1969 Greeves Griffon 

sounds sharp on the exhaust i have the 500 griffon they recon it sounds the same but deeper note uses a 91mm piston !

lovely ! i have 4 griffon 380,s

The 500 should be v/quick ,starter rollers needed then?? I hope to have mine finished for our first race in April, not looking forward to the RH gear change

did you have any porting done or was it done (port timming standard ?).