It is a pretty similar story with 572 Hemi crate engines, which are essentially just 426 Hemis with an increased bore and stroke. In many cases, cylinder wall thickness is a concern when it comes ...

While the "hemi" showed promise in those applications, the experimental engines were shelved ... leading to the creation of a new generation of the wildly successful 426 HEMI the following year.

A quick peek at the VIN reveals that this Challenger wasn't born with a 426-cubic-inch Hemi, but it's still a rare classic.

The new second generation HEMI measured 426 cubic inches and was built specifically ... day products (including the installation of a crate engine), to transform them into a "Mopar"-machines.

from the traditional cast-iron crate version. The new Gen III High Output 426 HEMI engine is professionally built and includes a stout, balanced lower reciprocating assembly that features a forged ...