find this article just google ish and they spun a 5.0 lincoln motor over 14,000 rpm, and obviously doubled the HP, no camshaft,or standard valves,no changes to factory shortblock. Supposedely they are producing the retrofit, but can't get any pricing.

 

Spherical rotary valve, Coates international, yeah wish they would produce some retrofit parts.

 

on their website they have engines listed in products, but no pricing, so I assume it's not fiscally practical

 

yeah ive seen that many years ago think the company was in new jersey

 

14,000 rpm

 

yup its a long read but here's some info
www.projecttransam.com/coates.html