[bsblguy]

1978 Trans Am 400, 4speed runs hot. Car has Holley Sniper Quadrajet, Holley Hyperspark distributor, Holley in tank fuel pump. New 4 core radiator. New fan clutch. New hoses with spring in lower hose. New 180 thermostat [2nd one]. New water pump, divider plate and bushings. Tight clearance between plate and impeller. Lowered timing from 18 to 17. Total timing set at 32. Car got up to 245 at 60 mph. Dropped to 222 at lower speed. Just replaced head gaskets today and test drove close to home. Temp got up to 225 without ac on. Will pull thermostat tomorrow and test but this is a high end stat and did same on other stat as well. Flushed cooling system before changing head gaskets. Not sure what to do next. Any ideas?