Tip on Valve Seat Grinding

First, use some prussian blue and observe where the old seat contacts the
valve face. If the old seat is on the valve face with no overlap, then
proceed with the simplified procedure below:

Use a 15 degree stone and cut the old seat in half.
Grind the new seat. You want intakes to be the width of a dime and the
exhaust the width of a penny (nickel in the case of auto engines).
Finish by using grinding fine grit grinding past to lap the valves.

Check your work by pouring solvent into the inverted combustion chamber
with the spark plug installed. There should be no leakage through the
ports.

You will find the new seat meets the valve face in the same area as the old
seat. This procedures saves countless trial and error grindings to get the
seat in place at the correct width.

 

Anyone who follows any of NN's procedures deserves what he gets.

pierce

 

What, you never heard of a 3-angle or 5-angle valve job? It figures.

 

breaking my own rule about feeding trolls; be wary of taking tech advice
from someone who has asked as many moronic q's as this bird...........

YMMV