But if you're trying to say that a stock pulley drilled for lightening is allowed I think that is over the limits of the rule. Drilling or machining a stock pulley is a modification, not a substitution.

At heart the real problem is the wording "substitute" which is ambiguous at best. Considering the CRB is reviewing a rule change based on requests to allow aftermarket pulleys is a good indication that they don't see as much latitude in the rules.

But, the gist of the requested rule change is to allow alternate materials and diameters for those makes of cars where aftermarket crank pulleys are cheaper or more common than aftermarket accessory pulleys.

Now, if you can show me where the aftermarket makes steel pulleys of stock diameter but lighter than I might be willing to accept that they can be substituted for a stock pulley.



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~Matt Rowe
ITA Shelby Charger
MARRS #96