Suits Small Block Ford 289/302, will not suit 351W
3500-8000rpm range, ideal for a high performance engine
Cast aluminium, natural finish
Suits square bore 4 barrel carburetors and throttle bodies

Calflow manifolds are cast in high pressure steel dies rather than the pour-in sand molds used by other aftermarket manifold manufacturers. This type of tooling costs 2-3 times more than conventional sand-cast patterns, but the finished product is worth the additional expense. And because the cores (which form the internal ports and water passages) are mounted in steel instead of sand during the casting process, there is no chance of any core shift, which sometimes go undetected in sand castings.

Hurricane Small Block Ford Single-Plane Intake Manifold, Except 351W