This open-center base gasket measures .3125" thick and is designed for Holley square flange 4150/4160 carburetors as well as square flange Holley EFI throttle bodies. Compression support grommets in the mounting corners help prevent warping, and mounting hardware is included.
Specifications:
- Gasket Bore: Open Center
- Color: Black
- Material: Fiber
- Thickness: .337" +/- .015"
- Throttle Bore: 1.75" maximum
- Thread: 5/16-18 & 5/16-24
- Stud Length: 1.62"
- Nut: 1/2" x 5/16"-24
- Part Type: Carburetor Mounting Gasket
- Product Type: Base Gasket
- Part Number: 108-12
Includes mounting studs and nuts. Do not over torque — excessive torque can warp or break the base plate.
FAQ
What carburetors does this base gasket fit?
Holley square flange 4150/4160 carburetors and square flange Holley EFI throttle bodies.
Is mounting hardware included?
Yes, mounting studs and nuts are included.
How thick is this gasket?
.3125" thick (.337" +/- .015" with the compression grommets).
Should I over-torque the mounting hardware?
No — excessive torque can warp or break the base plate.

