Typical aftermarket exhaust manifold
bolts are much shorter than stock which after numerous heat cycles can cause
them to fatigue and start to stretch, leading to exhaust leaks and possible
breakage after repeated re-torques. The finish and coating on most of these
bolts can also lead to premature corrosion and zinc embrittlement. Replace
damaged or corroded exhaust manifold bolts with BD’s class 10.9 bolts and
black oxide spacers which improve thermal durability to stand up to the heat
and non-Zinc plated fasteners prevent zinc embrittlement.

Grade 10.9 Hardware meets a balance of high strength and high
toughness
Exhaust spacers ensure fastener operates in elastic stretch without
fracture or permanent yield
Black Oxide coating matches BD manifolds
Non-Zinc-plated fasteners prevent zinc embrittlement
Qty 12 Flange Head exhaust bolts (M10x1.5 – 60mm 10.9)
Qty 12 Black Oxide exhaust spacers
Qty 2 Stainless Steel Socket Bolts (M10x1.5 – 35mm)
Qty 2 Stainless Steel M10 Washer