Oil Fill Cap GM LS w/Billet Insert

The Oil Fill Cap GM LS w/Billet Insert from Holley is an essential upgrade for any serious LS engine builder or street performance enthusiast. This precision-engineered cap replaces the factory plastic unit, delivering both functional superiority and visual impact under the hood. Whether you're running a stock LS, a carbureted conversion, or a full fuel-injected power plant, a quality oil fill cap protects your engine's most critical lubrication system from contamination while establishing a polished, professional appearance that reflects your attention to detail.

Crafted from machined billet aluminum, this cap features a solid insert design that resists vibration loosening and thermal cycling—common failure modes of OEM plastic caps in high-performance applications. The billet construction provides superior thermal stability, preventing cap degradation from engine heat while maintaining a tight seal against moisture, dust, and debris ingestion. Holley's engineering ensures the cap threads smoothly onto the factory LS valve cover opening without modification, while the premium finish and visible billet insert elevate engine compartment aesthetics without compromising functionality or introducing unnecessary weight.

This cap suits any GM LS-platform engine—LS1, LS2, LS3, LS7, LQ4, LQ9, or modern LT variants—installed in street cars, track vehicles, or restorations. Owners doing engine swaps into Camaros, Corvettes, trucks, and Gen III/IV F-bodies will appreciate the direct fit. With its combination of durability and style, this oil fill cap is a must-have for enhancing both performance and aesthetics in your engine bay.