Engines with 3 valves per cylinder, from 1929-33. It is in the USNA file with the reference 3232/452.8.

From Appendix 6: The General Airmotors Company of Pennsylvania manufactured this engine designed by R.S. Moore.

-They were five- and seven-cylinder engines that had their differential characteristic in using three valves per cylinder. Two intake and one exhaust.

-At this moment we only have two photographs of the 5-cylinder version.

“Moore 5-cylinder”

-Known as “The Three Valves”.