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38 coupe · 07-03-2011, 08:49 AM

A flathead with stock camshaft, good valves, in good tune should hit 20" of vacuum or a little better (near sea level). That said, I don't think my 37 can do that, and it's not broke bad enough to require fixing (pulling the heads and lapping the valves).

07-03-2011, 08:49 AM	#18
38 coupe Senior Member Join Date: May 2010 Location: South Texas Posts: 1,631	Re: who rebuilds distributors? A flathead with stock camshaft, good valves, in good tune should hit 20" of vacuum or a little better (near sea level). That said, I don't think my 37 can do that, and it's not broke bad enough to require fixing (pulling the heads and lapping the valves).