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01-28-2012, 11:51 PM | #1 |
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Join Date: Jul 2010
Location: mogadore ohio
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small block to big block?
will a 454 bolt right in to my original small block truck??
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1969 chevy c10 lwb stepside 250 6 3 ott 1971 chevy c10 lwb 250 6 with power steering 3 ott 1972 chevy k20 4x4 350/TH350 automatic 1978 chevy Malibu 4dr 305 2bbl (all original) 1979 chevy k10 Scottsdale 350/th350 full-time 4wd(daily driver) |
01-29-2012, 04:55 AM | #2 |
Still plays with trucks
Join Date: Jul 2009
Location: Spokane, WA
Posts: 3,556
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Re: small block to big block?
To a certain extent. You may have cooling problems and possibly crank pulley clearance issues.
When I put the big block into my 67 C10 I had to move the engine back to the rear mount points on the frame to get enough crank pulley clearance with the big block. This required me to shorten the driveshaft. The little 2-core radiator was way too small to cool the big block so I needed to upgrade the radiator to the wider and thicker factory big block one to keep it cool. Otherwise it is a pretty straight forward swap. The stock motor mounts are pretty weak so you will want to get some more modern ones that are interlocking at the least but I would suggest upgrading to clamshell style mounts that will not fail and will also give you much better header clearance than the stock motor mount towers offer. Square body engine mount brackets and clamshell mounts pretty much bolt right into our trucks.
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miSSed opportunity - ground up creation of an AWD 1994 454 SS that never was http://67-72chevytrucks.com/vboard/s...d.php?t=795577 69 C10 shortbed stepside 400 small block - built like what a super sport truck could have been 69 K20 lwb TBI 350 4L60E NP208 14-bolt Dana-44 w/disc 68 Camaro SS / RS 500hp 439 inch roller cam big block 4L80E 79 Malibu TPI 350 4L60 w/ Z28 steering & sway bars |
01-29-2012, 11:28 AM | #3 |
Junior Member
Join Date: Dec 2006
Location: Southeast Missouri
Posts: 2,436
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Re: small block to big block?
It is not real hard to put a BB in a SB truck, but as mentioned above does require some mods.
Some things that have to be done depends on what transmission you will be using. We replaced the 350 with a 454 in my '71 C-10. We kept the old granny 4 speed that was originally hooked to the 350. We tried the '71 SB mounts, but they would not allow clearance for the headers so we went with the '73 BB mounts that came with the engine. We lowered the engine in and mated it to the transmission and let the engine settle where it wanted to on the frame rails. We drilled new holes to be able to bolt the engine in. We used the fan shroud off of the '73, but did have to modify it some. We also had to modify the the change the position of the clutch Z bar bracket on the frame and modify the Z bar length some. Doing it this way we did not have to modify the drive shaft and there was plenty of room on the back of the engine to the firewall and at the front to the 3 core radiator.
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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. |
01-29-2012, 12:27 PM | #4 |
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Re: small block to big block?
What year is your truck? '68 to '72 were built to fit a big block. As stated above, you will want different motor mounts, and possibly a different radiator, depending what you have now. If you run tall valve covers, they may hit the firewall on the passenger side when you shift the engine back to the back motor mount holes. Other than that you should be fine. Check out this thread.
http://67-72chevytrucks.com/vboard/s...d.php?t=395310 |
01-29-2012, 02:16 PM | #5 |
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Join Date: Jul 2010
Location: mogadore ohio
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Re: small block to big block?
its goin in a 69. i havnt figured out what tranny im gonna use , i know it will be a manual. i just happened to come across a running 454 at my local pull-a-part and it only cost me $175 and its complete with alternator and power steering pump. so now i gotta put it in something!
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1969 chevy c10 lwb stepside 250 6 3 ott 1971 chevy c10 lwb 250 6 with power steering 3 ott 1972 chevy k20 4x4 350/TH350 automatic 1978 chevy Malibu 4dr 305 2bbl (all original) 1979 chevy k10 Scottsdale 350/th350 full-time 4wd(daily driver) |
01-13-2016, 11:22 PM | #6 | |
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Location: Lula, Ga
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Re: small block to big block?
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01-14-2016, 05:22 PM | #7 | |
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Location: Utah
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Re: small block to big block?
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01-14-2016, 07:27 PM | #8 |
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Join Date: Jun 2013
Location: Grand Rapids Michigan
Posts: 291
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Re: small block to big block?
We're talking c10 and not a k10 right? 4wd makes the swap a whole different animal...
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My build thread: http://67-72chevytrucks.com/vboard/s...96#post7439296 |
01-16-2016, 12:37 PM | #9 |
Senior Member
Join Date: Jun 2005
Location: Winona Lake, IN
Posts: 6,330
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Re: small block to big block?
I went from a 250 to a 402. Bought all of the big block specific parts and just shortened the stock driveshaft to 59.5 inches. Used the stock mounting location also. It was straightforward and not difficult. Mine has a TH400 trans. I already had a 3-row radiator and the engine runs at normal temp and has not gotten hot once. I have not hauled a load with it or pulled a trailer so I cannot speak to those conditions but I don't believe it would overheat. Good luck with your swap.
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70 C/10 SWB 402/TH400/3.73 "The Needy Beast" 200,000 Mile Club Disc Brake Club Owner installed options: Front Sway Bar Power Steering Power Brakes Cigar Lighter Courtesy Lights Deluxe Side Markers Wiper Delay Power windows Power Locks Sniper EFI 2015 Silverado 1500 LS 4.3/6L80/3.23 lowered 2" front & rear |
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