What is a DZ 302?
Any time you increase horsepower, torque and cylinder pressure, you increase crankshaft load. It would take quite a bit more stress to rip-out 4 bolts than it would just 2, so that’s why the 4 bolt mains are stronger than the 2 bolt mains.
A four bolt main block will have four bolts that secure the main bearing caps to the block. A two bolt main block will have only two.
Late ’69 Camaros had an “X” code on the trim tag though. A Protect-o-plate can be helpful in identifying a first gen. Z28 but be careful because there are places that make reproductions of both trim tag and protect-o-plate.
This production year continues through November, and there are more 1969 Camaros produced than either of the previous years. 1….America’s other ponycar is high on the “gotta-have” list.
Did Chevy ever make a 302 engine?
Chevrolet’s DZ 302 cubic-inch powerplant is regarded as one of the most legendary small-blocks that Chevrolet ever developed. It utilized the block from a 327 cubic-inch engine, and a crankshaft from a 283 cubic-inch engine, resulting in a 302.4 cubic-inch displacement.