Just the flash. No water leaks

this happened twice? looks like a good case of OOPS NOT INCONEL... to me.....

12.5 hours mainly cruise time in an n/a motor they could have been ss and should've lived through that

Build sheet says inconel and I insisted on inconel.

hmmm that's odd, would have had to stick in guide then I would think, Inconel don't break unless that happens, I had one so hot it started to tulip so bad it cracked, still didn't break off...

However, more people have f*ked up A/F ratio issues at cruise than they do idle and WOT. Many meltdowns happen while 'cruising.'

Good point,

Do you run a cross over? IMO 100* of water temp is not enough. I also think you should have water lines from the front to back on the intake manifold.

I run crossovers no stats, no water line to back, never been issue, been that way 10 years...

loose clearances are a MUST in that case though...

Yep! When I had my engine run on the dyno I asked them to put a load on it and run it with a steady state test from 3500 RPM to 4500 RPM. I wanted to make sure we had good A/F numbers in that range, and also wanted to ensure that there would be no oil drainback issues with valley screens installed. While running this way, we saw it go pretty lean and the headers began to glow. If I had simply dropped it in the boat and run it after making several quick pulls on the dyno for WOT power data, I am 100% sure I would have likely melted it down at a fast 4200 RPM cruise.