5.4L Main Bearing (Iron Block Only)
Building a serious competition engine? Then you'll definitely want to check out Speed-Pro Competition Series main bearings. They were developed in NASCAR and Pro Stock competition, so you know they're tough. They're built on premium 1020AK steel backings, and overlaid with Speed-Pro's super-duty H-14 alloy. 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. These 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.
Fits Ford Modular 5.4L Cast Iron Engine block ONLY. Does not fit Aluminum 5.4L or 5.8L applications.
