Ricardo, designed by Sir Harry Ricardo.

The early head shown here was manufactured by Thompson and Taylor at Brooklands in the 1920’s.

This one features square headed studs screwed into the top of the head. The purpose of which is unknown?

Spark plugs are more central and the section above the valves is relieved.

Reference The Austin Seven Clubs’ Association Magazine, publication No. 1989A, pages 14-20. Article by Robin Boyce and Andrew Lowe