Description
The ARP 155-5421 main bolt kit is listed for Ford Big Block 390-428 FE Series. It secures the main bearing caps to the cylinder block, making fastener choice part of the bearing-clearance and machining plan for the engine build.
Technical Highlights
- Manufacturer part number: 155-5421
- Application/configuration: Ford Big Block 390-428 FE Series
- Specified configuration: 12-Point
Selection Guidance
The specified cap arrangement, block design and windage-tray requirements determine which kit is appropriate. A similar displacement or engine-family name does not establish that different main fastener kits are interchangeable.
Confirm the block, main-cap arrangement and any girdle or windage tray before ordering. Plan these checks before final machining and bearing selection. Pay particular attention to the stated 12-Point configuration.
Installation Considerations
Have the engine builder check main-bearing bore size and roundness with the intended fasteners installed at the specified preload. Align-hone if required, using the same hardware and lubricant intended for final assembly. Follow the kit-specific instructions for thread preparation, washer placement and tightening.