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b20 f head 120-130

It's kinda hard to measure.
On the inside radius it is about 2 3/4" from the manifold surface to the valve seat.
On the outside radius the valve guide is in the way but it is around 5½" or so.
I would guess 4 to 4½" is a fair estimate for the center of the flow path.
--
George Downs, Bartlesville, Heart of the USA!






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