Trick Flow® small block Ford thermactor inserts are designed to thread into your heads to change the thread size. These inserts thread right into the existing cylinder head ports to allow use of the factory accessory drive bolts.

More From This Category

Autometer Fitting, Adapter, 12Mm Banjo Bolt To 1/8" Nptf Female, Fuel Pressure, Accessories

Autometer Fitting, Adapter, 12Mm Banjo Bolt To 1/8" Nptf Female, Fuel Pressure, Accessories

$23.80

Nitrous Express Tube Sleeve; Aluminum Tubing Sleeves; 0.5 in.; Blue

Nitrous Express Tube Sleeve; Aluminum Tubing Sleeves; 0.5 in.; Blue

$14.48