[bmalone]

Just to comment again: Tunnel Wedge is an intake Ford made for MR engines. It was known as the Drag Racer's Delight. It is a rectangular port design like HR and LR.

Tunnel-port on the other hand, refers to the combinbation of round-port heads and intake. One requires the other. There is no interchangeability with other square-port designs (HR, MR, LR). Round-port intakes to round-port heads. Push rods run through the intake ports.