This billet fill cap kit lets builders add a fill cap or inspection plug anywhere it's needed. CNC machined from 6061-T6 billet aluminum with a bright black anodized finish and a laser-etched Holley Equipped logo, it bolts on with an O-ring seal via a 4-bolt flange.
Specifications:
- Flange: 2.17" 4-bolt style
- Opening Diameter: 1.38"
- Thread: 1-1/2"-12
- Material: 6061-T6 Aluminum
- Finish: Black Anodized
- Hardware: Stainless steel, included
- Part Number: 241-230
Bolt-on installation with an O-ring seal and an easy-to-grip screw-on cap.
FAQ
How does this cap install?
It bolts on using a 2.17" 4-bolt flange with an O-ring seal and included stainless steel hardware.
What is the opening diameter?
1.38 inches.
What is it made of?
6061-T6 billet aluminum with a black anodized finish.

