Safe max RPM for bone stock 5.9 magnum

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The speedmaster ports didn’t line up great. I filled the hole with right stuff and it’s been holding. Thankfully it didn’t leak into the engine. I finally found an edelbrock magnum intake from an unlikely source, my local oriellys!
In the meantime it’s still holding together after all kinds of abuse.

This is why I won't buy the knock off brands. By the time you spend money on fixing the imperfections you could've bought a name brand