The spark plug gap for a 1993 Ford F-250 depends on the engine. Ford F-250s in 1993 came with several different engine options (e.g., 4.9L inline-6, 5.0L V8, 5.8L V8, 7.3L diesel). The gap specification varies for each.
You MUST consult your owner's manual. This is the only reliable source for the correct gap for your specific engine.
Without knowing the engine size, providing a gap would be inaccurate and could damage your engine.
