HI RANDY , DOUGAL IS CORRECT THE AUTOMOTIVE VERSION OF THOSE ENGS OR RATHER TRUCK VERSIONS DID NOT USE TH E ASE PATTERN, THE INDUSTRIAL ENGS DID , HOWEVER ON ALLMOST ALL OF THE BELLHOUSING WHERE THE LARGE TRANSMISSION FRONT BELL REGISTERS IN THE BELLHOUSING THE REGISTER DIA IS THE SAME AS AN SAE , ONLY THE BOLT HOLES DONT LINE UP, JUST SET THE BELL IN THERE AND REDRILL THEM, I JUST CRUSHED TWO COMPLETE 4HK1 ENGS THAT WERE BRAND NEW AND COMPLETE ,FOR ISUZU , I ALLMOST CRIED , WHEN THE BIG MAGNET HAMMER CAME DOWN ON THEM ,, THEY WERE THE ORIGINAL PROTO TYPE ENGS AND HAD A LOT OF HAND MADE PARTS ON THEM THAT WERE A ONE OF A KIND AND COULD NOT BE REPLACED , THESE THINGS EVEN HAD THE STARTERS AND ALT AND IONJ PUMPS ON THEM ,ONE WAS A MECHANICAL PUMP AND TH E OTHER WAS THE COMMON RAIL TYPE . ALONG WITH 2 OF THE BIG 6 HK SERIES MOTORS , THE 4 ENGS WEIGHED 4600 LBS AND THER E WAS A LOT OF ALUNINUM THERE . JERRY