Piston I D

looks like a small dome on the sparkplug side but also looks like there is a quench dome on the closed chamber side let me know I can't tell from pic
there is also a 191
if these have a quench dome and a small dome on the spark plug size they are one of several discontinued models- pity - they really worked
but you had to machine the dome to fit or adjust gasket thickness- the usual way
you can get the specs on the KB website- just click on the picture of the piston
mike the pistons for bore size
is the dome on the intake side higher than the one on the exhaust?