Red

1968 318 amd 340s were red. The turquoise(blueish) 340 didn't start until 1969 (there are those with late 68's that would disagree). My factory 318 had a red dipstick, spring, and transmission tube/dipstick. I do have to ask why the tranny dipstick in installed in the bottom of the tube (see O-ring that goes into transmission). My guess someone took the dipsticks from a 68 or earlier engine.