1970 B & E-body 383
single exhaust 290hp 383 2-bbl ("L"-code E61 "blue" engine) - log manifold on RH & dual exhaust manifold on LH
dual exhaust 330hp 383 4-bbl ("N"-code E63 "blue" engine) - dual exhaust manifolds (arched "HP" style)
dual exhaust 335hp 383HP 4-bbl ("N"-code E63 "orange" engine) - dual exhaust manifolds (arched "HP" style)