Jd 619 crank November 24, 2019 02:57PM
I was wondering if anybody could pointe in the correct direction. How many rpms and hp can a big block jd 619 crank handle with out breaking? It would be 619 cubic inch on alcohol, aluminum rods. Are they dependable at 6000 rpm and 2500- 3000hp

Re: Jd 619 crank November 25, 2019 11:18AM
No stock crank can turn 6000 RPM without some serious work for balance at that RPM---maybe not even with extensive work to balance the rotating assembly. Buy a billet and be done with it.

Re: Jd 619 crank November 25, 2019 11:28AM
Forged is stronger than billet. A good forged crank with properly welded counter weights is cheaper and stronger. Everyone loves billet but forging has a much more optimal grain structure to give it more strength.

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