I'm going to buld my motor soon and have some questions. I plan on shaveing the head and porting the exhaust. I was thinking shave the head .030. My question is how much can I shave the head and be safe? Im using standard bore rings,and standard main and rod berings. I guess the main question is what can you do ( CHEEP ) to a 1900 to get the most out of it? I know the big thing is change to weber. What kind of HP can I get?