You want me to tell you everything there is to know about modifying Morris Minor engines, don't you? Unfortunately for you, I'm NOT going to do it!
For one thing I DON'T KNOW IT ALL! (don't tell anyone I admitted that!). For another, there's just too much to know. The easiest thing to do, for all of us, is for you to go out and buy the BMC Engine Bible, a.k.a '