rvye@roadrunner.com
Junior Member
Will a model b intake manifold work with a model a exhaust manifold that has a heater
Model B manifold
- Thread starter rvye@roadrunner.com
- Start date
rotorwrench
Well-known member
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
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:
rotorwrench
Well-known member
The Model 40/46 cars manifold was basically the same as the model A type but it had the 46-9430 casting mark. Model As can be found with this manifold since it was the factory replacement for the model A part and superseded it in service part inventories. The 1932 model B was unique and that makes it rare in the modern era.