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Thanks Paul I raced last weekend and got top of the points table,but like any mower racer I want to slowly improve my machine.i have just ordered chromemoly push rods,heavy valve springs and bullet retainers and a custom 90 degree airbox to fit pod filter.sorry if this is a silly question but 6 degrees advance or retard ? My guess is advance but pays to ask and do you run high octain fuel ? I run 91 pump gas at the moment but am buying some copper head gaskets aswell .I am upto my 5th mower build but havnt done much engine wise.any help is greatly appreciated 👍