Not long after I bought my big block '71 I installed a 5 quart coolant recovery reservoir to replace the expansion tank. Then I discovered it would completely fill the tank to overflowing on a 100 degree day and the next morning my radiator was 3" low. It turns out the radiator must be filled to 3" low and the tank left empty because the coolant expands that much as it gets heated to 205 to 210 degrees. So with a big block fill the radiator to 3" low and leave the recovery reservoir empty. When the coolant reaches 205 to 210 degrees it'll completely fill the reservoir and then suck it back into the radiator when it cools.
toobroketoretire
Finally Got The Correct Coolant Level Figured Out
1 reading
I have a SBC and just replaced the radiator with an aluminum one with dual fans. Can't wait to see how it handles this summer.
This last summer I was stopped for road construction for about 5 minutes on an 85 degree afternoon and I watched my temperature gauge start climbing. The pilot car FINALLY arrived and we took off with my gauge showing about 240 degrees. That proves the 2400 cfm of a 16" Derale isn't nearly enough cfm. It takes at least 4000 cfm to keep an engine cool at an idle speed with the A/C on when the temperature exceeds 90 degrees. I have a used Linclon Mark IV fan that I might try next summer but I'll have to make a shroud for it. the fan assembly could be fitted into the stock shroud for a 350' but not a 454" because it's too long.
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