EKHKHK56 wrote:Yes the use of stellite valve seats is common practice to repair worn out seats, or dropped seats as they are called. When the seat can not be refinished because it is beat down into the cylinder, cracked or won't clean up without machining it down too low, the new seat is the way to repair that. Need a machine shop experienced in this process of course. General automotive head shop should be able to handle. Dropped seats significantly lower flow and performance. Another method to fix is oversized valves, so you can make a new seat where there is plenty of material. I make oversized K intake valves with a KR 30° angle instead of 45°, which also is a benefit for having more material to work with on the seat area with the shallow angle. They have large K stems and 2 mm larger on the face. Exhaust seats wear much more with today's fuels and should be hard seated. The intake seats do ok from my experience. To hardseat exhaust and intake you have to cut into one of the new inserts to install the other. Erik
Erik, can you explain "Dropped seats significantly lower flow and performance."? If seated in tight, how does the cylinder lose flow (assuming you mean compression)? Also, do you have an original (or remanufacturer) part number for the oversized K intakes you have used for this?
ALSO, is it possible for an experienced welder to put a good bead on the seat, then cut it down for the current valve size? Or...is that too vulnerable to particulates breaking off and obviously ruining the seal and the other components?
Mayday