Originally Posted by Glowgeek

On another note, can the valves be lightly lapped with polishing compound on this engine? I have an intake valve leak even though everything looks great, very clean. No debris on the valve stem or guide, no binding or sticking and the valve spins against the seat by hand with no discernable catches. The valve grind looks smooth under magnification but I have no way to view the valve seat in the cylinder up close. The valves will hold a cylinder full of alcohol overnight but I can hear it hiss air past the valve on the compression stroke. What do you all think?