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Same happened to me with the flywheel bolts, specifically labeled for gen 5 lt1 but doesnt fit any socket in the flywheel to tighten it because its about a 19 mm in a 19.5mm hole. Called arp and theyre useless, clearly haven't tried to actually fit these bolts or match oem.
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BTR 225 w/CNC Heads|JLT intake|Speed Engineering 1"7/8 long tube and mid pipe|LT2 manifold w/95mmTb|Self tuned w/HPtuners|Silvers 2Way coilovers|Hotchkis front sway|Advan AD08R|BMR solid cradle bushings|Recaro SR7| Work ZR10 19"
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