I've got one (440) and used it many times. All dimensions are correct, it even has the casting numbers on the sides. It looks like it was made right off a factory block with date casting and casting numbers. They cost over $400 new but they are sweet for quickly mocking up things like oil pan clearance, header clearance, anything in the engine compartment. Here I'm using it to put a 440 into a '54 flat fender Power Wagon.