However, according to the looser hemi definition, the Ford Boss 429 engine is considered a hemi design. Of course, Chrysler ...

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

It was purely a homologation model that Ford needed to be able to race their new engine in NASCAR. The 429 was meant to outshine Chrysler's 426 Hemi. Around 900 Boss 429 street cars were built ...

Is this the rarest Boss? An all-aluminum Can-Am 429ci. Tasca Ford owned the street with this car. Bring on Hemis and SS 396 Camaros. As one of six pre-production 1969 Ford Mustang Boss 429s ...