Holley Main Jets (2) - 77 Helmet Shield Drilled and slotted aluminum support

Drilled and slotted aluminum support strengthens Dirt Late Model and Modified rear roof area

1975-1979 Chevrolet K5 Blazer

The NecksGen REV and Original units come with a fixed length tether that is a predetermined length to fit most drivers

Adjustable button height sets with a custom lock nut

Holley Main Jets (2) - 77 Helmet Shield Drilled and slotted aluminum supportSet of two carburetor main jets. Holley has been the undisputed leader in fuel systems for over 100 years. Holley carburetors powered every NASCAR Cup team and nearly every NHRA Pro Stock champion for four decades. Now, Holley EFI products power these cars and are dominating the performance world. Holley products for GM's popular LS engine are dominating the LS scene as well. Holley's products also include performance fuel pumps, intake manifolds and