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Old 11-18-2020, 11:32 AM   #17
Swarm
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Join Date: Oct 2016
Location: Hanford California
Posts: 45
Default Re: 40 mercury flathead with columbia 2 speed

Quote:
Originally Posted by blucar View Post
A little added info on Columbia's and carb's.

The '42-48 Columbia's are better units than the early units. The electric over vacuum shift controls from a '46-48 makes the Columbia's very user friendly. The '42-48 units are two inches wider than the '36-40, using the '40 drive-line and banjo with '37-38 radius bars, will bolt the whole thing together. No machine work or welding. If you can find a '47-48 Columbia it will have built in provisions for a factor sway bar.
For trouble free driving, especially if you drive into higher altitudes, a four barrel is better that multiple carbs. The four barrel should be somewhere around 400 CFM.
Appreciate the help with Columbia's and the carb
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