S58 Billet Main Caps by 5150 AutoSport Port Injection improving throttle response and expanding

improving throttle response and expanding the engine's power band

Can be installed both inside and outside

Supply 5150 with your component(s) upon receipt of payment

such as forged aluminum alloy

Mishimoto found some weaknesses that they felt obliged to improve on

S58 Billet Main Caps by 5150 AutoSport Port Injection improving throttle response and expanding5150 AutoSport S58 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