Hooker BlackHeart Rear Dump Cast Iron Exhaust Manifold - Natural - GM LT-Series (Pair) H766003L that are merely stock cold

that are merely stock cold stamped parts (some may be case hardened for a hard surface -- but they lack core strength)

Moroso asked top engine builders and race teams to give their input during development

1980-1987 Pontiac Bonneville

1965-1974 Chevrolet C20 Pickup

Part of the DUI's performance comes from the custom calibrated advance curve

Hooker BlackHeart Rear Dump Cast Iron Exhaust Manifold - Natural - GM LT-Series (Pair) H766003L that are merely stock coldFor applications or projects where our standard Gen V LT swap manifolds (BHS516 and BHS3116 style) don't quite fit and our "center dump" manifold (BHS5188) exits too far forward, our new "rear dump" cast iron swap manifolds have arrived. These differ in that they exit in a straight down fashion much like a block hugger header but exit more toward the rear of the engine than our "center dump" manifolds. Cast out of the same Hi Silicon Moly Ductile Iron