Matching Numbers Value Calculator

The engine is typically the hardest and most scrutinized component to verify as original -- its casting numbers, date codes, and stampings are what collectors and appraisers check most closely, and it's also the component most commonly swapped during a car's life (for performance, after a failure, or during a prior restoration). Because of that, the collector market generally places the most weight on engine originality, followed by the transmission and then the rear axle.

Marque Desirability sets a reference premium for how much matching numbers typically add, because the collector market doesn't value originality equally across every type of classic car -- a common, widely reproduced model has a much smaller reference premium (around 10%) than an exotic or genuinely rare car, where documented originality is typically worth roughly 60% on top of the base value. That figure isn't a hard ceiling: full documentation applies a further multiplier on top of it, so a fully matching, fully documented exotic can price out above the 60% reference figure. Choosing the category that best matches your specific car's collector demand is one of the most consequential choices in this calculator, alongside the base value itself.

Not automatically. "Value with current matching status" always reflects your Base Car Value plus whatever premium your actual entered components and documentation currently earn -- which is zero if nothing matches, leaving that figure equal to your Base Car Value. "Value if non-matching" is a separate reference figure showing a discount off that same Base Car Value, representing what a fully non-matching example of this class of car typically sells for -- it's meant as a comparison point, not a value the first figure automatically falls to.

That depends on the ROI figure this calculator estimates by comparing the additional premium you'd gain from completing your matching set against the Estimated Cost to Source those specific missing components. For common, less desirable cars, sourcing costs can easily exceed the added value; for exotic or rare cars with a high premium ceiling, completing a matching set is far more likely to pay for itself -- but always verify actual part availability and pricing for your specific car rather than relying on this rough estimate alone.