Atlas 650, 600,500 cast iron barrels –the truth!

Bernhard, sorry wasnt quite clear enough.
Use the 650 bottom end , mount a 500 barrel and head or sleeve the existing barrel and use as a long stroke 500.
My aim is use the best of all this bike to get it to comply engine capacity wise to race in the 500 class.
I already have an 850 for the Open (501 cc + ) class.
Regards Mike
 
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