Looking at the problem from this point of view, Nick theorized that the answer was to produce hemi heads for the big-block Chevy. Massive exhaust ports provide a rapid exit for the burned nitro ...

In the late 1960s, Chevrolet built a special Hemi 302 for racing with the aid of Smokey Yunick. However, the engine never ...

Ask a big-block enthusiast what they need to make 600 hp and chances are they will point to some sort of rectangular-port head. No one in their right mind would select an oval-port head to make ...

Chevy Big Block Cylinder Heads PCV valves - Proper Breathing Techniques. The Good, The Bad, And The Ugly Of Big-Block Chevy Heads. HOT ROD Staff Writer Aug 17, 2009. See All 6 Photos.

Brodix's BB-2 Plus heads are designed to be an all-purpose head for big-block Chevys. Like the other heads, these have 119cc combustion chambers but smaller 312cc intake runners.

Seeking more horsepower and speed, Mopar engineers applied Chrysler's hemispherical cylinder-head technology, developed in the 1950s, to the Wedge's 426-cubic-inch big block, creating a 426 Hemi ...

Equipped with a hydraulic roller camshaft just like the HT502, this member of the big-block family uses rectangular-port heads and runs the same 8.75:1 compression ratio as the aforementioned 502 ...