Has far as I know they cowls were all yellow and removed fairly quickly.
My cousin Don Owen flew F4U-1D #3 with VMF-112 aboard the Bennington.
His F4U is depicted has white painted cowl (including AHII skin) but it was
yellow according to Col Dave Andre the squadron XO. Attached is Don after
landing after the first raid with battle damage. He received his 2nd DFC on
this mission.