Oliver 77 head larger valves

mhmadboy

Member
I recently purchased an oliver 77 with an
m and w dome kit in it water got down the
exhaust and made all the exhaust valves
freeze up in the head. (Seats would be
saleable) since I will be having to do a
valve job on the tractor was looking at
putting in bigger valves from the 550 if I
would do I need new seats counter sunk in
the head or could I get away with using
factory seats at this size? I have access
to valve grinding equipment through work
trying to keep the budget down.
 
It would seem to me that if you put in bigger valves you would need to increase the size of the int/ex ports to match.
 
I looked at doing this recently on a 77 head, how are you going to deal with the valve length difference? This is why I didn t pursue it any further.
 

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