The Camaro's aboriginal year in antagonism was harder fought with a 302 individual four butt consecration system. This was the absolute accustomed by the SCCA acceptance physique in adjustment to accumulate acceleration at a reasonable amount for assurance considerations.

However, as the acceptance of the alternation increased, all attention went with the wind and for the 1968 Trans-Am antagonism season, the SCCA afflicted the rules from "Not added than one four barrel" to "Not added than two four barrels". This change came abundantly in acknowledgment to actionable branch prodding with the ambition of creating a "More agitative Trans-Am series".