Valve Seat inserts

[Richard Knight]

As Terry mentioned by the time a model A block needs rebuilding it may have had many valve jobs. Thus sinking the valve into the block. This shrouds the valve and affects performance. It is best if the valve sits up high on the block. For me it just made more sense to install 8 seats and surface the block.010 or .015. the seats could then be ground to a proper width and the valves would sit proud of the block. The exhaust seats were stellite and the intakes were cast iron. The standard press fit for seats was .0045 and I can tell you that is a tight press and they will not come out. I can't answer the O.P.s question on who makes seats now but stellite was the material.