Can you guys check this crank out for me

[baclay9]

I went ahead and pulled the bottom end of my 468 apart today with the help of a family friend. Wanted to have you guys check a couple f things out for me to maybe confirm some stuff.

First, it is a steel crank. I am not sure of the brand, he said it wasn't GM but I don't know. Also, everything I have read has said all 454's are externally balanced. But our family friend (who was a auto machinist for several years) is insisting this engine is internally balanced.

The crank does have places where material has beed removed (drilled out) and places that have had material welded in. Here are some pics of what I am talking about.

Here you can see where material has been drilled out toward the top of the visible lobe and where a kind of slug has been welded in toward the bottom. There is another slug welded in about the drilled out spot that you cant see in this pic.


By claypool782 at 2010-12-05

Here is a another place material has been removed

By claypool782 at 2010-12-05

It has also had the oiler holes kindof beveled. I am guessing for better oiling? As well as being double keyed on the front.

Here is a pic of the whole thing

By claypool782 at 2010-12-05

My question is, Has this thing been internally balanced? Thanks for any insight.

[cableguy0]

There has definately been mallory metal added. Its likely internally balanced. The quickest easiest way to know is to check and see if the weight is missing from the flywheel.

[baclay9]

The flywheel had a weight on it and it had what appeared to be a stock harmonic balancer. I am very confused by this.

[cableguy0]

Was it a running engine? If it had the weights and they shouldnt have been there the engine would literally shake like it was coming apart. If I were you I would have everything checked by a good machine shop. Have the rotating assembly balanced internally and be done with it. Its a good idea on any performance build. They last a lot longer

[baclay9]

It was a runnng engine and it ran great. No problems. It is going to the machine shop for a work over anyway. I just like to know a little bit going in so I don't have to be worried about them selling me a bunch of stuff I don't need.

[Marv D]

You still need to add / remove weight when you balance a externally balanced motor. The external weights are a 'fixed' item. You can't add to the scalloped harmonic damper, so balancing is still done at the crank. If you put a light weight small skirt piston , long rods in a externally balanced motor, the 'stock' crank balancing is off.

Now is this internal or external balanced motor..... them apper to be BIG slugs of mallory!!! But only one way to know. Weigh the parts up and have your machinist spin it up. Then you'll know for sure.