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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
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| | | | Joined: May 2010 Posts: 43 Wrench Fetcher | | Wrench Fetcher Joined: May 2010 Posts: 43 | My radiator is shot on the 57 6100. I was looking at eBay for a new one. Anyone recommend one of the aluminum ones on there? Electric fan or clutch fan? Most importantly, is the radiator the same as a 3100 for the big trucks? | | | | | Joined: May 2005 Posts: 8,878 . | | . Joined: May 2005 Posts: 8,878 | It'd guess they interchange (they do in earlier years). However they are not the same. The big trucks have much thicker cores than the little trucks.
I'd keep the original mechanical fan, they are reliable and work well. | | | | | Joined: May 2010 Posts: 43 Wrench Fetcher | | Wrench Fetcher Joined: May 2010 Posts: 43 | Ok, yeah this thing has leaks in multiple places. I figured a 3 or 4 core aluminum off eBay be easiest thing. Is the original fan of the 261 ok on a 350? I know they can be a drag without a clutch. | | | | | Joined: May 2005 Posts: 8,878 . | | . Joined: May 2005 Posts: 8,878 | Don't know what to say about fans after changing engines, you hadn't mentioned an engine swap.
I was assuming original engine, thus no reason to change fan. | | | | | Joined: Apr 2005 Posts: 7,440 Bolter | | Bolter Joined: Apr 2005 Posts: 7,440 | Take some very careful measurements of the mounting holes and flanges. Order a 4 row radiator and a flex blade fan along with a fan shroud. ðŸ›
Martin
'62 Chevy C-10 Stepside Shortbed (Restomod in progress)
'47 Chevy 3100 5 Window (long term project)
‘65 Chevy Biscayne (Emily)
‘39 Dodge Business Coupe (Clarence)
“I fought the law and the law won" now I are a retired one!
Support those brave men/women who stand the "Thin Blue Line"! Hug a cop!
USAF 1965-1969 Weather Observation Tech (I got paid to look at the clouds)
| | | | | Joined: Aug 2007 Posts: 7 New Guy | | New Guy Joined: Aug 2007 Posts: 7 | Do what Martin says above about taking careful measurements and ordering an aluminum one off eBay for ~$130-150 or so. If it were me, I would put on a 7 blade fan with clutch off a 350 or 454, that way the fan stalls out when it is not needed (cool enough engine).
ken
1959 NAPCO 1/2T 4x4, 1960 GMC K20, 1960 GMC K10 Suburban, 1962 Chev K10, 1964 GMC K10 Suburban, 1966 K50 wrecker
| | | | | Joined: Dec 2015 Posts: 2,063 Big Bolt Forum Moderator | | Big Bolt Forum Moderator Joined: Dec 2015 Posts: 2,063 | I ordered an original style radiator for my 1958 6400. It had the mounting tabs for the shroud (one for a 3100 would not). Mine was WAY MORE expensive than an aluminum one, but I had heard mixed reviews on aluminum radiators, and if I get a hole in aluminum, I can't fix it with my torch and some solder!
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