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 ...

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 ...

A rare 1970 Ford Mustang achieved $627,000 at auction this month. Only 499 Boss 429s ... cylinder heads couldn’t prevent it making a mess of the weight distribution. The 429 was conservatively ...

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 ...

Produced over two years in 1,359 examples, the Boss 429 is widely ... with the Boss 429 against the 426 HEMI. Speaking of the Dearborn-based automaker’s rival, Ford took inspiration from ...

Ford’s Boss 429-powered Mustang was a homologation special that allowed Ford to run its Chrysler Hemi competitor in NASCAR. Surprising no one, the engine bred for NASCAR’s superspeedways ...

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 ...