Top Quality. Made in USA! These are commercially produced valves machined for use in the U20.
 
Design and precision machining performed by experts who have been building U-20's for 30 years, not amateur parts peddlers.
 
You have found the very best quality products for your engine.  These are NOT repurposed and remachined inferior quality imported valves as sold by others. 
 
Don't believe Dean's marketing propaganda  - his products simply don't compare.
 
Money back if you don't agree these are superb!