Erik, according to the Dave Bean catalog, the Hart 416B used those sizes
and the later "big valve 416B" Hart used 1.69" and 1.44" valves.
John C
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> From: Erik V. Berg <erikb@elrond.sp.TRW.COM>
> To: chapman-era@autox.team.net; ecamiel@i84.net
> Cc: lotus-cars@lists1.best.com
> Subject: Hart twink valve sizes
> Date: Tuesday, May 19, 1998 3:38 AM
>
> Howdy, all.
> Just what *are* the Brian Hart "small valve" and "big valve" twink valve
> sizes? Does "Hart small valve" imply the 1.625" intake & 1.375" exhaust
> combination, as was touted as state of the art in the old Vizard twin cam
> book?
>
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