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Glyn Chambers

Will, I think the most important thing to do & avoid “blowback” is to provide a splitter in the exhaust at the cylinder and exhaust stub to stop flames “tracking” from one cylinder into the other as there is a period when the pistons allow this as they allow the  exhaust ports to be open at the same time.

I did this to my veteran and it utterly transformed it.Transfer gauzes might be able to be done away with.(I don’t know I never  did this but the gauzes   never required cleaning out ).

Good Luck    “Potty”