Crankshaft selection for a small block mopar 340
 

Hey everyone.. Im lookin for crankshaft ideas for a 340 with the stock stroke (3.31). I already have rods and custom pistons so a stroker motor is out of the question... This is for a bracket car so it doesn't have to be exotic. Just needs to stay together lol. Thanks in advance

Re: Crankshaft selection for a small block mopar 340
 

It depends on the power and rpm level you will be running. On the low end, there are the factory cast nodular iron cranks, factory steel cranks (340 and also 318 and 273), then the aftermarket cranks, forged and billet. The factory forged 273 and 318 cranks don't have the holes drilled in the end rod journals like the 340 crank does. They had lighter rods and pistons, so I guess they left out drilling out the crank. I have a 1967 273 crank out of my Dart. They have a smaller torque converter register on the flange. So, if you go with a stock forged crank, I'd stick with 1968 and later if you are running an automatic.

Re: Crankshaft selection for a small block mopar 340
 

68-72 340 steel crank will do it. 73's are cast and will be more $$$ to balance etc. Made sure it's not cracked and it's strait.
318 crank's are a different weight, a steel one will work, but will need some balance work.
There are some aftermarket ones out there, Eagle comes to mind, I'm not sure how they would be for a racing application.

Re: Crankshaft selection for a small block mopar 340
 

I've been looking at an eagle cranks. Anyone use a eagle cast crank? Car makes about 450hp or so

Re: Crankshaft selection for a small block mopar 340
 

Yo Sam sent u a PM

Re: Crankshaft selection for a small block mopar 340
 

Hmmm I didn't get it. Or I can't find it lol. Maybe both

Re: Crankshaft selection for a small block mopar 340
 

If you use an Eagle crankshaft, make sure to have it checked thoroughly by a reputable machine shop.
My preference would be as suggested, OEM steel crankshaft or Scat.

Re: Crankshaft selection for a small block mopar 340
 

Sam, I put a stock cast crank (new) that was cryo'd in Chuck Beach's 340. It runs pretty good.-JB-

Re: Crankshaft selection for a small block mopar 340
 

Any Production Mopar Crank will do fine at 450HP!
We run aftermarket cast crank in our 360 stocker
as we like radius rod billets.

You did not give up on you stocker I hope!

Re: Crankshaft selection for a small block mopar 340
 

Haha nope not yet at least lol. I believe we are going to go that route. Mopar cast crank. Gtxjohn I'll be sending you a pm shortly