This Ford Performance exclusive FP350S M-6007-M52R engine lower end rebuild kit includes: set of (8) 12:1 Mahle forged anodized pistons w/low friction coating including rings, pins, and retainers complete set of 8 connecting rod bearings complete set of main bearings w/multiple grades damper bolt This kit also fits the M-6007-A52XS Aluminator engine.