Speed Pro Main Bearing - Standard - Small Block Chevy 139M Harmonic Damper Bolt speed nut design

speed nut design

1978-1986 Chevrolet Monte Carlo

800 / 4600 RPM

2005-2012 Ford E-150

will be unaffected by the MSD

Speed Pro Main Bearing - Standard - Small Block Chevy 139M Harmonic Damper Bolt speed nut designSealed Power builds engine bearings using materials and alloys engineered for demanding applications. We tailor our bearings to withstand punishing racing conditions. Our bearings are proven winners in NHRA, NASCAR(R) and IHRA competition. Sealed Power engine bearings include a patented contoured flange design that increases thrust load capacity and a three quarter length oil groove that enhances lubricity without compromising load capacity. The