Just spent a bit of time on YouTube watching NHRA stock eliminator races. After watching lower class cars pull wheelstands, I seriously wonder what they call stock. About the only car I saw that did NOT pull his wheels was a Falcon station wagon! What can they do to remain stock in NHRA rules?
There are numerous allowances in modification. But there are certain limits.
How do they go as fast as they do? Testing, tuning, and blueprinting to the nth degree.
Stock parts modified to the nth degree. Many of those parts have to be stock or LKQ to the OE ones. Biggest allowed modification is the camshaft. While it has to be stock lift, it can be any duration. This is where the term "square lobes" comes from originally.
There is also a bit of rules figuring here too. One example I know of is the A-code 210hp 289 vs the 271hp K-code in an early Mustang. The differences is the original camshaft and exhaust, IIRC. Now, you have a 60hp difference on paper before any factoring for HP advantage. There is no way to make that power up with the allowed modifications. You have to have about 1.5 times, if not DOUBLE, the original HP to even be semi competitive plus everything else in the chassis to make it even close to the original class index, which you better be at least a half second below in case of a heads-up race with a fellow class racer.....
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