The 239 OHV Y block would have been the big V8 in the F100 and F250 in ‘55. A 272 arrived in 56.
The 55 had a slightly curved windshield and the 56 was almost the same body style with a wrap around windshield. Some even had a wrap around rear glass and are quite desirable today.
Back them the big back windows were hard to sell because the interior got so hot.
Okay, so 239 or 272 depending on whether the truck is a ‘55 or ‘56.
I think the Ford trucks from those years look fantastic. The stylists totally nailed it. The Chevys look good too but the Fords are even better.