Big Block 4x4 motor mounts - The 1947 - Present Chevrolet & GMC Truck Message Board Network

71elect · 11-29-2003, 05:06 AM

I'm toying with the idea of swapping out my 250 six in my 72 4x4 in favor of either a 396 or 454 that I've got access to. What motor mounts would I need? Not sure what to use since the 4x4s didn't originaly come with a big block.
Thanks,
Josh

imdarren · 11-29-2003, 02:03 PM

Small block motor mounts is what you will need to use.
You move them forward one hole on the frame.
The motor mount on the right will move forward one hole ok.
The left motor mount will need a hole drilled in the frame for the forward hole while the mount has the rear mount hole in the existing forward hole in that side. Sounds confusing.

71elect · 11-29-2003, 04:40 PM

imdarren,
Nope... you didn't confuse me. Thanks for the info!

Josh

**Yukon Jack** · 12-01-2003, 06:20 PM

Here's what I did http://www.myoldtruck.com/modules.ph...&pid=12&page=2

Custom 68 · 12-01-2003, 07:46 PM

Thanks Jack very informative.

11-29-2003, 05:06 AM	#1
71elect Registered User Join Date: Nov 2002 Location: Southern Idaho Posts: 59	Big Block 4x4 motor mounts I'm toying with the idea of swapping out my 250 six in my 72 4x4 in favor of either a 396 or 454 that I've got access to. What motor mounts would I need? Not sure what to use since the 4x4s didn't originaly come with a big block. Thanks, Josh __________________ 72Chevy swb 4x4 71GMC swb 2x4

11-29-2003, 02:03 PM	#2
imdarren Registered User Join Date: Oct 2001 Location: SW Washington Posts: 1,006	Small block motor mounts is what you will need to use. You move them forward one hole on the frame. The motor mount on the right will move forward one hole ok. The left motor mount will need a hole drilled in the frame for the forward hole while the mount has the rear mount hole in the existing forward hole in that side. Sounds confusing. __________________ Washington State 1967 Chevy C10 LWB Rodstoration In Progress. 1972 K20 Cheyenne Super

11-29-2003, 04:40 PM	#3
71elect Registered User Join Date: Nov 2002 Location: Southern Idaho Posts: 59	imdarren, Nope... you didn't confuse me. Thanks for the info! Josh __________________ 72Chevy swb 4x4 71GMC swb 2x4

12-01-2003, 06:20 PM	#4
Yukon Jack Post Whore Join Date: Feb 2000 Location: Rose Hill, KS, USA Posts: 12,683	Here's what I did http://www.myoldtruck.com/modules.ph...&pid=12&page=2 __________________ 1970 Blazer with a 400 sbc and 4" lift 1980 Pontiac Trans Am, 455 Oldsmobile 2012 Kawasaki Concours 14

12-01-2003, 07:46 PM	#5
Custom 68 Registered User Join Date: Nov 2001 Location: Springfield, MO Posts: 2,928	Thanks Jack very informative. __________________ Dave 1968 Custom Chevy with turbo charged 5.3 gen III 4l80e swap 1967-71 GMC 3/4 ton long step 4x4 (not sure what year exactly?) "A good friend will bail you out of jail...but a true friend will be sitting next to you saying "that was frekin awesome". "If it doesn't fit force it...If it breaks then it needed to be replaced anyway!"



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