Speed Pro 148M - Competition Series 3/4 Grooved Main Bearing Set 4.6L Romeo

Part Number	148M
Application	Ford Modular 4.6L Romeo
Size	Standard Size
Style	3/4 Groove

Highly Recommended for all Forced Inductions and High RPM 4.6 Engines. These Bearings are for the Ford 4.6 Romeo Blocks ONLY and are NOT interchangeable with the 4.6/5.4 Windsor Blocks or any of the 4.6 Aluminum Blocks.

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.