You’re not really getting a reliable 600 hp cheaply. The problem is the aftermarket blocks are not cheap and difficult to find. You will get better ring seal and the fifth head bolt.
Yes, it looks like over 4 grand for a strong after market block. However, I doubt I will do more than a couple of days a year at the track. The rest of the time I will be cruising around town at 400 hp without nitrous.
