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Old 08-18-2007, 04:02 PM
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Cooling capacity of a 350 Chevy block

Unable to get drain plug out !!! What is the cooling capacity of said block. I have flushed everything out twice and I am now ready to put coolant in.
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Old 08-18-2007, 06:18 PM
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Which drain plug? Radiator or the 2 on the block?

If the radiator, just pull the lower hose off the radiator and let it drain. Even better if you can back it up on a curb or something to give it some forward tilt.

For a real good drain, there are drain plugs on the block, down by the oil pan rail, about center front to back. Usually a 9/16" head.

Once empty, I usually add 1 1/2 gallons of AF and then the rest with water.

Mark
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Old 08-18-2007, 06:34 PM
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Cooling capacity

Antifreeze works best when mixed in a 50/50 solution with distilled water. As for the capacity we'd really have to know what vehicle, how big is the radiator, is the heater hooked up etc, etc. What I do is mix the antifreeze ahead of time, then no matter how much I add it's mixed 50/50.
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Old 08-18-2007, 06:38 PM
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"What I do is mix the antifreeze ahead of time, then no matter how much I add it's mixed 50/50."

Nothing like a little common sense to the fore.
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Old 08-18-2007, 10:12 PM
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What's antifreeze?
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Old 08-18-2007, 11:20 PM
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Capacity depends on what kind of vehicle it's in. A '72 Nova with 350 & factory air (3-core radiator) supposedly holds 17 quarts.

www.autozone.com has specs on lots of cars. Click on repair info, then specifications, and plug in your car data. It'll tell you how much anti-freeze you need, and doubling that figure will get you close.
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Old 08-19-2007, 06:33 AM
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Cooling capacity

Good one Jmark.
One of my brothers was stationed at Fort Bliss back in the 60's. He swore a car could get a scratch down to the steel on it and the bare steel wouldn't rust. It was also mechanic heaven because you didn't have to use a torch or gallons of penetrating oil when taking apart nuts and bolts on 5 year old cars.
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Old 08-19-2007, 06:35 AM
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Cooling capacity

PS, In case you don't know I think he said Fort Bliss was in the southwest corner of Texas on the Mexican border.
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Old 08-20-2007, 07:19 PM
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It just occurred to me that if you couldn't get the radiator plug OR the block drain plugs out, you'll have some residual flush water still in the block, and you'll need to allow for that when you mix your coolant.

Best way I know is to find out exactly how much pure anti-freeze you'll need, and pour that in first, then top it up with water. Do it through the opening in the intake where the thermostat goes, and you'll get more in without having to start the engine. Make sure the 'stat housing's not corroded while you have it off.
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Old 02-29-2012, 08:13 AM
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Antifreeze fill

I always drill a small hole in the thermostat to allow for air to escape and prevent an airlock
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