However, according to the looser hemi definition, the Ford Boss 429 engine is considered a hemi design. Of course, Chrysler devoted years of research and untold dollars towards perfecting its 426 ...

The Kaase heads' ports mostly mimic the production Boss 429 design but with subtle ... The original Ford head got its semi-hemi nickname from a chamber configuration that was based on a true ...

The 1969 Ford Mustang Boss 429, code-named Job 1 ... crescent-shaped combustion chambers that some dubbed the semi-hemi. The heads use intake valves measuring 2.275 inches in diameter and 1. ...

Interestingly enough, the Boss 429's cylinder heads were semi-hemispherical ... similar to the Hemi 426 but with Ford's ...

The Boss 429 was Ford's answer to Chrysler's 426 HEMI that dominated the NASCAR series ... the Boss 429 was fitted with cylinder heads sporting free-flowing intake and exhaust ports and Ford's ...

One of only five examples known to exist in this color combo, this 1970 Ford Mustang Boss 429 sold for over $600,000, setting ...

But free-breathing, canted valve heads were considered necessary ... A blue-chip collectible piece of Ford history. The hairy-chested Boss 429's purpose was, in some senses, a little simpler ...

Offered between 1969 and 1970, the pony-turned-muscle car edged out the HEMI 426 because Ford ... aluminum heads, for example, were a first for muscle cars of the 1960s. The Boss 429 also features ...

This will be the first official continuation of the legendary Boss 429 Mustang, which packed a 429-cubic-inch V8 built to take on the Chrysler Hemi engines ... of the Mustang Ford had ever built.

Passing or failing will be determined, as much as anything, by the way the Mustang Boss 302 maintains its dignity on ... 426 Hemi. Ports, too, are generous in size. The new heads are intended ...

The Kaase heads' ports mostly mimic the production Boss 429 design but with subtle ... The original Ford head got its semi-hemi nickname from a chamber configuration that was based on a true ...

No Boss 429 vehicles were produced after that because NASCAR killed off all hemi-style engines with ... And despite the fact that these were Ford's race heads, the casting quality was surprisingly ...