Photo 2/25 | C10 Radiating Performance 01 | The U.S. Radiator 1/2-ton C-10 radiator is designed specifically to fit the ’67 to ’70 trucks. This four-row, cross-flow unit is constructed from copper and brass to offer a long service life with maximum cooling efficiency. You can direct-fit the unit to the factory 3 1/2-inch mounts, and it features the same 1 1/2-inch inlet size with a 1 3/4-inch outlet size. Paired with an aluminum shroud made at the U.S. Radiator plant in Vernon, California, it covers the entire core face to pull the airflow through a pair of 11-inch Spal fans, which pull more than 1620-cfm over the 2 5/8-inch-thick radiator core. This low-profile shroud and fan setup only protrudes about 2 5/8 inches past the radiator’s core face, allowing more than enough space for all the engine’s accessories.
Photo 3/25 | C10 Radiating Performance 02 | First, we replaced the worn out radiator pad mounts on the bottom of the core support with a new set ordered from LMC Truck. These are designed to fit just like the OEM replacements and didn’t disappoint.
Photo 4/25 | C10 Radiating Performance 03 | The upper radiator pads and mounts are a bolt-on design. Ours were in need of replacement, just like the lower pads. The complete bolt-on replacement mounts were also from LMC Truck.
Photo 5/25 | C10 Radiating Performance 04 | Here’s a great look at the room we gained by opting for U.S. Radiator’s Thin-Line shroud with two 11-inch Spal fans. After we slid the radiator down into the lower mounts, we were pleasantly surprised with the space left.
Photo 6/25 | C10 Radiating Performance 05 | We installed the new LMC Truck upper radiator mounts. Two fasteners per side hold the rubber isolated mounts to the top of the core support, holding the radiator in place for good.
Photo 7/25 | C10 Radiating Performance 06 | We chose to replace the engine’s thermostat to ensure our new cooling system works well. This unit is rated to open at 195 degrees, which will keep our Blueprint Engines 383 right in the proper operating range on the road.
Photo 8/25 | C10 Radiating Performance 07 | Topping off the engine side of the cooling system, a brand-new thermostat housing from Spectre Performance will divert the fluids to the radiator.
Photo 9/25 | C10 Radiating Performance 08 | As the day moved into night, we still needed to get some hoses to finish off our project. With only the local big-box auto part store open, we had to make a template of the top and bottom path of the inlet and outlet hoses to figure out the length. Using a welding rod (you could use a wire coat hanger, too), we shaped out the path and measured the length. Then we headed over to the auto part store to find a replacement set of hoses.
Photo 10/25 | C10 Radiating Performance 09 | Upon our return, we slid the hoses over the thermostat housing and radiator passages.
Photo 11/25 | C10 Radiating Performance 10 | Next, we secured the hose ends with old-school-style worm-gear hose clamps.
Photo 12/25 | C10 Radiating Performance 11 | Here’s a look at the upper radiator hose and mounts into place after all the components were installed.
Photo 13/25 | C10 Radiating Performance 12 | The same process was repeated for the lower radiator hose. However, this one was a little trickier than the upper hose. Nevertheless, our welding wire template did the trick.
Photo 14/25 | C10 Radiating Performance 13 | We ordered our U.S. Radiator so we could cool the Transtar 700R4 automatic transmission along with the 383 small-block engine using the radiator. Sweet Performance located in Placentia, California, makes an awesome kit that converts the inverted-flare-style cooling line fittings to AN-style fittings. This will allow us to route our cooling lines around high-heat producers, such as the exhaust headers.
Photo 15/25 | C10 Radiating Performance 14 | Here’s the kit for installing the AN hose. First, we removed the old flare fittings from the transmission and replaced them with the new Sweet Performance AN fittings. They feature a Teflon washer to ensure a tight seal to the transmission case, and the 37-degree AN-style flare is a proven design dating back to WWII!
Photo 16/25 | C10 Radiating Performance 15 | If you have ever attempted to install an AN hose, you know they can be a real pain to assemble. We got a helpful tool made by the guys at Koul Tool in Lake Havasu Arizona. This tool can fit the different size AN-hose fittings available, which in our case is for Dash-6 hose.
Photo 17/25 | C10 Radiating Performance 16 | First step in putting together the cooling hoses was to drop the AN-hose collar into the Koul Tool capsule and set it into the jaws of our bench top vice.
Photo 18/25 | C10 Radiating Performance 17 | We pushed the hose down the funnel end of the Koul tool until the hose bottomed out into the AN fitting.
Photo 19/25 | C10 Radiating Performance 18 | Next, we removed the hose now attached to the fitting from the Koul tool and finished off the end of this hose by turning in the swivel side of our AN fitting.
Photo 20/25 | C10 Radiating Performance 19 | On the radiator side of the cooling hoses, we used a 90-degree fitting to keep the cooling lines tucked away from any moving accessories. We were pretty excited about switching over to AN fittings once we saw how neatly and cleanly our cooling lines were routed.
Photo 21/25 | C10 Radiating Performance 20 | To activate the electric fans from Spal, we paired the fans to Spal’s relay and electronic fan controller kit. This allows us to set when the fans will turn on and off based on the engines temperature.
Photo 22/25 | C10 Radiating Performance 21 | We were able to hide the fan relays and the properly sized fuse up under the dash and out of sight.
Photo 23/25 | C10 Radiating Performance 22 | Since we were working on the cowl and doing wiring, we decided to re-route the battery from the engine compartment to the rear of the truck away from the engine’s heat (remember, heat kills batteries). With our No Limit Engineering’s battery dropout kit, and this Optima Red Top battery, our cooling fans won’t have to worry about having enough power to run.
Photo 24/25 | C10 Radiating Performance 23 | We topped off the radiator with Prestone 50/50 coolant mix, making sure to bleed all the air out of the system before we hit the road.
Photo 25/25 | C10 Radiating Performance 24 | The last hose we attached was the overflow line to our cool, stainless catch bottle. Last but not least, we installed a 16lb lever release cap from Stant. When pressure builds up in the radiator and it needs to be opened, the pressure release lever allows you to safety vent off built-up pressure. Adding a 16-pound-rated cap creates more pressure inside the radiator, thus raising the boiling point of the coolant and water mix. With our cooling needs met and exceeded, we are very close to having a running C-10 on our hands!