Stock Model A head
 

How much can safely be milled off a stock Model A head to increase compression?

Re: Stock Model A head
 

Not enough to make the effort worth it. There's just too much volume in the combustion area.

Re: Stock Model A head
 

well, you know the gen is working, the engine will keep running with a battery cable disconnect because the gen is putting power to the coil, disconnecting a batt cable is the fastest way to find out which is bad, a reg or gen. if engine dies the gen is bad, if it keeps running the reg is bad,