3/8 intake valves from .00175 to .00225 with bronze guides and good Teflon seals, .0020 to .00250 on the stock size 3/8 valves on exhaust sides has works very well for me the last 30 +years on stock cast iron Mopar heads with bronze liners, BB, Hemi and SB up twocents

Last edited by Cab_Burge; 07/08/22 12:58 AM.
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)