Rimflow valves

[Don Malling <dmallin@attglobal.net>]

List, 

I'm reading David Vizard's "Tuning the "A" Series engine" and he talks a
lot about Rimflow valves. I see at the APT site http://www.aptfast.com/
they are available for MG engines but not Triumph. Anyone know if they
are appropriate for TR250/TR6 engines or know where to get them? 

Don Malling