Hose, Radiator Kit, High Temp Silicone w/T-304 Stainless Smooth Inner Liner Clamps, 1967-78 AMC V-8 - Limited Lifetime Warranty-

Description:

• Patterned after originals upper & radiator & coolant bypass hoses
• Meets SAE 20R4 and 20R3 Type EC Class D-1 and D-2 specifications
• Molded 5-layer reinforced silicone lasts the life of your 1967-78 V-8 AMC, Rambler, or Jeep 
• Special T-304 stainless steel clamps will not rust and feature a smooth inner liner that will NOT damage your silicone hoses (unlike conventional worm or t-bolt style clamps).
• Kit Includes:  (1) Upper radiator hose, (1) lower radiator hose, (1) 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 475 F
• 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)
• Sold:  Set
• NOTE:  Requires special stainless hose clamps with a smooth inner lining that will NOT damage the silicone hose (included).  DO NOT use with conventional style worm or t-bolt clamps!

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.