Hi, with my Cadillac Fleetwood Bj. 76 with 500cui (8.2l) with 200 hp we have measured the temperature of the exhaust manifold on the individual cylinders. On all cylinders this is about 120 to 130 degrees, except on one, which always has only 95 to 100 degrees. The spark plugs are checked, spark comes. Valves have hydrostottles, can not be adjusted, compression is on all cylinders at 5 to 8 bar. Could the error lie in the carburettor or on the suction spider? Has anyone ever gained experience with this? LG Helmut