Harmonic Balancer Bolt Ford Small Block Windsor 289 302 351 & Big Block 460

Aeroflow Harmonic Balancer Bolt for Ford Windsor Engines (289–351W and 429/460)

Engineered by Aeroflow, this harmonic balancer bolt is designed to withstand the rigors of Ford Windsor small-block and big-block applications, providing reliable torque retention during assembly and service.

Key specifications

• Thread: 5/8-18"
• Head type: 12-point head with a high hex to prevent socket slippage during rotation
• Material: aircraft-quality 8740 chromoly steel, cold-forged to maximize molecular integrity
• Tensile strength: rated up to 190,000 psi, outperforming Grade 8 and OEM fasteners
• Washer: extra thick ground washer included for more accurate, uniform torque

Compatibility

Fits Ford Windsor small block engines: 289, 302, 351W. Also suitable for Ford big block engines: 429 and 460.

Benefits in practice

The combination of high-tensile chromoly steel and a robust 12-point head reduces the risk of bolt rounding or slippage during critical assembly steps, while the extra-wide washer helps promote even torque distribution across the balancer surface. This means more consistent balancer alignment, fewer reworks, and smoother engine operation over the long term.

What you get

Includes an extra thick ground washer to support precise torque application.