- Aug 22, 2004
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What kind of rpms can you safely get out of a stock block along with an Eagle 4340 crank and H beam rods I am thinking about changing my combination and want some input on how fast I can spin my 331 safely. Do any of you guys have experience here. I have been told a few things but dont know what to believe. I Have a friend that has a 347 carbed and he spins that thing to 7500. He has had it for 2yrs and it is still holding together. Thank you .