Re: Does coolant flow thru heater always?
I also have a 496, itís in a Ď71 car so the radiator support & radiator flow is the same as yours.
I have no overheating issues, hereís what I have:
-Griffin aluminum radiator (25 + years old), twin 1.25" tubes
-CVR 55 GPM electric water pump
-Delay relay keeps the pump running for 90 seconds after engine shut down
-Large coolant expansion (overflow) tank
-15 PSI radiator cap
-Robert Shaw high flow 180 degree thermostat
-No heater connections
-No thermostat (intake manifold) by-pass hose
-1/8" holes drilled in the thermostat to allow warm-up by-pass
-Dual high flow electric fans
-Fans come on half speed at 170 degrees, full speed at 190 degrees
-Automatic transmission and engine oil have separate external plate style coolers
-60% water, 40% coolant mix
Sitting in traffic on a 90 + degree day, my 600 HP engine runs around 200 degrees. I havenít yet used the air conditioning.
Itís important to keep in mind that at idle engine speeds, the stock water pump and fan is hardly moving any coolant or air.
About the coolant: The higher percentage of water you have in the system, the better it absorbs and releases heat. Only use Prestone un-mixed and use supermarket distilled water. Ben, as youíre in Hawaii, you may only need like 10% water in your system.
Itís also important to use high flow fans. Most aftermarket electric fans have pretty a low CFM rating. Iíve been using high flow fans from a 1986 Toyota Camry V6 station wagon-and they work great. Half for looks and half for more airflow, Iím upgrading to a pair of Perma Cool 19114 fans which flow a ridiculous 2,950 CFM each, Iím making a proper aluminum shroud for them.
How may I help you?
1971 Monte Carlo SS454-496ci 600hp
1999 Trans Am-500hp
2003 Iszu Ascender XL Limited V8