#403-145 Set/4 Zipper’s TC 3/8″ diameter, .145″ wall chrome moly pushrods

Strongest 3/8” straight-wall adjustable chrome moly pushrods we have! Unlike other 3/8” diameter pushrods, the pushrod and threaded adjuster section are machined from one piece of 145” thick-wall chrome moly. By not using an insert for the adjuster, the threaded portion remains a beefy 3/8” diameter, eliminating the chronic weak spot associated with ¼” diameter inserts. The large diameter adjustable base and locknut provide ultimate stiffness; combined with the 3/8” diameter rod, pushrod tube rubbing is eliminated. We recommend these pushrods for use in Twin Cam® engines with stock beehive valve springs and bolt-in cams for precise valve train control.