The present exhaust in the head can be made larger. After moving the seating area to a larger diameter, some grinding in the port bowl would be beneficial however, not necessary.
big valves in D3 head
I searched the forum and still could not find a good answer to my question. I have a set of emission D3VE heads off an 1986 truck 460. I am pretty sure they have hardened exaust valve seats. What is the work required to install a larger exaust valve? (1.72 or 1.76) Do I need to go to summit and get larger seats and have the machine shop press the new seats in?
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Thanks for the input. I talked to the machine shop earlier today and they want to put in larger exaust valve seats. they want an extra $150 for the seats and work to install the new seats before doing the valve job. So I am ok to run the 1.75 and 2.19 in. valve combination in my D3 heads? (valves form SI Valves).
The rule of thumb is less than 4 inches total for valves.
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