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01-21-2022, 09:43 AM | #1 |
Junior Member
Join Date: Dec 2021
Location: Auburn Maine
Posts: 23
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Model B manifold
Will a model b intake manifold work with a model a exhaust manifold that has a heater
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01-21-2022, 10:28 AM | #2 |
Senior Member
Join Date: Jun 2010
Location: San Antonio, Texas
Posts: 16,425
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Re: Model B manifold
The model B exhaust manifold was changed for an exhaust flow out at a near 45 degree angle back from the straight down out flow of the model A. If you use an accessory heater manifold for a model A on a B vehicle then the exhaust pipe would have to be modified to work. The frames of model B cars are a good bit different from the model A and may make this a challenge. If the model B engine is used in a model A car then the A manifold would be the best fit. Keep in mind that all these manifolds are old and have a tendency to droop at the outlet over time. The newer the exhaust manifold the better.
The intake manifold for the model A is a 1-inch bore while the B is 1 1/8". B manifolds aren't as plentiful as the A type. They both have a tendency to crack around the carburetor mount flange. An A manifold can be matched to a B carburetor by boring the passage or tapering it to match. The model A manifolds are available new so they may be a better choice to modify. The B manifold should work but the upper portion of the casting is a bit different than the model A and has a squared off appearance in the center T junction with the runners to the engine block. I guess it depends on how the heater duct cover for the top of the exhaust manifold is designed. There were several manufacturers of these set ups. I'm including this link to illustrate many of the different heater designs from the model A era. http://www.gwcmodela.com/pdfs/meetings/Manifolds.pdf Last edited by rotorwrench; 01-21-2022 at 11:25 AM. |
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01-21-2022, 08:03 PM | #3 |
Senior Member
Join Date: May 2010
Posts: 2,482
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Re: Model B manifold
Note; the B eng used in 33/34 vehicles had a Model A type exhaust manifold. Newc
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01-22-2022, 10:11 AM | #4 |
Senior Member
Join Date: Jun 2010
Location: San Antonio, Texas
Posts: 16,425
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Re: Model B manifold
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