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Do you need to put breather lines on those covers? Not sure what the stock CalVins covers were like. With those MG adapters, you'll be using two gaskets per side and not sure if you'll need longer screws too.
I see you own Paul Lind's Vintage II. Round covers on a square head, right?
The Calvin's valve covers don't have any breather lines. So no problems there. When I order the MGCycle adaptor kits I'll ask about longer screws.
aren't those even earlier than Eldo covers? like V700?
I'd be interested in what MG tells you on that, let us know.
Chuck how about we start casting round head valve covers and you can machine the square heads into round ones?