Perfect Circle MS2321HX H-Series Main Bearing Set Dart LS Next Block

The Perfect Circle MS2321HX is a high-performance H-Series main bearing set specifically engineered for Dart LS Next aftermarket engine blocks. Developed primarily for NASCAR racing, these bearings are well suited to all types of competition engines, making them an excellent choice for high-performance LS builds.

Tri-Metal Construction:

• Babbitt outer layer, copper-lead alloy second layer, and precision steel back capable of carrying loads up to 12,000 PSI
• Steel backings with carefully selected overlays and a high crush factor, plus a medium level of eccentricity
• Enlarged chamfers at the sides for greater crank-fillet clearance and made without flash plating for better seating

Key Features:

• Includes five bearings with 1/2 groove, standard size, and 0.001 in. extra oil clearance
• Especially good for engines that run at medium-to-high revs
• Designed exclusively for use with Dart LS Next engine blocks
• Tri-metal construction provides superior durability and load capacity

The H-Series bearings feature a hardened steel backing for maximum structural support, a copper-lead intermediate layer for strength and extended service life, and an electroplated babbitt surface layer for superior embedability and conformability. The 0.001 inch additional oil clearance provides optimal lubrication for high-performance applications while maintaining proper bearing crush and oil film thickness.