Re: 1966 "find and fix"
They're only original once, and you've got a very nice example. When it warms up enough to give that truck a 100% clean-up all the way down to the nooks and crannys, you are going to be blown away at how that truck is going to look. I think that it'll be a good resource to us guys who like factory grease pencil marks and torque paint markings.
I like your decision to take your time on freeing up the engine. I'm pretty confident that your cylinders are going to be OK, but keep oiling them. You want to make sure your rings are free because a stuck ring can snap when you're trying to break it loose. You have a real advantage with your 6 cylinder. It's much easier to ensure that the entire piston and rings are getting oil due to their vertical position. V-8s can be a little more challenging because the oil wants to drain to the lowest point because the piston is sitting at a 90 degree angle. You may even want to consider yanking the valve cover and taking a look and clean the gunk if necessary. Put fresh oil (find one with a high level of zinc in it or add a ZDDP additive) in it and and find a pre-oiler and pump fresh oil through the lifters and get the cam lobes oiled before you fire it off. Chevy 6 cylinders are amazing engines that are incredibly durable. I think that your engine is going to be just fine.
That truck is a time capsule, keep it original.
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