Thread Size: 16mm x 2.0
GM Harmonic Balancer Bolt.
For use in Gen. 3/4 LS engines only. Use of this bolt in a Gen. 5 LT can result in an oil leak.
Chevrolet Performance harmonic balancer bolts are made of high-quality steel and are heat-treated for extra strength. They feature a hex head to prevent socket slippage when loosening or tightening.