Holley Carburetor Heli-Coil Inserts SSMK Tethers adjust in length out

Tethers adjust in length out to 20"

Machined thicker bolting flange

resulting in maximum power production and superior drivability

1963-1963 Ford Ford 300

Holley Carburetor Heli-Coil Inserts SSMK Tethers adjust in length outUse to repair stripped fuel bowl screw threads in a carburetor main body. Also available #HLY26 2 Heli Coil Installation Kit (sold separately). 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