Perfect Circle MS1038P20 P-Series Main Bearing Set Undersize Small Block Chevy - 0.020 400

The Perfect Circle MS1038P20 is a P-Series main bearing set designed for Small Block Chevy 400 engines with 0.020 inch undersize crankshafts. This complete bearing kit is manufactured by Clevite/Mahle under the Perfect Circle brand, featuring their proven Tri-Metal construction for reliable engine performance.

Key Features:

• Tri-Metal copper-lead construction with steel backing and electroplated overlay
• 0.020 inch crankshaft undersize for reground journals
• High crush qualities for maximum bearing retention
• High eccentricity design to account for bore distortion
• Reduced overlay thickness to prevent fatigue
• Color-coded for quick identification and error-free installation
• 1/2 groove design for optimal oil distribution

Application: Designed specifically for Small Block Chevy 400ci (6.6L) V8 engines typically found in 1970-1980 GM vehicles. The P-Series is ideal for rebuilding engines where more demanding use is anticipated, including heavy duty applications, motorsports, and street performance. As the most versatile replacement bearing series, P-Series bearings are suitable for most OE applications while offering upgrade capability from Bi-Metal bearings due to increased load capacity.

This is a complete main bearing set including all necessary bearings for a full crankshaft main bearing replacement. Perfect Circle bearings are trusted by professional engine builders and DIY mechanics worldwide for their consistent quality and proven durability.