These S&S Super Stock high performance cylinder heads are designed for 1999-2005 Twin Cam engines with the stock cylinder head pattern. Great for stock 88CI through 110CI Big Bore and stroker applications with their ported heads and larger than stock intake and exhaust valves. Heads come ready to install with valves, valve guides and valve springs. Kits can be installed with stock rocker boxes with the included S&S rocker base gaskets and are compatible with stock or stock-replacement exhausts. A matching S&S manifold must be ordered separately.