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Thank you for picking that up, I meant 85mm
email (option): petermyoung@iinet.net.au
AH! The piston I used was from the "long Conrod" B33 engine. But it only works with an M21 crank and gives 633cc. I expect Ian will be along with information regarding a bigger piston for a standard M20. Ron
email (option): ronpier@talk21.com