While most manufacturers of small block Chevy intake manifolds have designed theirs around 350 CID engines, World Products has developed a very efficient manifold that’s proven to increase performance by 15-25 horsepower over the competition in larger displacement (383 c.i.d. and up) engines.

In addition to out-powering the competition, it’s important to note that these single plane manifolds are designed to operate most efficiently in the 2500-7500 RPM range, yet have the low-end throttle response and torque comparable to a dual plane. Look inside the plenum and you’ll see a “turtle” on the manifold floor that helps bottom-end performance.

Models that accommodate a 4150-style carburetor are available for standard SBC (P/N 061040) and “Vortec” (P/N 061041) heads. Also available machined for an Accel EFI unit (P/N 061040-EFI) or with a 4500 Dominator-style flange (P/N 061050).

Overall Height
5.625" (4150 flange)
6.625" (4150 flange, Vortec-style)
6.250" (4500 flange)

Port Size
2.000" x 1.180"