Originally Posted by predator carb guru
......as far as tall decks are concerned, gm never produced a 454 in the tall deck version. all the 454's were standard deck....
This is incorrect. Chevrolet produced more than one tall deck 454. As an example, casting number 10134366 is a 454 4-bolt main Bowtie tall deck block as are casting numbers 14044807, 24502506. There are probably others as well that are of the 2 bolt main variety.