1966-1968 C2-C3 Big Block 427 RH Radiator Support Bracket 3886878 - OEM Number(s) (3886878)
Restore factory-correct radiator support alignment on your 427 Big Block C2.
This reproduction 1966–1968 passenger-side upper radiator support bracket is designed exclusively for 427 big block Corvettes, matching original factory geometry, thickness, and weld-nut placement. Stamped and formed like the original, it installs using factory mounting points to properly support the radiator and front structure without stress or misalignment.
Fits the Following Corvette Models
- 1966–1968 C2-C3 Corvette
- 427 Big Block engines ONLY
- RH / Passenger side
- Not for small block applications
- Not for aluminum radiator setups
Features / Benefits
- Direct replacement for GM 3886878
- Correct 427 big block–specific configuration
- Stamped and formed steel construction
- (2) factory-style weld nuts attached
- Black protective finish (prep recommended for final coating)
Dimensions
- Overall length: 4-11/16"
- Inner span: 3-13/16"
- Overall height: 3-1/8"
- Base width: 2-5/8"
- Profile depth: 2-5/8"
- Upper tab width: 1-3/4"
Tech Notes
- Big block 427 bracket only — geometry differs from small block supports
- Verify radiator type before installation
- Always test-fit before final tightening to avoid support stress
Because Details Matter
Big block Corvettes demand big block–specific hardware. Using the wrong radiator support bracket can introduce stress, alignment issues, and future cracking. This correct 427-only reproduction restores proper structure the way GM engineered it—quietly, invisibly, and correctly.
Also known under these part numbers: (For reference only)
- 242011R
- 33039
- 3886878
- B3103R