Number Size Rated Horsepower Production Main Caps 340220 427 1968-1976 Four-bolt (tall-deck) 346236 454 1975 Two-bolt 361959 454 1978-1987 Two-bolt or four-bolt 364776 427 1974-1976 Four-bolt (tall-deck) 364776 454 1977-1990 Four-bolt (tall-deck) 364779 366 1968-1990 Four-bolt (tall-...
Early 396 big blocks from Chevy had a tall deck design that was 0.4” bigger than the standard decks. Typically, these engines produce massive amounts of torque stock, but top end power is lacking unless upgrades are made to improve flow. However, Chevy put the standard decks in almost all...