These plugs Replacement for Ford 7.3L  Diesel  Engines  1988-1994 (Indirect injection) Turbo or Non-Turbo.
Cross: Replacement for Ford F2TZ12A342A,  Replacement for Motorcraft ZD9, Autolite 1108, Champion 184, AC 32G

Features:

These plugs are made to work with the factory glow plug relay/timer.
These updated plugs offer a noticeable improvement in cold weather starting. They get 100 degrees hotter and do it in 20% less time than the OEM Plugs.
For you Push-button users: Maximum firing time is 7 seconds with a full 2 second rest between firings.
These plugs noticeably improve cold weather starting!
In addition, the seal that holds the combustion chamber pressure back incorporates an ?o? ring instead of just the clamped metal-to-metal seal as on the OEM plug. This means increased durability and the elimination of combustion seepage through the plug housings.
These new plugs ensure that they not only start better, but have improved service life. Special attention has been paid to the plug tips in order to minimize potential swelling that can occur as the plugs age. Some lesser plugs can swell so big at the tip that they won't come back out of the head, that's a problem you don't need.