Pair of marine 502’s came from a boat I bought for parts, run great! These look like they might have been summit 502 crate engines 425 HP, but I’m not totally sure. Just a good guess, blocks are gen 6. I have videos of them running, just mesaage me for them, I wa told around 5-10 hours some rebuilds then just sat 3 years due to hull issues, I don’t have any rebuild sheets or anything like that, but the oil is spotless and they run absolutely flawless, oil pressure 60-70 psi, these will come complete as seen in the pictures $12,000 for the pair picked up Olmstead Falls, Ohio as is. Great for drop ins or if you have a boat and need power if I sell seperate 6600.00 each. Ask any questions I will respond