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#1 |
Registered User
Join Date: Feb 2013
Location: Chilliwack
Posts: 13
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BBC for my long box 67, what problems am I facing?
Hey guys
I've recently been considering putting a big block in my long box 67 GMC. The truck was originally equipped with a 283. What kind of problems am I going to face? Will I require a completely new cross member up front? With adding that much torque is there better pilot bearings because the stock set up seems a little weak to me.
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if it ain't loud you ain't proud |
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#2 |
Registered User
Join Date: Aug 2012
Location: Council Bluffs, Iowa
Posts: 280
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Re: BBC for my long box 67, what problems am I facing?
Your biggest hurdle is having to find 68-71 bbc engine mounts and stands. I run a fairly built 402 and my pilot bearing seems to be fine. You don't need a new cross member if you a 2wd truck. If its a 4x4 I think you would be opening a can of worms that will give you headaches for days on end. You''ll be fine as long as you have the correct motor mounts and stands.
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#3 |
Junior Member
Join Date: Dec 2006
Location: Southeast Missouri
Posts: 2,436
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Re: BBC for my long box 67, what problems am I facing?
When we put a '74 454 in my '67 that has a '68 -'72 frame we used the stands and motor mounts that were in the '74 truck. My truck has a Sm-465 tranny.
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'67 Chevy C-20 short stepper - build complete, 454/SM-465. '75 C-30 Single Cab DRW-350 small block/NP-435. '77 GMC-6500 Dump Truck, 427 Tall Deck. '92 GMC K-3500 Duallie, 454/4L80E. |
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#4 |
Registered User
Join Date: Aug 2006
Location: Redmond, WA
Posts: 6,332
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Re: BBC for my long box 67, what problems am I facing?
Engine stands. And depending on the year, mounts. The '70 mounts for example are not available at autoparts stores and run you $200 or more for repops with the wrong bolts (grrr).
Generally the toughest part is all the accessories, mounts, brackets, and so on. Much easier if you've got a donor vehicle that has all of that to start with. Starting with just a motor would be no fun. Been there, done that, wouldn't do it again.
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1970 GMC Sierra Grande Custom Camper - Built, not Bought 1969 Pontiac 2+2 427/390 4-speed Coupe 1969 Pontiac 2+2 427/390 4-speed Convertible |
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#5 |
Registered User
Join Date: Feb 2013
Location: Chilliwack
Posts: 13
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Re: BBC for my long box 67, what problems am I facing?
Thanks for the replies guys. Clearly my biggest problem is stands and mounts. What about clearances for headers? I already have a pretty snug fit with long tubes on my small block. Would it just be as simple as switching to shorties?
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if it ain't loud you ain't proud |
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#6 |
Senior Moment
![]() Join Date: Mar 2002
Location: Pittsburg Ca
Posts: 4,138
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Re: BBC for my long box 67, what problems am I facing?
I used the 72 mounts in my 70 and have long tube headers that fit perfect with no issues. I'm trying to remember who made them (sorry bout that) I know I bought them from Jegs and they are 1 3/4 primary tube, being small may be why they fit so good!!
When I did my swap I started with just a 454 and started accumulating parts slowly until I had what I needed. I bought all the accessory parts from guy’s right here. Keep an eye on the parts board there are some good deals if you wait and watch. Good Luck with your build
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1970 CST LS 1 6 speed Ford 9 inch Detroit Tru Track, Dakota Didgital, Vintage Air, QA1 Coil Overs Front & Rear Lots of FUN 2013 GMC PU, Oldest Son 71 GMC LWB. QA1 Suspension, Angry SB. Youngest Son 2019 GMC Diesil Dually. Youngest Son 2017 Toyota SUV Daughters car 2018 Traverse , Wife’s Ride Pittsburg Ca 94565 |
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#7 |
Registered User
![]() Join Date: Dec 2013
Location: Oakland, CA
Posts: 61
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Re: BBC for my long box 67, what problems am I facing?
You may run into header clearance issues, as in '67 the frame by the engine was wider. In '68 when they offered the big blocks, they cut a clearance into the frame, so I imagine you'll have to do something similar. I discovered this the hard way in my '67
http://67-72chevytrucks.com/vboard/s...24#post6421024 |
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#8 |
Registered User
Join Date: Nov 2012
Location: rosharon, Texas
Posts: 29
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Re: BBC for my long box 67, what problems am I facing?
I bought these and put a 396 in my 72 with 1 7/8 tube headers and had no problem. Fit like a glove. But they aren't stock ...thats the only problem if you wanna stay original http://www.ebay.com/itm/1963-72-CHEV...c58bthat's the only problem
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#9 |
Registered User
Join Date: Oct 2012
Location: Arlington Washington
Posts: 1,808
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Re: BBC for my long box 67, what problems am I facing?
I cut my frame rails to match 68+ for the header/manifold clearance
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#10 | |
Account Suspended
Join Date: Jan 2007
Location: Tucson
Posts: 2,183
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Re: BBC for my long box 67, what problems am I facing?
Quote:
The correct BB engine stands are getting a bit scarce so be prepared to pay a bit. there are several vendors on this board the have them and they won't ask for your first-born to pay for them. |
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