Chevy Duty has these original pictures on its weebsite (for '55 2nd series Chevrolet Trucks). My guess is that all '55 1st series Chevy trucks were 6v. Tim

[img]http://www.chevyduty.com/truck-years/1955-2nd/title.gif[/img]

[img]http://www.chevyduty.com/truck-years/1955-2nd/ill.jpg[/img]