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17.1 at WOT or near redline (even crusing) is dangerous for an engine.
I was referring to under cruise conditions. If your final gear is at redline while cruising, then i don't suspect the engine would last long anyway. At near redline, low load is a condition where fuel economy isn't a main priority, all the same there still isn't enough air/fuel to cause temperatures to skyrocket. Running lean there isn't a big issue, the only case where it would be is if you have a very inefficient engine & it requires having the petal down quite a bit to maintain the rpm in which case it isn't a low load situation. I've usually pull around 18-20in. hg at high rpm, low load to maintain & i'm around 17-18 at idle.
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If you have to ask what it takes to get to 500 HP, you don't have what it takes to get there.
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