97stanger

within the next weeks I will be buying my forged rotating assembly. I am shooting for 550-600rwhp THROUGH MY BUILT AUTO. Do you guys think I should forge my crank, or could I save some bucks and just get the forged rods/pistons? its just tempting to reuse my crank that has only 48k original miles and looks like this:

lizzyfan

I mean you hear all the time that the stock iron crank is stronger than it's rated but personally if you are gonna push those numbers I'd do the forged crank just for piece of mind!

Sxynerd

You know my opinion. :0) Casts are under rated.

97stanger

I'm seriously thinking about just keeping my stock one....gotta think about this

lizzyfan

Up to you Bro

Mustang_NTriangle

I have never heard of a crank failing.

Sxynerd

Your SI blower will be maxed out a lot earlier than that crank is going to have issues.

Heck even MMR will tell you that their MMR600 (w/ GT crank) will spin to 8k rpm. As long as it's balanced you will not have an issue with it.

99mustanggt

I beleive the cast crank will be fine.I've never seen or heard of a stock 4.6 crank failing.It should hold 600 with no problem.

97stanger

yeah, i have decided I'm going to just get my crank polished and keep it. Definately getting the internals balanced. I'm looking at this kit, what ya think:

http://www.cushmanmotorsports.com/in...fe9a780df92772

BraMas

Good call on keeping your cast. One of the trends for 4V guys that want to stay NA is to swap in a Cast crank because the forged one weighs so much more.
I will never understand why Ford thought they needed a forged crank in the 4V