Dave, when ever I get a cylinder replated i always use a compound (something like 424 or 246) If they are just snugg I turn up a new pipe and press it it at work.
Parts required, i may have a barrel that will go again with out plating. I will have to have another look at it. I have base gaskets etc in stock at my house but I dont have a 21 piston or head gasket.
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If I have to take the carbs off once more...