Interesting stuff, Appetizer; "... So this engine was no slouch and was pulling 6600 RPM. with the highest Back to top gear we could use, approx 125mph This old 1949 Gold Star had been specially built for Ray Hallett of Canterbury by Jack Amott, it was the old style non detachable rocker box, small fin engine. It had 8.1:1 ratio, 1 3/16" RN Carb , ??? inlet cam, Z exhaust, 4.375:1 Back to top gear and pulled 6200 on Sulby straight. When we got it on the dyno we got 37.5bhp which was what Nortons claimed for the long stroke Manx engine of 1951. We stripped the engine to find out what it was like internally, it seemed pretty good except for a cracked piston boss..."
http://beezagent.blogspot.com/2009/02/


BSA A65 TB 1964 in barnfind condition...