03-18-2020, 06:37 PM | #1 |
Registered User
Join Date: Dec 2018
Location: Colorado Springs
Posts: 19
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Cooling ???
Hey everyone have a radiator question. Have a 65 gmc with the 305 v6. Getting ready to be able to pull a 5th wheel camper. Down to installing a bbc. It's a stock 77 454. Have everything gathered and hoping to get started this weekend. Biggest question is has anyone done this and kept the stock radiator. It has a 3 core in it now. If I install a shroud along with what I think is a stock 6 blade fan and clutch. Maybe install a lower temp tstat. What's your thoughts
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03-18-2020, 06:45 PM | #2 |
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Join Date: Mar 2014
Location: Tacoma Wa
Posts: 146
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Re: Cooling ???
Shroud would definitely help. I never could understand why GMC didnt use shrouds with their V6 engines, maybe because it has such a huge cooling capacity, mine takes north of 8 gallons to fill.
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1953 3100 261cu in, sm420, 3.55 torque tube, omaha orange 1964 GMC 1000 series,custom, 305E, sm420 |
03-18-2020, 09:05 PM | #3 |
It's Better With Nitro
Join Date: Apr 2008
Location: Chino Hills, CA
Posts: 2,262
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Re: Cooling ???
I think you might end up fighting cooling issues if you don't go with a higher capacity radiator (4-core) when you install that Big Block. I ran the same pair of electric fans on my 4-core radiator with a shroud that had no problem keeping a small block Chevy cool. When I built and installed my 462 Pontiac, it was a different story - it would quickly go to 210+ idling in traffic. I had to modify my shroud with a couple of pressure release vents and run a pair of H.O. Derale shrouded fans inset into the radiator shroud to increase the airflow efficiency over the fins. It now stays in the 180-190 range.
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1963 C-10: Deluxe-optioned cab, shortbed, fleetside Pontiac 462 ci, Kauffman D-Port alum. heads 4L80E, narrowed sheetmetal Ford 9-inch Tubular front and rear suspension Custom 6-piston front disc and 4-piston rear disc brakes |
03-18-2020, 09:45 PM | #4 |
60-66 Nut
Join Date: Mar 2007
Location: Coeur d'Alene, Idaho
Posts: 23,252
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Re: Cooling ???
I agree on going with either a 4 row core copper/brass radiator or a 2 row core aluminum radiator. Both with a good shroud and fan(s).
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Power Steering Box Adapter Plates For Sale HERE Power Brake Booster Adapter Brackets For Sale '63-'66 HERE and '67-'72 HERE and '60-'62 HERE and "60-'62 with clutch HERE Rear Disc Brake Brackets For Sale. Impala SS calipers HERE Camaro Calipers HERE D52 Calipers HERE 6 Lug HERE Hydroboost Mounting Plates HERE |
03-18-2020, 09:49 PM | #5 |
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Join Date: Dec 2018
Location: Colorado Springs
Posts: 19
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Re: Cooling ???
That's what I'm afraid of. Especially pulling a 33ft 5th wheel threw the mountains here in Colorado. What radiator did you go with. I've found a aluminium 4 core on Amazon for 340. Comes with a shroud. fan and temp switch w/ wiring. Didn't really want a nice shinny pretty radiator but I really can't afford a direct replacement from U.S. radiator or champion.
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03-19-2020, 01:54 PM | #6 |
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Join Date: Jul 2006
Location: San Jose, CA.
Posts: 37
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Re: Cooling ???
Years ago I had a leaking radiator and took it in for repair. Told my guy I regularly run at a GCVW of 17-18,000 lbs. and sometimes it runs hot. He guaranteed he'd make me happy. He built me a 5 pass radiator using the stock tanks. No matter how I run, light or heavy, flatland or 21% grades in 4 low heavy with 102 F outside temp, the temp gauge runs at constant 190 degrees.
My GMC, 1965 ¾ ton 4X4, 305E, fuel injected, stock fan, no shroud. I run John Deere antifreeze in all my trucks, need it for all the diesel rigs. Butch |
03-19-2020, 03:19 PM | #7 |
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Join Date: Jan 2013
Location: Las Vegas, NV
Posts: 1,857
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Re: Cooling ???
Won't DOT have an issue with you when the stock gross is less than what your pulling? Hope you got good brakes.
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1962 shortbed 408cui small block, TKO 600 5-speed, bagged Porterbuilt suspension. 18" Salt Flats http://www.cardomain.com/ride/332579...t-c-k-pick-up/ http://67-72chevytrucks.com/vboard/s...d.php?t=560081 |
03-19-2020, 09:55 PM | #8 | |
60-66 Nut
Join Date: Mar 2007
Location: Coeur d'Alene, Idaho
Posts: 23,252
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Re: Cooling ???
I hope your truck is either a 3/4 ton or better yet a 1 ton, with disc brakes up front and preferably hydroboost brakes.
Quote:
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Power Steering Box Adapter Plates For Sale HERE Power Brake Booster Adapter Brackets For Sale '63-'66 HERE and '67-'72 HERE and '60-'62 HERE and "60-'62 with clutch HERE Rear Disc Brake Brackets For Sale. Impala SS calipers HERE Camaro Calipers HERE D52 Calipers HERE 6 Lug HERE Hydroboost Mounting Plates HERE |
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