5/16" Unc Titanium Bolt 2.75" Uhl 12 Point Single 5/16-18" Alternators the harmonic balancer bolt is

the harmonic balancer bolt is designed to suit ford 31 cleveland and holden v8 engines

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and impeller drag

Lunati Cam Lock Plate suit LS

All 153-tooth flexplates have dual GM bolt patterns and are sized for stock 3/8" mounting bolts

5/16" Unc Titanium Bolt 2.75" Uhl 12 Point Single 5/16-18" Alternators the harmonic balancer bolt isPart Number: AF3512 2750 Aeroflow performance titanium 12 point head bolts, studs and nuts are machined from 6al 4v grade 5 titanium and the small head design is ideal when fitting into a recess or tight areas to give maximum clearance. These titanium bolts are the favored material for a fastener due to the attractive property of being a low density metal, which has a higher tensile strength than many other materials, even in higher temperatures.