Stock= 4 quarts. Kevko= 5 quarts. I see a lot of people call the kevko pan 6quarts but kevko markets them as 5 and mine is clearly labeled 5quarts on the side.
You are absolutely correct. Some people seem to think just because a car w a stock pan holds 5 qts of oil that the pan is a 5 qt. WRONG.... The galleys, filter, and other passages hold an extra quart to a quart or better. I have one engine now w a kevko 5 qt pan that holds 6.5 quarts because of the bigger filter Im running.