LS SERIES CONNECTING RODS BC Pro Series H-Beam style connecting rods are fully CNC machined from premium grade 4340 forged steel blanks. Added features include radial grooved bushings for added pin oiling lightweight profiling on the pin end lightening hole near the big end housing bore and double ribbed cap to insure a true big end housing bore even at extended rpm's. Features beefy 7/16" ARP2000 fasteners for the ultimate clamping ability. For more information visit http://www.briancrower.com/makes/chevy/ls_rods.shtml