date: Oct 2009 Location: Godley, TX Posts: 17,976	Re: 4x4 big block?? agree with Tim - if concerned about originality because K's never came with big blocks from the factory, the pc negates all that. You've already kissed her, ya might was well marry her. Big Block!

09-09-2015, 11:31 PM	#6
geunther Senior Member Join Date: Apr 2005 Location: Cheyenne, WY Posts: 740	Re: 4x4 big block?? I had a 72 Blazer and was able to install a BB without any firewall modifications. It was very tight and if I remember correctly I had to use stock valve covers in order to clear. Aluminum covers would not clear so thats how tight it was. __________________ The lid is stuck on my jar of anti seize

09-10-2015, 02:00 AM	#8
PeterHall Registered User Join Date: Apr 2015 Location: Pacific Palisades CA Posts: 98	Re: 4x4 big block?? We're using a 4l80e and adapter to a np205. this combo pushed the engine forward enough for plenty of clearence on the cab.

09-10-2015, 03:56 AM	#9
72again4x4 Registered User Join Date: Dec 2014 Location: Loveland, CO Posts: 179	Re: 4x4 big block?? Hi 3/4GMC, I'm with PeterHall, I have a 72 K10, BB396 and there is no firewall clearance issues. The HEI isn't going anywhere without pulling the motor though. Good luck, sounds like a great project. Roger __________________ 1971 K10 short bed step side, 5.3/th350/205, 3.73 gears

09-10-2015, 09:47 AM	#10
3/4 GMC Registered User Join Date: Feb 2015 Location: Coweta Posts: 3	Re: 4x4 big block?? Not to sound stupid but I am, what is 4180E and adapter to a np205 is that the motor mount? Last edited by 3/4 GMC; 09-10-2015 at 10:08 AM. Reason: Need to add quote.

09-10-2015, 10:37 AM	#12
57taskforce All about them K’s Join Date: Jun 2014 Location: Land of Entrapment Posts: 6,445	Re: 4x4 big block?? The 4l80e is the overdrive version of the turbo 400 transmission and it requires an adapter to mate to the original np 205 transfer case in your truck. __________________ Tyler '57 3100 http://67-72chevytrucks.com/vboard/s...d.php?t=813888 '72 K20 Cheyenne: 5” lift, 35’s, front dana 60 blah blah blah… http://67-72chevytrucks.com/vboard/s...d.php?t=662879 ‘69 K10 SWB: 4” lift 33”s… in a million pieces http://67-72chevytrucks.com/vboard/s...d.php?t=805206 '98 Silverado LT K2500HD ECLB Vortec 454/4l80E: 6" lift 35x12.5x20’s

09-10-2015, 05:42 PM	#13
72again4x4 Registered User Join Date: Dec 2014 Location: Loveland, CO Posts: 179	Re: 4x4 big block?? 3/4GMC, I can get some crappy cell phone pics of both mounts and the cab clearance if you like. The PO put the motor in and did a great job. I don't know exactly what mounts they are, sorry no help. Shoot me a pm with email address and I'll send better pics if you like. Roger __________________ 1971 K10 short bed step side, 5.3/th350/205, 3.73 gears

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