Piston Notching
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Some people state that the PI piston allows
more valve clearance than a NPI or 4V piston. Well they are
full of it. Here are some pictures of notched PI, NPI and 4V
pistons for the PI intake valve. Take a look at the flat outer
edge to see just how far away from the dish the valve will hit: NPI Piston
PI Piston
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