Ford SB Main Bearing Set Speed-Pro 3/4 Groove 129M
Part #: 129M
List Price: $154.15
Our Price: $60.12
You Save: $94.03
Ford SB Main Bearing Set Sealed Power Speed-Pro 3/4 Groove, Tri Metal, Competition Series Ford, Small Block, Sold as a set
Speed-Pro Competition Series main bearings were developed in NASCAR and Pro Stock competition. Speed-Pro Competition Series main bearings H-14 Lining material that is bonded to a premium 1020AK steel backing. That's covered with a nickel barrier, followed by a thin lead-tin-copper overplate. However, unlike other performance bearings, there is no flash tin layer on top of that.
Speed-Pro's engineers have determined that such a layer can actually move around under high loads--sometimes with undesirable consequences. The key to reducing fatigue wear in bearings is to keep the overplating thickness to a minimum
Speed-Pro Competition Series main bearings have 3/4 oil grooves for enhanced lubrication, while maintaining a maximum bearing surface area. They also feature Speed-Pro's exclusive contoured-flange thrust bearing technology for higher thrust-loading capacity.