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Old 09-23-2011, 06:10 PM   #25
Terry, NJ
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Join Date: May 2010
Location: Bucks Co, Pa
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Default Re: Milling a head for compression?

Brent, Are you sure about the A manifold being 1.000? Mine was 1.250 and I machined it out .032 to 1 9/32" I was going to take more but the casting was getting awfully thin and I decided not to risk it. Do I have a B manifold? It's now about 2 - 2.5 % larger which will mean very little HP increase, but we work in small percentages sometimes.

Originally Posted by BRENT in 10-uh-C View Post
Purdy, are you sure the 'B' intake manifold wasn't 1.250" machined whereas the Model A maifold was 1.000" cast? And, doesn't the air flow go up on the square when the diameter increases? In other words, just because the size is 25% larger doesn't mean the airflow increases by 25% as it would be more.

Also, while I agree there was "only 10 horsepower" difference, I would think that a more realistic approach to this mindset would be the thought of the 'B' engine had 25% more power over the A, and the torque level was increased too.
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