Speed Pro Main Bearing - Standard - Small Block Chevy 139M Harmonic Damper Bolt Also included is a built-in

Also included is a built-in seal for a leak-free installation

speed nut design

Medium Friction

will be unaffected by the MSD

1978-1986 Chevrolet Monte Carlo

Speed Pro Main Bearing - Standard - Small Block Chevy 139M Harmonic Damper Bolt Also included is a built-inSealed 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