LS1 LS2 LS3 LS4 LSX LSA LS6 LQ4 LQ9 Engines,or LS powered hot rod. Using the original bolt to press the harmonic balancer back on is a really bad idea. Dont do it. When using the original bolt the stress is on only a few threads which can lead you to ruin your crankshaft threads.

Brand: Unbranded
Fitment Type: Performance/Custom
Interchange Part Number: 12553118
Manufacturer Part Number: 61740, 66515
Manufacturer Warranty: 1 Year
OE/OEM Part Number: 61740, 66515
Performance Part: No
Superseded Part Number: 61740, 66515
Type: Harmonic Balancer
Universal Fitment: No
Vintage Part: No
UPC: 657814754737