The engine was removed from a 63 or 64 Chevy pickup.I believe it was the orig. engine. I have not checked to see if it is small or large journal. Being that old I would think it should be small. I don't believe the large journal came out until 68 or so. 383 strokers are very nice engines but I want something different. Around here it seems the 383 is under every Chevy now. But if that is the way to go that is what I need to do.But I would rather build a 327 you know.