Thats usefull information from p11m2,I understood that it was late 99 cases that had a blister that can be fitted with the 650 crank,so I will check mine now !! Its the way to go unless you can get new rods. If you use 600 barrels they will need to be slotted to clear the rods,600 long skirt pistons will need to be shortened,heads from about 59/60 got bigger valves and some think are as good as the downdraught heads.Not much from a commando fits.Looks like you have small valve head and dynamo cases,and a triumph primary case!!,Dont buy commando stuff ,threads changed ,easy mistake to make.Unless you go for complete engine.99 pipes wont fit later heads,angle changes.

Last edited by norton bob; 09/03/09 10:29 am.