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Old 11-24-2017, 01:25 PM   #1
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Let's play... What is my Engine??

I'm a little confused on what engine I have. I can't find a data plate. 1985 ward body on a Chevy. Vin says 350, and wiki says 366.
It is a short bus with a hydro lift right behind the entry door. The seats were already pulled when I got the bus, so I'm not certain on the passenger capacity.

I feel a little silly for even being lost on this. I will say the carb we pulled off was a 2 barrel. Rochester was the brand. Doing a rebuild on the carb now.

I just want to make sure I'm buying the right parts. Help a noob out!

Any help would be greatly appreciated!
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Old 11-24-2017, 02:40 PM   #2
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Any chance you could post a photo?

I have a 366 in a 5 window '81 GMC. It's excelent, but I wanted a diesel and moved on.

It's hard to say from your description with a two barrel. Photos gooooood!
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Old 11-24-2017, 03:42 PM   #3
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Here are some pics. I added them as attachments.
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File Type: jpg IMG954203_01.jpg (103.4 KB, 10 views)
File Type: jpg IMG954205_01.jpg (93.8 KB, 10 views)
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Old 11-24-2017, 03:58 PM   #4
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Of the engine!
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Old 11-24-2017, 04:05 PM   #5
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Originally Posted by Robin97396 View Post
Of the engine!
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Old 11-24-2017, 04:11 PM   #6
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Face palm!! Sorry about that. I'll get some engine pics when I get home.
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Old 11-24-2017, 04:23 PM   #7
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Nice little bus. Hope it serves you well.

John
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Old 11-24-2017, 07:47 PM   #8
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the 366 was the most common on full size busses, however a 350 was optional for the lower GVWR versions of that truck.. if its a C5 or C6 series then a 350 was standard.. if its a C5 series then the 366 was Not available.. in C7's the 366 was standard and 350 not available.. I couldnt see the 'C' number on the side of the hood in your pics to see what you have.

-Christopher


great looking shortie either way!!!
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Old 11-24-2017, 09:56 PM   #9
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You should use the numbers off of the carburetor to get the right rebuild kit.
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Old 11-24-2017, 10:15 PM   #10
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It shouldn't be that hard to put a four barrel on it. The two barrel was making me thik it might be the 350, but that still doesn't make sense power weise for that large of a vehicle. I'd bet it's the 366 as Chris said.

Then again I have a shorty with a 300ci inline six thats probably a two barrel. It had a hard time going 55 on flat ground but was ok in town.
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Old 11-24-2017, 11:04 PM   #11
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2 barrel is to keep you from overheating the engine, if you put a 4 barrel on it, you will run at a higher than rated output going up a hill and overheat the engine, since people tend to go up hills at wide open throttle in buses, the carb is sized so that you can not hurt the engine doing this. if you really have a 350, you do not want to put a higher capacity carb on it, it does not have the cooling capacity to live through a long hill if you do
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Old 11-25-2017, 08:22 AM   #12
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the flow rate of a 2 barrel is also more consistent... on most 4 barrels the secondaries dont open up until the last 20% of throttle or so.. wit ha 2 barrell you get a more linear pedal.. the cam in that engine is likely designed for low end torque. and may actually max out at 4200 RPM..

my Original bus years ago was a 454 'HD'. (1986), it had a 2 barrell on it.. when I put a 4 barrell on it (holley) and tried to dial it in the darn thing would never flow enough to benefit.. I didnt overheat it but i had gone to as bigger radiator and a shrouded 8 blade clutch fan.. (I air-conditioned the driver area so i needed the bigger rad t ohandle the condensor)...

depending on the transmission you have, you may not be able to go any higher than 4000 RPM. the AT540 series I think max at 4000, and the clutches on some of the medium duty stuff were never designed to go over that..

that said, I was reckless and way-over-built that 454. and never had anything fly apart in pieces..
-Christopher
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