That seat contact area is way too wide and too high on the valve face. The intake valve will run too cool with a wide seat, and carbon deposits will build up quickly. Intake seats need to be around .060" (1/16") wide, and just above the center of the valve face. Exhaust seats should be .090" (3/32") and also just slightly above center on the valve face. I use three angles of seating stones to alter the position and width of the seat- - - -intake angles should be 0/30/45 degrees, and exhausts are 30/45/60 degrees. I haven't lapped a valve in over 30 years- - - -I check the seat width with Prussian Blue and rely on the precision grinding of the seat to establish a seal. There are sets of hand-turned carbide seat cutters available on Ebay for adjusting valve seat width and position at very reasonable prices if you don't happen to have access to seat grinding equipment.

www.ebay.com/itm/166869548116?

Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!