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#1 |
Account Suspended
Join Date: May 2004
Location: Simi Valley, CA
Posts: 1,387
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what's necessary to do a big block swap?
My buddy is sending a 89 chevy 2500 to the scrapper and it's got a 454 and turbo 400 trans that he's gonna give me for cheap. What's needed to get this swapped into my truck?
are the motor mounts the same or will they need to be changed? Any other problems I might run into? I'm trying to get everything together before the swap so it goes as seamlessly as possible. I'm already pricing out intake manifolds to swap out the TBI back to carb, and I'm looking for some headers as well. |
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#2 |
Moderator
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Location: Southern Cal
Posts: 20,006
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Re: what's necessary to do a big block swap?
I've got some BB headers and BB motor mounts if you decide to go that route...others will chime in with exactly what is needed, if anything else.
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1972 C/10 Cheyenne Super SWB. Restored, loaded, slammed. 1968 C/10 50th Anniversary LWB. Unrestored, stock, daily driver/work truck. RIP ElJay RIP 67ChevyRedneck RIP Grumpy Old Man |
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#3 |
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Join Date: May 2004
Location: Simi Valley, CA
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Re: what's necessary to do a big block swap?
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#4 |
Registered User
Join Date: Jan 2007
Location: pittsburg kansas
Posts: 894
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Re: what's necessary to do a big block swap?
when i was doing this swap in my 70gmc 2wd i was searching around also. everyone told me they were differnet motor perches. I measured 5 times and they seemed the same to me. So i put it in just to see. I have had no problems runnin my perches off my small block. for what its worth.
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#5 | |
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Join Date: Jan 2007
Location: Tucson
Posts: 2,183
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Re: what's necessary to do a big block swap?
Quote:
be sure to take the entire serpentine belt drive,idler and all of the bracketry power steering pump, A/C compressor, idler and pulleys. You didn’t say which motor you’re running now so I’ll assume a small block, which means you’ll need a larger Radiator. I doubt a fan & fan clutch from 67-72 is going to be compatible with the belt drive on that motor so you may want to think about an electric fan. The stock power brake booster is 10 in in diameter and is probably going to interfere with the valve cover on that side so you might need a smaller diameter booster if you’re running power brakes. I don’t know which starter you have on that motor but the large housing starters almost fill the exhaust path on the passenger side so you might need a mini starter. |
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#6 |
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Join Date: Jun 2009
Location: Dub VC Utah
Posts: 364
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Re: what's necessary to do a big block swap?
You can pretty much drop it right in if you wanted to. I would suggest putting BB mounts in as they're a little beefier.
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'70 K10-- 4" lift on 35"s-- For Sale http://www.ksl.com/index.php?sid=733...iew&ad=4578305 |
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#7 | |
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Join Date: May 2004
Location: Simi Valley, CA
Posts: 1,387
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Re: what's necessary to do a big block swap?
Quote:
My truck is currently drum brakes so the booster shouldn't be a problem yet. So as for the motor mounts, the big block will fit right into the small block mounts? |
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#8 |
Senior Member
Join Date: Jan 2003
Location: daytonabeach
Posts: 22,956
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Re: what's necessary to do a big block swap?
you'll need to remove the manual tranny crossmember and get an autotranny crossmember// you'll probally need to have a driveshaft built// when removing from the donor vehicle take the driveshaft so you can at least salvage the yoke that goes to the tranny
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71c-10 350/2004r/4:11 lowered3/4 longbed/dead by hurricane MEANING OF DEATH::::: SOMEBODY ELSE GETS YOUR STUFF DONT BELIEVE EVERYTHING YOU THINK TAKE MY ADVISE;I DON'T USE IT ANYWAY |
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#9 | |
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Location: Tucson
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Re: what's necessary to do a big block swap?
Quote:
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#10 |
Junior Member
Join Date: Mar 2007
Location: Hideaway, TX
Posts: 4,950
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Re: what's necessary to do a big block swap?
money
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71 Suburban 350/700R4 Project Trixie 72 CHEVY,Highlander,SWB,396,T400 |
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#11 |
Senior Member
Join Date: Jan 2003
Location: daytonabeach
Posts: 22,956
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Re: what's necessary to do a big block swap?
4core radiator is nice for a BB
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71c-10 350/2004r/4:11 lowered3/4 longbed/dead by hurricane MEANING OF DEATH::::: SOMEBODY ELSE GETS YOUR STUFF DONT BELIEVE EVERYTHING YOU THINK TAKE MY ADVISE;I DON'T USE IT ANYWAY |
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#12 |
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Location: NC
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Re: what's necessary to do a big block swap?
you can use 73 up frame stands and clam shell engine mounts.only requires drilling a couple holes .save your self some cash.
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#13 | |
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Re: what's necessary to do a big block swap?
Quote:
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junkyardjohn 69 1 TON TOW TRUCK // 84 4WD CUCV BLAZER// 85 1 TON 4WD STAKE TRUCK// 86 M1031 5/4 TON 4WD CUCV// ALOT OF OLD TRUCKS FOR ONE OLD MAN TO DRIVE. ![]() LIFE MEMBER OF P.E.T.A (PEOPLE EATING TASTY ANIMALS) DON'T RENT U-HAUL ALWAYS TELL THE TRUTH IT WILL AMAZE PART OF THE PEOPLE & ASTONISH THE REST |
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#14 |
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Join Date: May 2004
Location: Simi Valley, CA
Posts: 1,387
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Re: what's necessary to do a big block swap?
ok, I found some big block frame mounts and some headers from a member here. Aside from that and the trans cross member, the rest is all bolt on?
