MineralGreyGT joined the forum a couple of months before I did. There were a lot of people who joined the forum who believed you could get 500 rwhp on a stock short block with a supercharger. Some thought you could get it on a stock motor. Just turn up the boost. They would post links to cars that were doing it. So they went 12-13-14 psi and bragged about 430-440 rwhp (SAE). And, a few months later they were rebuilding motors. At the time ProCharger recommended a maximum of 12 psi on Windsors and 8 psi on Romeos. This is probably because of the different compression ratios.
It was very tempting. All it takes is changing a pulley. Every 1/10th inch smaller pulley is 10 more psi (ProCharger P1SC). I almost did it. But I wasn't building a race car just a quick daily driver. My P1SC has been running at 9 psi for almost 12 years (130,000 miles). The stock motor now has 210,000 miles on it and its still running strong. They say these motors have gone over 300,000 in taxis. I hope so.
There were a few who were in the 500whp and never blew up, at least to my knowledge. The guy who tunes my car told me he's seen plenty of 2V guys at 525whp with no known issues, he has seen a lot of 3v motors fail, I guess the block warps or some kind of catastrophic failure according to him. I am not nice to my car, it does not get babied what so ever, i'm constantly bouncing off the rev limiter when racing to keep speed up at a corner etc. I think there are a lot of factors that allows these engines to live in these regions of power.
1.) the cam i am running i think helps relief some pressure, i am still running the stock 3.33 pulley but by running a really efficient intercooler and getting rid of my power pipe I went from 9-10 psi to 11-12 psi. Also the fact that I have a really good intercooler keep IATs down.
2.) I try to never lug the engine that puts a ton of stress on the internals, I keep her revving happy and free
3.) I am adamant about oil changes and I always use the best stuff possible, going to install Puroil in her soon which will also keep temps down, should also give me a little power bump, they have seen 12whp on a NA racing Honda if I recall.
and from what I have seen 2v taxis get run nearly to 500k miles and when they disassemble them the cross hatches on the bores are still visible, ford did an amazing job with these engines, very reliable.