.emills5@cfl.rr.com writes: What makes a manual shift engine different from a P/G engine. Cecil, The engines are interchangeable. The only real difference is the bell housing and flywheel/torque converter assemblies. The PG engine did have a crankshaft gear that was retarded about 3 degrees but this was very minor and did not affect the use of the engines. IMHO Ed Corson (CORSA member) IECC - Riverside, CA