Dayco 70863 Radiator Coolant Hose - Lower

Dayco 70863 Curved Radiator Hose

The Dayco 70863 curved radiator hose is a lower coolant hose built for specific Chevrolet Corvette applications. Made from EPDM rubber and formed as a dual I.D. hose, it provides the curved routing needed for the cooling system on late C3 Corvette models.

Compatible with 1976 Chevrolet Corvette, lower, late; curved radiator hose, and 1977-1982 Chevrolet Corvette, lower. This Dayco Curved Radiator Hose line is focused on application-specific cooling system replacement, with dimensions and bend shape matched to the vehicle’s original hose routing.

Key Features

• EPDM construction for coolant hose service
• Black finish for a factory-style appearance
• Dual I.D. hose design with 1 1/2 in. end 1 and 1 3/4 in. end 2
• Curved radiator hose profile for lower hose routing
• Built to SAE J20R4 Class D-1 and SAE J1684 Type EC specifications
• Fits Chevrolet Corvette lower radiator hose applications from 1976 and 1977-1982

Detailed Description

Dayco 70863 is a radiator coolant hose engineered for lower hose placement on the Chevrolet Corvette. The EPDM rubber construction is suited for cooling system use, while the curved shape helps match the original hose path in the engine bay. With dual inside diameters, this hose is sized for the specific connection points used in the listed Corvette applications. This part cross-references Gates 21031 for the same application.

For buyers searching for a 1977-1982 Chevrolet Corvette lower radiator hose, or a late 1976 Chevrolet Corvette curved radiator hose, this part number provides a direct replacement option. The Dayco 70863 part number is also a useful reference when comparing cooling system hoses by OE-style dimensions and fitment.

What It Helps Address

• Cracked or aged lower radiator hose material
• Coolant leaks at the hose connection points
• Improper hose routing from a misshaped replacement hose
• Cooling system service on a Chevrolet Corvette lower hose application
• Replacement of a hose with incorrect inside diameters

Installation Notes and Tips

Verify the hose routing, end diameters, and lower position before installation. Confirm that the vehicle is a 1976 Chevrolet Corvette late build or a 1977-1982 Chevrolet Corvette with lower radiator hose fitment. Inspect the mating necks and clamps for wear, and replace any damaged sealing surfaces before installing the hose.

Quality Assurance

This Dayco hose is manufactured to SAE J20R4 Class D-1 and SAE J1684 Type EC standards for radiator coolant hose applications. The EPDM material and application-specific curved design support consistent cooling system replacement on the listed Chevrolet Corvette models.