I second that. I'm sure that's what the seller meant. I've never heard of a '60's-era 256. On the other hand,if the "Jimmy's weren't equipped with the 305E's,(or bigger),V-6's,the in-lines available were 250's,and 292's. Hope this helps.

Just sold: 1955 2nd Series 6500 2-Ton Flatbed Truck
Mo' Tater
In the Stovebolt Gallery
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It takes an awful big dog to weigh a ton.