Journal Update
Corvette Exhaust Trivia
1963-1965 Corvette exhaust manifolds could have either 2 or 2½-inch outlet size, with all high-performance small blocks (like the L-79 in the Red Rocket) using the 2½-inch manifold connected to 2½-inch exhaust pipes.
After 1965 all small block engines had 2 inch manifolds, although the higher horsepower engines continued to have 2½-inch pipes, which had a smaller 2-inch connection to the manifold. Big block engines had 2½-inch manifolds and pipes.
From 1963-1967 mufflers were either standard or the optional N11 off-road mufflers which had one less baffle inside for less restriction and a more aggressive sound.
Regardless of the pipe size or engine horsepower, muffler outlets are always 2 inches.
The factory offered an optional N14 side exhaust from 1965-1967 with 2-inch or 2½-inch inlet pipes with aluminium covers.
