These 4140 steel connecting rods are an exact replacement for stock M57 connecting rods with factory pistons. Made 100% in house on our cnc's with Ampco-45 small end bushings supplied by PPP Center. They are designed to be the strongest rods available and hold in excess of 1000hp.
The bolts included are 3/8"-24 x 1.5" manufactured by ARP in their 2000 alloy. Bolt torque spec is .0055-.006" stretch or 55lbft with ARP lube if a stretch gauge is not available.
Rod dimensions are 136mm center to center length, 30mm wristpin, and 48mm big end.
Weigh matched to +/- .5 gram per set total and end weights. Total weight per rod with bolts is ~703g, OEM BMW rod with bolts is ~670g.
FEA analysis image is for a 35K lb load applied to the connecting rod which corresponds to ~4075psi cylinder pressure.
