Mesa Balancing Racing Engines uses our seasoned blocks to build our non sleeved long blocks which as all of our engines are fully machined inhouse by our experienced staff as seen on our FB and IG page . All the components we use are forged and the highest quality for the application . Theses engines are suitable for 600-800 Hp levels. Please call our office for specifics on compression ratio and upgrades. We are experienced and specialized and can help you through the process of part selection. Long blocks do not include accessories but we can also provide those at an additional charge.