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Old 08-23-2017, 08:24 AM   #28
johnneilson
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Join Date: Jun 2010
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Default Re: OHV for Model A engine

Quote:
Originally Posted by AL in NY View Post
Jim Brierley - I'm just says it looks like on this head the exhaust valves are larger then the intakes unless the changed the cam design and reversed the location of the intake and exhaust valves, because any high performance modification I have ever seen, the intake valves were always larger than the exhaust valves. Just wanted to understand the head design.
Al,

In the pics shown, the valves are the same size. It may look smaller but no they are not. The period when these heads were designed did not use the larger intakes. In fact, they still used the cartridge fire design for the spark plugs. Most of the designs still followed the large chamber without any squish area. The Cook design I think was a good place to start as it attempts to create turbulence.

John
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