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#15 |
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Location: NC
Posts: 1,129
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Re: what's necessary to do a big block swap?
bb auto trans linkage,I have for $75 complete.If you have pwr steering you will need to have the metric ends on the sector end of the lines changed to standard.
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#16 |
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Join Date: May 2004
Location: Simi Valley, CA
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Re: what's necessary to do a big block swap?
got the motor and trans pulled from the donor truck!
Now to pull my 307 and 3 speed ![]() ![]() the TH400 was rebuilt 4 years ago and hasn't been driven since. ![]() Last edited by Sublvr72; 05-06-2010 at 11:54 PM. |
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#17 | |
just can't cover up my redneck
Join Date: May 2004
Location: Columbus OH
Posts: 11,414
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Re: what's necessary to do a big block swap?
You are going to need to swap in a radiator that has the auto trans cooler too....and what about the induction system? Are you planning on running that TBI or converting to a carburetor?
These "for cheap" swaps have a tendancy to get spendy...
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Bad planning on your part does not necessarily constitute an instant emergency on my part.... The great thing about being a pessimist is that you are either pleasantly surprised or right. ![]() Last edited by LONGHAIR; 05-07-2010 at 06:35 AM. |
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#18 |
Redefining LowBudget
Join Date: Mar 2009
Location: lebanon Cow Hampshire
Posts: 4,538
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Re: what's necessary to do a big block swap?
your going to need to wire up the trans shift switch...( it maybe on the peddle of the parts truck)..do your self a BIG favor..take a week and clean and paint everything...put you new carb on get rid of all the polution stuff and if your going to run the stock exhaust maniford put new studs in..it should look like this...it will make the install go much easyier
waiting for the pics to upload I remebered the feed for the HEI needs to be 12V and check the oil sending unit so you can hook it up to your gauge..save the line that gos to the power barke booster you'll kick yourself later if you don't..its the little things that will slow you down and make for 10 trips to the parts store notice the new mounts and stands sitting there Last edited by Hottrucks; 05-07-2010 at 07:37 AM. |
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#19 | |
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Join Date: May 2004
Location: Simi Valley, CA
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Re: what's necessary to do a big block swap?
Quote:
I already realize this isn't going to be a cheap swap, but I guess the end result should be worth it. |
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#20 |
Redefining LowBudget
Join Date: Mar 2009
Location: lebanon Cow Hampshire
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Re: what's necessary to do a big block swap?
wish you where closer I have a bunch of parts to get you rolling they arn't great but usable things like a straight auto column ( your going to need the linkage parts or you could go with a locar floor shifter and leave yours)a 3 core rad and auto X memeber...dam...but most of that can be found in the bone yards or from local memebers...
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#21 |
Junior Member
Join Date: Dec 2006
Location: Southeast Missouri
Posts: 2,436
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Re: what's necessary to do a big block swap?
When we put a '73 454 in my '71 with a old style 4 speed we used BB motor mounts and stands from a '74 C-20.
We did have to drill new holes, but the engine and transmission works great together without having to change the drive shaft. One mistake we made is we used the stock starter instead of a mini starter so the engine has heat soak problems. Danny
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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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#22 |
Account Suspended
Join Date: May 2004
Location: Simi Valley, CA
Posts: 1,387
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Re: what's necessary to do a big block swap?
big block motor mounts.... check
big block headers.... check big block.... check trans.... check still need... intake manifold carburetor fan auto x member fuel pump AT radiator Last edited by Sublvr72; 05-09-2010 at 04:42 PM. |
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#23 |
Senior Member
Join Date: Aug 2003
Location: Lubbock, Texas
Posts: 2,443
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Re: what's necessary to do a big block swap?
A BB/th400 truck also had a high hump cab floor. I don't know if you will have clearence problems or not, but there has to be some reason the factory BB trucks have a high hump.
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72 Cheyenne Super 80 Silverado Blazer 2wd |
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#24 |
Chevy Lover Till The End.
Join Date: Dec 2009
Location: Mascot TN.
Posts: 795
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Re: what's necessary to do a big block swap?
Hey feller, I've got a factory four barrel intake and good quadrajet carb, fuel pump and clutch fan that came off my '83 454 in my '69 truck if you're interested. I may have some other stock big block stuff.
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1969 Chevy SWB Big Block - Under the knife as of 12/26/2011 1989 Chevy Silverado, 4X4 - Daily Driver 1996 Chevy Suburban K1500 - 4-Wheeler, Campin Truck 1968 Chevrolet Impala Sport Coupe - 327/350hp, TH400, all original. Members I've met: BamaBaxter, My Build: http://67-72chevytrucks.com/vboard/s...d.php?t=500359 |
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#25 |
Account Suspended
Join Date: May 2004
Location: Simi Valley, CA
Posts: 1,387
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Re: what's necessary to do a big block swap?
hmmm... I guess we shall see when it goes in... Worse case I'll cut the floor and raise it up
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