The raditors for these trucks are fit to the engine (six cylinder or V8) not the GVW. The narrower width, typically the six cylinder radiators, fit between the frame rails on the lower flange of the radiator cross member, in the factory saddles/cushions. The wider width, typically the V8 radiators, fit on the top flange of the radiator cross member, in the factory saddles/cushions. The radiator cross member has factory holes in the top flange and bottom flange, to accept the saddles, in either location, depending on how the truck was equipped at the factory.
Additionally, the wider radiators were available in 2-core, 3-core and 4-core, most commonly known as a Swamp Cooler or a Desert Cooler. To determine the number of cores, remove the radiator cap and count the number of rows of cores, visible in the top tank. All radiators were vertical-flow with the top & bottom tanks situated horizontal and the cores situated vertically. Harrison was the original equipment manufacturer of radiators in the '60-'66 Chevy trucks and HARRISON will be stamped on the top tank, near the driver side end of the tank.
All factory radiators in the '60-'66 Chevy light-duty trucks have a top-right inlet and a bottom-left outlet with the overflow tube at the 10 o'clock position. The overflow hose runs down the passenger side of the radiator, between the radiator & the shroud and is secured with two friction-fit spring keepers. The overflow hose daylights just below the radiator cross member...not considered environmentally conscience, but acceptable at the time. Overflow bottles, although adviseable, were not standard equipment.
The V8 fan shrouds fit all of the wider factory radiators, regardless of whether the truck is a C10, C20, C30, K10 or K20. I hope this information is helpful.
Last edited by 4-5-6 Chevy Trucks; 10/20/2010 1:03 PM.
