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Old 08-11-2010, 10:43 AM   #132
Kahuna
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Join Date: May 2010
Location: NorCal
Posts: 2,617
Default Re: Boring a flathead

There has always been great discussion/arguement re the exhaust ports on a flathead. Are they restrictive? Do center dividers work? Etc. Here's my opinion: On End Exhaust Ports, the best fix is to relocate them to the very end of the block to straighten the path (a lot of work, welding, etc). The Center Ports, while not being restrictive in a mild engine, can be improved greatly with dividers. The trick is getting the right dividers in the right place. Once this is done, one of the center ports will actually draw a vacuum on the adjacent one, kinda like a header does. This means that an engine with anything more than a stock cam (overlap) will benefit. The bigger the cam, the bigger the benefit. Will it be a noticeable improvement? Doubt it, but it's another peice of the combination that is so important to the overall engine effort.
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