Angle Milling

I believe Y"all looking at this the wrong way. Its not the relationship of the angle of the valve to the head or block, its the angle to the runner. Your trying to get a straight shot into and out of the cylinder bore and flow past the back of the valve face instead of into it or hitting it. Angle milling does not change the relationship of the valve to the runner or port.It will change compression if the chamber is lessened and 1 degree is not as much as you think. .0174 over an inch. So it would be angle milling .0694 off one side of a 4 inch wide head. Multiply that number by the number of degree's of change desired. Bolt holes need to be bored on position when bolt interference occurs as does with the locating dowels. Bolt seats must be spot faced so bolts do not bend and weaken the heads. Gasket faces on intake and exhaust also need to be corrected. I believe the idea with angle milling heads is to increase compression without weakening the head by cutting too much meat off the chamber face of the head and ruining the seal. There's not a lot of meat on the head since LA motors were designed to be light. You might get some benefit from raising the intake runner but perhaps lose it on lowering the exhaust runner.