Looking for a manifold to give your big block Chevy a real shot in the arm? World Products' single plane Merlin intake manifolds are designed for superior throttle response and down-track performance. They're made with World's exclusive RightCast technology for a smooth interior and good flow, and their runner sizes are big enough to feed engines up to 540 c.i.d, with separate designs for 4500 Dominator and 4150 carbs. The Dominator version's power band runs from 2,500 rpm to 8,500 rpm. Merlin manifolds fit either standard or tall-deck blocks, are lighter than many competitors, and have cast-in bosses for nitrous or fuel injection.