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#1 |
Registered User
Join Date: Mar 2008
Location: Danville, VA
Posts: 122
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Switch to a Big Block
Can you put a big block in a truck with a low hump cab or do i need to change to a high hump? What other changes or problems would i run into?
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#2 |
State of Confusion!
![]() ![]() Join Date: Jul 2002
Location: Gulfport, MS USA
Posts: 46,923
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Re: Switch to a Big Block
It is probably better that you do put in a high hump, but I do not thing it is mandatory. I thought some one said some came with low hump, but I cannot remember for positive.
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Bill 1970 Chevy Custom/10 LWB Fleetside 2010 Toyota Tacoma PreRunner SR5 Double Cab - DD Member of Louisiana Classic Truck Club (LCTC) Bill's Gallery Life isn't tied with a bow, but it's still a gift. Live simply. Love generously. Care deeply. Speak kindly. Leave the rest to God! |
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#3 |
Registered User
Join Date: Sep 2001
Location: Hacienda Heights, California USA
Posts: 474
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Re: Switch to a Big Block
High humps were 4X4, 4 speed, or Turbo 400s.
You can put a big block in a low hump, the engine does not come in contact with the cab. The humps were for clearance due to the trannys. If your tranny hits the hump, you can always cut and modify your cab.
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'72 GMC custom camper 350/350 |
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#4 |
Registered User
Join Date: Mar 2008
Location: Danville, VA
Posts: 122
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Re: Switch to a Big Block
i am going to use a 700r4. will that make a difference?
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#5 |
Between Trucks...
Join Date: Mar 2002
Location: Los Angeles, CA.
Posts: 3,830
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Re: Switch to a Big Block
Just to clarify, I have a TH400 in my '69 with a low hump.
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Beat it to fit, Paint it to match... ![]() |
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#6 |
Registered User
Join Date: Mar 2008
Location: Sarasota, Fl.
Posts: 441
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Re: Switch to a Big Block
I've got a big block and 700r4 with a low hump floor. It fits great. Some people have said that it will hit, but i think thats because of cab mounts being worn out. As long as you have good mounts for everything, it should go in no problem. The only trouble I had was getting the motor and tranny in the right place. At first, my mounts were to far forward, so I had to move my mounts back a little. I did use all factory holes for mounting, so it shouldn't be a big deal.
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#7 |
Senior Member
![]() Join Date: Jan 2002
Location: Williston, ND
Posts: 2,999
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Re: Switch to a Big Block
We had a 402/400 in a 72 sb. The only thing I recommend is to put new cab mounts on(doesn't hurt anyways to change) except it might misalign the panels, so it might turn into a larger project than thought. i'm not sure on the dimensions of a 700r4, but isn't it the same size as a th350? if it is, it should work out no problem.
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68 Chevy CST/10, 50th Anniversary, 327/th400, 373 posi, buckets 68 GMC Shortbox Stepside, 402/th400, Tilt, Tach, Bucket Seats, 3.08 Positraction 69 Chevy Camaro SS, 383, 4 speed, positraction 70 Chevy El Camino SS396, Triple Black, 454/th400, Tach 70 Chevy Shortbox Stepside 4x4, 350/th350, Tilt, Tach, Cab Lights, Bumper Guards, Tow Hooks 70 Chevy 3/4 Longbox, 350/auto, 70k, SURVIVOR 71 Chevy Blazer, CST, 350/auto 71 GMC Sierra K2500, 454, 4 speed, 4.10 posi, 37s 71 Custom/30, Open Road, 350/th400, tilt 72 Chevy Shortbox Fleetside, 496 Stroker/th400, Tilt, Tach, Bucket Seats, 3.42 Posi 72 GMC Sierra Grande 2500. 427/th400, tilt, a/c, tool and stowage, buckets/console, 3.54 posi |
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#8 |
its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
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Re: Switch to a Big Block
where did the misconseption come from that says TH400 trucks had a high hump? I see it posted on here all the time.
High hump floors came in 4x4 trucks, 4 speed trucks, and big blocks with TH400. A handfull of oddballs came out with the wrong floors, I have a 305 V-6/TH400 with a high hump, and there's beena couple bb/th400's documented on here with a low hump. If you have good cab mounts, you should be fine. |
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#9 |
Account Suspended
![]() Join Date: Oct 2002
Location: NC
Posts: 1,129
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Re: Switch to a Big Block
Longhornman has hit the nail on the head
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#10 | |
Registered User
Join Date: Sep 2001
Location: Hacienda Heights, California USA
Posts: 474
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Re: Switch to a Big Block
Quote:
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'72 GMC custom camper 350/350 Last edited by spinning wheels; 02-22-2009 at 01:53 AM. |
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