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Message: <blockquote data-quote="96blak54" data-source="post: 1224909" data-attributes="member: 14727">This port is nothing like a pi heads swirl/high tumble shape. Npi is strictly swirl! There is no funnel affect with this port like every intake port known. The funnel causes the incoming air to speed up before being displaced by the valve. We wanna keep the swirl damn to promote swirl but not all of it. Laying it back  some helps unshroud the valve, but don't completely eliminate it. This will kill the swirl affect and give the incoming mixture an undirected path, even though the port will flow really good. This is proof that a flow bench results can be a hoax. Homogeneous mixture is the goal! Notice how the valve angle correlates with the port and how the mass incoming air flows over the valve. This is key for the high swirl motion in the cylinder and we want to retain that. The more the swirl affect, the better the motion, the better atomized mixture, and with all this....the more timing we can run! The better the burn .....just better all around. This is where the pi heads and ports are superior to the npi and to boot, the pi heads have a quiched area for that incoming rushed mixture to be squished into a tighter area before ingnition happens essentially creating less area for flame travel. Beautiful! !The flow bench only test flow amount from a hole! The flow bench can not show what happens after the incoming rush mixture enters that hole. This is the hoax of the flow bench. Sure the port flows to ablievion but as the piston moves to BDC that atomized mixture has no path and is recreating itself as a liquid on your cylinders walls, piston top, and reduced timing.</blockquote>