If the fact that you can't find any failure story's and chances are you will not get a failure rate on this thread but if you are still in fear then just buy a 4340... All people can do here is answer your questions but at some point you have to decide what to do with those answers.skinny z wrote: ↑Mon Mar 23, 2020 9:28 pmAt one time I was well connected with builders and racers. That all changed when I moved across the country. I'm kind of my own out here and am trying to find the right people to help me along.GARY C wrote: ↑Mon Mar 23, 2020 9:10 pm If you know any credible long standing dirt track engine builders then you will here plenty of broken crank stories that were virtually eliminated when they started using the 9000 crank, these would be 7000 ish 500 hp ish engines. At that point the main webs are probably weaker than the 9000 crank. RPM seems to be harder on cranks and rods then power and load.
I've paid attention the circle track guys and what works for them. But as was posted earlier the longevity is the concern for what I'm putting together. I've no interest in having to do a season ending tear down because I'm running components to the edge.
I will say I'm not building a rocket ship (my first post mentioned "another pedestrian 383 build" ) but at the same time I don't want to have to rebuild anything. Or worse.
The Interweb is not great for positive feed back but you can guarantee that every problem someone wants to bitch about is posted daily!