Wow. The info on the website says it has a custom straight 8 that's only 22" long.
....For the power train, Mr. Brauks made custom foundry patterns, cast the parts blanks and then machined the one-off straight eight L-head 115 CID 65 HP motor and three speed manual transmission. The crankshaft features a dual 90 degree offset design. Many of the ancillary motor parts are also handmade. The intake and exhaust manifolds are custom fabricated from welded tubing. The cast iron 8 cylinder head is only 22" in length.....