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Manley Pro Series I‑Beam connecting rods for 1979–1990 Chevy big block applications are forged 4340 steel rods offered in the 6.135 in center‑to‑center length with 2.325 in big end bore and 0.9911 in pin bore. They use 7/16" ARP 2000 bolts and are available in versatile weight options; published approximate horsepower ratings include ~1000 for oval applications and 1600+ for drag configurations.
Manley 79-90 Chevy Big Block 6.135in L 4340 Pro Series I-Beam Connecting Rods - 8
