CV4 Exhaust Valve Seat XESM1265310A25

Some models available with positive-stop "step" built in for easy installation and more importantly, the correct height, Highest tolerances for correct valve stem support and fitment in cylinder head, Built from Xceldyne's specified blend of Manganese-bronze, Heat dissipation (thermal conductivity) and valve stem lubrication are substantially increased, which leads to extended valve stem life