The valve is held in place using a pair of valve locks and a 1.300-inch spring retainer. Compress the spring and use a magnet to remove the locks, and the valve will drop out though the chamber ...

Airborne Flying Services of Hot Springs, Ark., developed and now offers the Valve Wizard, a set of three valve spring compressor tools for Lycoming O-235, O-290, IO/O-320, IO/O-360, AEIO-360, O ...