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#1 |
Registered User
![]() Join Date: May 2009
Location: napa,ca
Posts: 38
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69 truck converting a 350 to a 396
I have a 1969 chevy shortbed c-10 with a 350. I want to put in a 396. What all do I need to switch around. for example coil springs in the front, please help
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#2 |
Blaze-Air
Join Date: Nov 2008
Location: Virginia
Posts: 1,117
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Re: 69 truck converting a 350 to a 396
I'm interested as well.
From what I know, and it's not much. You will need the motor stands, and motor mounts. You'll move your trans cross member back for the t-400 trans, you'll probably need the t-400 trans mount as well. I think you'll need a high hump trans floor pan as well. If your going for a stock cooling system, you'll need a BB radiator and fan shroud. Depends on what your accessories are, but you'll need alt , p/s brackets. You'll need pulleys from big block, or a serpentine set up. Exhaust manifolds if your not running headers. I'm sure there is more, but this is what I have gathered up so far. Anybody with more info would be appreciated. ![]() |
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#3 |
Registered User
Join Date: Jan 2006
Location: Take Off
Posts: 1,908
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Re: 69 truck converting a 350 to a 396
I have a 396 in my 67 Camaro and a 350 in my 68 C10 and that 396 likes to run hot. Be sure that you are aware of this tendency and build for it. Big blocks will be harder to cool. Make sure the cooling passages are clear. Some had casting slag in them. I would also suggest running the factory cooling system, such as a new 4 core radiator, factory BB shroud, large factory clutch fan, etc. Also be sure to run the factory pulley set up so that the water pump rotates at the correct speed. Underdrive pulleys will lead to overheating. Make sure your crank pulley is larger than the water pump pulley. Also, make sure to reduce underhood temps, like using cast iron exhaust manifolds or at least ceramic coated headers. Good luck.
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#4 |
Suburban Hick
![]() Join Date: Aug 2008
Location: Altoona, IA
Posts: 810
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Re: 69 truck converting a 350 to a 396
I'm pretty sure you don't need the high hump floor pan. I thinks thats only for manual trannys. Don't think i've ever seen a factory high hump automatic. For the engine stands and mounts there are two different styles. There are the old style for the 67-71 and the 72's. Now the problem i've ran into for the 72 ones is that no auto parts store like napa oreilly's or the such can find the motor mounts themselves. Their computers tell them that gm never put a big block in a 72 truck which we all know is alot of bull and the guy at the auto parts store wanted to argue with me over it. so anyway.They are 72 specific. From what i found they only used them that year and only on the trucks. The only place i've found them so far is LMC. They are $15 a piece.
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Mathew 1947 Chevy 3600 1951 GMC 100 1969 Chevy C-10 396/500hp TH400 lowered 4" 1968 Imapla Custom 396/325hp TH400 "Grandmas Car" 1976 Crew Cab 4x4 diesel http://67-72chevytrucks.com/vboard/s...d.php?t=488505 1978 Chevy K-10 454 1983 S10 4x4 "Bumblb" (Grandpa's truck) 1993 Chevy S10 V8 conversion 1990 Ford Probe Gt 1992 Dodge W-150 "Old Man's Truck" 1992 Pontiac Grand Prix SE 1992 Mercury Grand Marquis-Mercruiser 2000 Ford F150 (Currently my mother drives this) 1946 Farmall H with Stan Hoist loader 1965 John Deere 110 1961 Wheel Horse " Rat Tractor" |
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#5 | |
*************
![]() Join Date: Apr 2005
Location: Pensacola, FL
Posts: 17,846
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Re: 69 truck converting a 350 to a 396
Quote:
R/
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Rob - https://www.instagram.com/hart_rod_c10 As Iron Sharpens Iron, So One Man Sharpens Another. Proverbs 27:17 FOR SALE: DBW pedal bracket - http://67-72chevytrucks.com/vboard/s...d.php?t=651123 FOR SALE: Hood Brackets http://67-72chevytrucks.com/vboard/s...d.php?t=679945 1987 Silverado SWB - 34.5K original miles http://67-72chevytrucks.com/vboard/s...d.php?t=801834 1969 SuperBurb - http://67-72chevytrucks.com/vboard/s...d.php?t=200387 1968 Farm truck - http://67-72chevytrucks.com/vboard/s...d.php?t=358692 1968 SWB - http://67-72chevytrucks.com/vboard/s...d.php?t=551258 1948 Chevy - http://67-72chevytrucks.com/vboard/s...=122164&page=3 |
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#6 |
motor exploder
Join Date: Mar 2009
Location: Pittsburgh, PA
Posts: 2,346
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Re: 69 truck converting a 350 to a 396
I had a TH400 in my "69 truck with a low hump and it fit fine. Came with a 307/PG stock.
