350 Chevy 4 bolt main. Good for a light rebuild. Drove this engine up until a week ago. Only reason I pulled it was #3 cylinder was using oil and I had a crate motor to replace it with. Sounded good, no knocks, no noises. Heads were rebuilt less than 5000 miles ago. No spun bearings, no cracks. Pictures were taken the day before listing, and it's not sitting out in the rain. We can load it for you.