This is the boogieman for my application: From the research I have done the only problem(s) with these engines is the water pump system will weep because the cam seal will fail, the alternator sucks and if you over heat it with the iron head it will leak the head gasket. So in stock form if you solve the first two issues that leaves the head sealing issue if it overheats. Decking filling or block reinforcement could be a death-nail to my build. I will be running this thing for up to 24 hours strait. When you consider closed course road racing you are essentially running two drag races per lap down the front and rear stretches. We can easily run 450-650 laps per race. That is 1000 hard pulls per race. My boogieman is if I screw with the water jackets and cause hot spots in the cylinders or restrict the general cooling capacity I might be throwing well over a 1000.00 in other block machining tricks in the trash. My build is about freeing up frictional horsepower rather than increasing the RPM it was tested and designed for. Yes, I will be slightly increasing cylinder pressures but I want to do this at the designed piston speeds and with great reluctance on the turbo side of things... I'm getting closer and closer to just copper o-ringing the head and EPDM o-ringing the block with the stock cylinders. But at this point and time... I'm in the realm of listening to the most experienced 470 guy on this forum and just running the FACTORY head gasket. Whom made lots of power and reliability with that setup and went 186mph. lol.