408 Crankshaft

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One that has a 4" stroke works well from what I hear.
 
I think it would depend on what kind of motor you want to build, street/race/or somewhere in between. A cast crank would work just fine for a street motor, and it would save you a lot of coin.
 
L4staero said:
If you use a cast crank DONT use an eagle. They break
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I concur. I built a pretty tame 408 and used a Eagle cast crank and 5000 miles later as I was driving home from a car show it developed a vibration. Have no idea how it stayed together coming home cause the crank was snapped right in half just behind the front main. I wouldn't use an Eagle cast crank in my lawnmower! Any of the others mentioned are decent. If you plan on going over 450 hp I'd suggest a forged crank just to be safe.
 
I used a forged eagle crank. Scat used to make the mopar performance. The problem with the cast crank is they're only good to 500 hp. With any performance build on a 408, you'll be close to that power level. I have a mild flat tappet hydraulic cam and untouched eddy heads. The motor thinks it's a big block but turns up like a small block. If you Google 408 build, you'll find ford guys having the same problem with cast crank 408 builds.
 
MP should still be made by Scat. Scat cast will go way past 500hp. Eagle cast, on the other hand, needs some careful machining and I'd still limit the output to under 450. I have a couple that are running in the 460-480 range but I wouldn't advise everyone do it unless you fully machine and internal balance the engine. Any forged are fine.
 
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