Pete Samuelson would be a good one to interject his thoughts on this too. Some of those items are port matching in the intake manifold to block ports, blending valve guide areas, and creating multi-angle valve seats to assist flowing air. Likewise there are very basic areas of blueprinting that will net gains in most areas on a Model-A block. Just going into the port or bowl area and hogging out metal does not necessarily increase airflow or horsepower. Afterwards the computer will make changes to find what is optimal for a certain RPM range. Then using sophisticated software, it will create a simulation of the airflow in both dry and wet scenarios. If you have mega-deep pockets, you can even map the ports on your block and have them digitized. With regard to porting, if you want to do porting, you need to buy/build a flow bench which is basically a manometer that tests resistance of flowing air. Matter of fact, most content you watch on YouTube relating to a Model-A is generally not very accurate anyway, so that is probably not the best source of information. The science of this is much greater than what most people can show on YouTube. Is there a guide or YouTube video or something to show where and how much porting is done? I have wanted to do some porting but don't know how.
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