valve seat

Hi can anyone tell me the valve seat size is on a Lister D , its so I can get a cutter . thanks gerry

Valve seat angles are 45 degrees and the thicker headed valve is the inlet, but you probably knew that - there are also a load of threads on this subject on the forum - I cant see one that gives specific seat size though.... so wiat for a pro to assist. best. hamish

thanks Hamish , there's one forsale but the price is getting a bit rich for a tool I may never use , but if its a size that is a one off im best getting it , just in case .