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GMC V6 and V12 Engines Engine repair and rebuilding

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  #1  
Old July 4th, 2020, 02:36 PM
zoulas zoulas is offline
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Default 305E Cooling System Capacity

Hello gents, It is my understanding that the cooling system capacity is 32 quarts or 8 gallons. I drained the radiator, pulled the two block plugs left and right, flushed the whole system with a hose. When adding the 50/50 coolant, it took 6.5 gallons or about 26 quarts. Is this normal or did I not get it all out? I ran the heater as well thinking that might help. The truck is a 1965 2500 Panel. Thanks in advance.
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Old July 4th, 2020, 08:19 PM
jagarra jagarra is offline
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Default Re: 305E Cooling System Capacity

My Motors manual for a 2500 series 305 series A,D, and E have the cooling system at
33 qts for the A and D and 34 for the E motor. this is for years 61-64.
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Old July 5th, 2020, 11:39 AM
James James is offline
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Default Re: 305E Cooling System Capacity

My truck is a 1500 and it took 8 gal.
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Old July 6th, 2020, 05:52 PM
tbucketnut tbucketnut is offline
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Default Re: 305E Cooling System Capacity

Amazing the amount of coolant, equally puzzling to me is the lack of a fan shroud
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1953 Chevrolet 3100
261 cu inch, SM420
Finished Cab off restoration

1964 GMC 1000
305 V6, SM 420
Restoration is now started
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Old July 6th, 2020, 11:33 PM
James James is offline
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Default Re: 305E Cooling System Capacity

Quote:
Originally Posted by tbucketnut View Post
Amazing the amount of coolant, equally puzzling to me is the lack of a fan shroud
My had a fan shroud. But I removed it because it was butcher up when the air conditioner was installed.
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Old July 7th, 2020, 05:49 PM
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ilvracn ilvracn is offline
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Default Re: 305E Cooling System Capacity

what about radiator partialy plugged, that could explain why the lack of capacity. take cap off, drain rad down untill you can see core tubes. check for deposits on core tubes.
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