The Stovebolt Site Forums The Shop Area Engine Shop 1966 gmc engine sizes

Does anyone know off hand what the engine options where for a 1966 gmc halfton? Checking into a truck the owner tells me it has a 250 in it, would this be correct for this truck? Or should I assume the engine was swapped out at one point, any info would be helpful to enlighten my foggy mind. thanks aaron

click here for the scoop...

We had a 66 GMC with a 250/3 on the tree..Jolly's site should have all the info.

Thanks for the link 46 In progress alot of good information there.

I currenly own a 66 GMC 1/2 ton with bone stock original 250 inline 6 engine. The other 2 engines that were available were a 305 V6 and a 351 V6. Since the only inline 6 that was stock was the 250 you can tell for sure if this truck came standard with the 250 by the VIN. If it begins with an "I" then it came with the 250. The VIN plate is on the drivers side door jam at the very top of the jam. The 6066 site has all the information to decode the VIN. Also you can check engine spec tag which is by the drivers side air vent near the e-brake handle. It will give you specs on the stock engine.