I have a 4 lb cap on my truck with a recovery/return reservoir, 1941 radiator, and a heater. There are no problems with any of the components.

Engine is original, un-rebuilt 216. It, too has a 180 degree T-stat.

1950 Chevrolet 3100 (Ol' Roy)

1939 Packard Standard Eight Coupe (The Phantom) | 1956 Cadillac Coupe de Ville (The Bismarck) | 1964 Ford Galaxie 500 coupe |1966 Ford Mustang (Little Red) | 1969 Pontiac GTO (The Dishpit) I 1979 Ford F-100 | 1976 Ford F-150 (Big Red) | 1995 Ford F-150 (Newt)