Harken back to the heyday of the musclecar revolution and imagine using hindsight to sit across the desk at your favorite Chevrolet dealer to order up a 1967 Corvette with the legendary RPO code L88.

Fresh Air: How much better are RHS’ LS7 cylinder heads than the stock LS7 castings? We bolt them to a hot 451ci LSX to find out There’s no official metric that keeps track of this sort of thing, but ...