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Old 11-24-2017, 11:04 PM   #11
Bus Nut
Join Date: Feb 2015
Location: Cincinnati, Ohio
Posts: 816
Year: 2000
Coachwork: Blue Bird
Chassis: International
Engine: TE 444
Rated Cap: 12
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
Bus Geek
Join Date: May 2009
Location: Columbus Ohio
Posts: 11,359
Year: 1991
Coachwork: Carpenter
Chassis: International 3800
Engine: DTA360 / MT643
Rated Cap: 7 Row Handicap
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..
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