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Adam 1969 Chevy CST/10 stepside, DART Big M/TREMEC Magnum Extreme/3.73's w/Detroit Truetrac 1965 Chevy Bel Air Wagon (daily driver), 327/TH350,10 bolt w/3.08's 1961 Chevy Bel Air Sport Coupe, ZZ454/M21/9" rear w/3.50's & Detroit Truetrac 2005 GMC 1500 ccsb 2wd, 6.0L/4L65e/3.73 G80 2006 GMC 2500HD ccsb 4x4, DMax LBZ/Allison 6spd/4.56's w/Detroit TrueTrac ![]() ![]() Use the SEARCH function on this forum - it is your friend!! |
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#7 |
Under Construction
Join Date: Oct 2007
Location: Midlothian,TX (DFW)
Posts: 4,555
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Re: 69 truck converting a 350 to a 396
My parts truck is a BB auto and it has the highhump as well....
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Heath subscribe to the board here: http://67-72chevytrucks.com/vboard/payments.php http://67-72chevytrucks.com/vboard/s...d.php?t=157669 FAQ how to's 1956 Chevy Apache 1967 C10 SWB FleetSide (under construction) 1969 K10 SWB FleetSide (Future Build) 1972 C10 SWB Stepside (Future Build) 56 chevy truck : http://www.cardomain.com/ride/2955823/1 67 truck build: http://www.67-72chevytrucks.com/vboard/showthread.php?t=281357/1 69 k10: http://67-72chevytrucks.com/vboard/s...d.php?t=389470 |
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#8 |
Registered User
Join Date: Sep 2005
Location: Canton North carolina
Posts: 3,079
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Re: 69 truck converting a 350 to a 396
you will need bb fan shroud, bb frame stands -68-71 are moe plentiful but the actual mount is extremely expensive, the 72 only stands are really expensive but the mounts are cheap, new fuel pump and line to carb, pulleys for either long water pump or short (short are more expensive and harder to find) correct brackets for accessories- again eithe long or short water pump based. Th 400 mount and move crossmember to rear munting holes, th400 shift bracket or redrill and engineer to make th350 linkage work, different driveshaft. Do not worry about cab hump as th400 will fit w/o problems. Good luck.
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67 blue step side- bb 68 gold and white swb cst anniversary 68 custom swb hot rod Ls swap 69 swb cst 6 cylinder/ overdrive 69 black/black cst bb swb 70 orange and white cst Canada built truck swb bb 71 black and white super swb bb 71 red and white super swb 72 green and white super swb 4x4 62 nova wagon 400 series Ls swapped 68 Camaro 327/4 speed- 1 owner, original paint 66 Volkswagen bettle 69 auto stick Volkswagen Beetle |
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#9 |
Senior Member
Join Date: Nov 2004
Location: Vacaville, CA
Posts: 2,272
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Re: 69 truck converting a 350 to a 396
On a 69 you will probably need to upgrade to better brakes too and maybe use a 3/4 ton booster. You will also need the gas pedal for the 400 transmission kickdown. The big block alt. and P/S brackets are expensive for the factory short water pump along with the upper and lower pulleys and if you want it to look factory you will need the power steering pump that has the reservior on the fender. The shroud is a lot different too on the big block. The best thing to do is to get a donor with everything that you need.
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#10 |
OurLadyofBlessedAccelerat ion
Join Date: Aug 2007
Location: Denver, CO
Posts: 148
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Re: 69 truck converting a 350 to a 396
I have a 396 and love it, but why are you looking to convert? not hating on your project, just used to seeing people go the OTHER way!!
Here, call this guy -http://orangecounty.craigslist.org/cto/1215129927.html and you'll have every part you'll need, PLUS you can swap that 350 over to the GMC and sell it. You might even come out even if you're lucky!
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_______________________________________________ 1968 Chevy C-20 w/ 396 ![]() 1997 HD Sportster 1200 street tracker 1994 Chevy 1500 Silverado ![]() Last edited by Rippin-J; 06-17-2009 at 12:36 AM. Reason: added link |
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#11 |
Registered User
![]() Join Date: May 2009
Location: napa,ca
Posts: 38
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Re: 69 truck converting a 350 to a 396
I just want to go with a 396. I like the torque.
Last edited by Longhorn Man; 06-17-2009 at 11:51 PM. |
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#12 |
Senior Member
Join Date: Nov 2004
Location: Vacaville, CA
Posts: 2,272
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Re: 69 truck converting a 350 to a 396
The 400 is a electric kickdown that runs off the gas pedal
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