From the bible:
"Cars originally equipped with plastic/phenolic timing gears may substitute metal gears, provided that the design, dimensions, and cam timing remain as stock. Adjustable timing gears are prohibited on all cars unless fitted as stock."
Hmm, clearly written by engineers and not english majors.
The metal replacement gear must be identical in design and dimensions, A plastic, adjustable timing gear is stock. Therefore, the replacement metal gear must also be adjustable - i.e. identical in design.
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