All the Chevrolet engines whether small or bigblock V8 and sixes were nothing but passenger car engines. Chevrolet even converted the big block V8 into a truck engine by adding an extra compression ring to the pistons, adding an inch to the deck height and there the 366 and 427 trucks engines were born, truly over glorified passenger car engines and GMC was forced to drop their V6 for these junk piles in the mid 70's.