Radiator Hose Kit, Rubber w/Smooth Inner Lining Stainless Clamps, 1967-78 AMC V-8 & 1972-87 Jeep V-8

Description:

• Patterned after originals upper & radiator & coolant bypass hoses
• Meets SAE 20R4 and 20R3 Type EC Class D-1 and D-2 specifications
• Molded reinforced rubber for 1967-78 V-8 AMC, Rambler, or Jeep 
• Kit Includes:  (1) 5597 Upper radiator hose, (1) 3851 lower radiator hose, (1) 2494 coolant bypass hose, (4) stainless radiator hose clamps with an effective size of 3/4" - 1-1/8", 3/8, and (2) stainless cooling bypass hose clamps with an effective size of 1-1/2" - 2", 3/8
• Temperature Range:  -40 F to 275 F (-40 C to 135 C)
• Position: Upper, Lower, & Water Pump To Intake
• Engine:  V-8
• Inside Diameter:  1 1/2" / Outlet 1 1/2" (Upper & Lower), Small ID .75" / Large ID .88" (Bypass)
• Molded:  Yes
• Spring In Lower Hose:  No, not needed (see note below)
• Weight:  4lbs
• Box Dimensions:  20 x 9 x 3 inches
• Sold:  Set
• NOTE:  Does not include lower spring or AM script

Important Note Regarding Coil Springs No Longer Used In Lower Hoses:  Original equipment molded radiator hoses often were equipped with a coil inside them. Some refer to this coil as a spring, but it isn't really a spring. Actually, it is just a piece of thin metal rod that has been twisted, it was designed to facilitate the installation of coolant on the assembly line, and nothing more.

When the cooling system of a car is completely drained, or in the case of a brand new car under construction, never had coolant in it, there is a considerable amount of air in the passageways. Normally, when filling up the cooling system, you start the car to circulate the coolant, displace trapped air, and then top it off.

On the factory assembly line, this wasn't feasible, so the air in the cooling system was evacuated by essentially pulling a vacuum on it. This also had the added advantage of speeding up the introduction of the coolant mixture to the cooling system as well. The coil in the lower radiator hose prevented the hose from collapsing under this higher than normal vacuum.  Once the car left the factory, the coil served no further purpose.  To add,  modern molded hoses are manufactured from thicker, reinforced rubber.  This is why replacement hoses usually do not have a coil in them.