preferably 60's early 70's iron with 2.02/1.6 valves and the 64cc combustion chambers, though might consider the 1.94/1.5 if the price is right. if you have a set that need rebuilt thats fine, or even if they are bare as long as they arnt cracked and havent been milled a ton. just pm with a price and the casting number please. thnx.
william