Reply to "Cylinder head identification."

George PAdmin.

Gas velocity is a factor Doug. It helps the gas column flow around the valve head, and it keeps the gas column flowing into the cylinder longer after bottom dead center, when the piston starts moving upward, so the cylinder is filled with a little bit more air & fuel.

Port shape is also a factor. A straight length of 1" tubing flows better than an equal length of 1 1/2" tubing that has a 90 degree bend in it. Dan also mentioned the little hump in the floor of the C302 heads that lifts the column, I believe to direct the flow along the port roof.

your friend on the DTBB

5/10/0611:51 PM

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