Dipstick won't go back in

just ran into same sort of issue, swapping from 318 to 360, pulled chromeMP dipstick from 318, would not go into 360, turning crank on engine stand no go, grabbed old truck 360 dipstick i use for lining up pushrods,slid right in there! the truck one has pointier end, by my old eyes it not as thick or as wide as the chrome one.food for thought anyway