Quote:
Originally Posted by 35FORDOR
I have a flathead that has only an A on each head any input would be great. What is this head any year clues etc.
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"A" heads began to appear on the 1939 Ford 85HP models. Early production had the "A" located between the two forward most spark plug holes. Very soon thereafter, the "A" was located between the center pair of spark plug holes.
The engineering drawings always depicted the latter location so why many heads were produced with the "A" forward remains a mystery.
These heads were used through the 1941 model year.
The left 1939 head can be identified through the water temperature sending unit threaded hole. It will have a lip for the capillary tube to seat against. In 1940, with the introduction of the electric sending unit, the hole is drilled and tapped straight through.