How much milled off heads to raise compression

Hi Brooks,

My Moparmate milled '100 thousanths' which is 2.5mm and the chamber is almost flat now!
Probably 10 to 1 compression currently, but the intake face needs to be milled also, for manifold fitment.
Vey expensive way to go and the biggest problem was, it hit the intake valve area so the 2.02 valves had to be sunk down to remake the seat!
This is apparently a No-No indeed...

So be careful