You have answered your own question, in the question
The difference is one has 8, and the other has 16.
Had you asked why, the reply might have been different.
A d16z6 has 16 valves 8 intake and 8 exhaust valves.
16.
Any two numbers that have a distance of 16 between them, such as 0 and 16, or -16 and 0, or -8 and 8, or 6 and 22.
The main difference between oxygen-16 and oxygen-17 is their atomic mass. Oxygen-16 has 8 protons and 8 neutrons, while oxygen-17 has 8 protons and 9 neutrons. This difference in neutron number results in oxygen-17 being slightly heavier than oxygen-16.
Means it has 8 valves. Some have 16.
It is exactly what it says. The number of valves the engine has per cylinder. If you have 16 valves on an 8 cylinder engine, you have 2 valves per cylinder.
8 intake and 8 exhaust for a total of 16
The differences between the numbers is decreasing by 8 each time. Therefore, since the difference between 48 and 32 is 16, the difference between the next two numbers will be 16 - 8 = 8. Therefore, the next number in the sequence is equal to 32 - 8 = 24.
8 or 16 depending on engine size.
The GCF of 6, 8, and 16 is 2. The GCF can be no greater than the smallest difference between the numbers (in this case 8-6=2).
The answer to the division is a number (8) that can be added to itself to make 16. The answer to the square root is a number (-4 or +4) that can be multiplied by itself to make 16.
Both are 13.