i bought a summit 30x19 radiator for my 79 firebird. i run the restrictor plate with the med hole in it for a thermostat and a manual 18 inch fan with a shroud. on a 85 degree morning never goes above 180 on the freeway and 195 in stop and go traffic staying around 190 on a constant 30-35 mph cruise. motor is a 40 over 455 with two sleeves. i also have no heater in the car so i have the water port blocked at the timing cover and i connected the the heads in the rear to circulate the coolant in the rear of the heads. i think its all the the radiator you choose and fan and shroud set up.
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1970 firebird, 468, e heads,
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