1958GMCnut,

I haven't been laughed out of the forum for awhile (to my knowledge), so here goes. How are you determining that the engine is 'locked up'. Are you using a bar on the ring gear or a big old socket somewhere...or are you relying on what the starter is telling you when it won't turn the engine over!

I am not at all familiar with a '58 GMC, but have serious doubts about a wrist pin seizing up and stopping the engine. I wouldn't even put this theory on my list of top 100 possibilities.

Until I used a BF-BAR to verify the engine was locked tighter than a bulls you know what, I would keep searching for other things. If you are relying on the starter for this diagnosis, it might not be right. eek

Stuart