B58 Billet Main Caps by 5150 AutoSport Block Rings Model Years equipped with this

Model Years equipped with this motor vary by region

Supertech High Performance Valve Spring Kit

and they have proven to be a top performer in both street and racing Mazda B6 1

perfect for extreme high-boost

standard repair methods often aren’t enough

B58 Billet Main Caps by 5150 AutoSport Block Rings Model Years equipped with this5150 AutoSport B58 Billet Main Caps As power levels climb beyond 1,200+ horsepower, we've seen factory main caps begin to walk. Under extreme cylinder pressure and crankshaft loads, even the slightest cap movement can affect main bearing alignment, oil clearance, and ultimately bearing life. Our CNC machined billet steel main caps are heat treated for maximum strength and feature a dowel pinned design to positively locate each cap and virtually