Porting and Relieving the Flathead

block picture

1 - Porting, or enlarging the intake and/or exhaust ports in the block.
2 - Relieving, or removing metal to allow the gasses to enter and exit the combustion chamber.
3 - Boring, to allow a larger piston.

Not indicated in the picture above, but shown below, is grinding the valve and seat for greater flow.

port and relieve side view


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