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Joe K · 07-29-2025, 07:47 AM

You might want to increase the size of the intake manifold to match the increased size of the valves.

Port polishing and "reaming the intake manifold" can accomplish this.

Ford themselves went with this in the "upgrade" from the Model A engine to the Model B - and which is probably the biggest reason for the jump to 50hp from 40hp.

All effort to make the engine "breathe" better.

And to continue the thought there is the gentleman who put a "blower" on his Model A engine - and for a $3K investment brought the engine to 75 horsepower.

Joe K

07-29-2025, 07:47 AM	#16
Joe K Senior Member Join Date: Jul 2010 Location: Cow Hampshire Posts: 5,022	Re: Larger intake valves You might want to increase the size of the intake manifold to match the increased size of the valves. Port polishing and "reaming the intake manifold" can accomplish this. Ford themselves went with this in the "upgrade" from the Model A engine to the Model B - and which is probably the biggest reason for the jump to 50hp from 40hp. All effort to make the engine "breathe" better. And to continue the thought there is the gentleman who put a "blower" on his Model A engine - and for a $3K investment brought the engine to 75 horsepower. Joe K __________________ Shudda kept the horse.