I have a question about balancing, I am building my 427 drag race motor and am wanting to know if the machine shop will have to add Mallory metal to my crank, because, the Eagle H-beam rods and Sealed Power powerforged piston combo I am using is a lot lighter than the stock rod and piston combination? I know most machine shops could answer this question, but I am just curious. I have not taken it in to a machine shop yet other than to have the block bored and the crank polished. Thanks for any help. Bill napa219

If your new stuff is lighter, they should only have to remove weight from the crank, not add any.

Will in fact any metal need to be removed? It is an internally ballanced engine. When I take the crank in to be balanced do I need to have the flexplate and balancer along with it? And should I assemble the pistons and rods?

I recently had my 427 combo balanced, it was a 6223 crank ,eagle I beams,and trw domed pistons(heavy suckers). THE Balance company had ZERO problems.BUT they did weld some additional metal on the throws.
When you get it balanced they need all the parts (inc the flex,and balancer) even if it is internal . The parts should all be seperated.They balance the rods,pistons etc seperatly.They then get a fixed bobweight(total weight of a complete rod,piston assembly) for balancing the crank.

Yes, its likely they'll need to remove some. They'll need one complete piston rod set. If you wnated you could weigh all 8 of the sets and get them to the lightest weight of the set by dusting off the pads on the rods. Then all 8 will be identical ) I wouldnt worry about rings), adn they can use one.

i recently had mine 427 balanced and went with lighter pistons.They removed weight from the crank.

If you are paying for a complete balance job, you need to take all 8 pistons and rods. They should match them to within whatever specs they tell you. 2 grams is probably ok, but less than 1 gram is better.;) And like has been said, if your new stuff is lighter than the stock stuff, they will remove weight from the crank.

Will in fact any metal need to be removed? It is an internally ballanced engine. When I take the crank in to be balanced do I need to have the flexplate and balancer along with it? And should I assemble the pistons and rods?
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Jay pretty well covered it :thumbsup:

But, you are asking some questions that cannot be answered until you balance the thing.

No, do not assemble anything
Each piston needs to be weighed & matched as well as possible without sacrificing strength.
Each rod needs to be weighed at each end & matched.
And yes, I am aware the box says they are done but check anyway, most can stand a little fine tuning ;)

Yes, the damper & flexplate can be checked so take them too but if new SFI stuff as it should be I have yet to see a quality one off enough to spit unless some dummy has altered them.
The cheap "Ebay" crap SFI stuff does not count here :sad:

As has been stated, if you have lighter parts you should only need metal removed not added to the crank.
Question is how do you know the parts are lighter??

But I would be extremely surprised if you needed Tungsten in a 427 ;)

And your rotating assembly should be balanced w/o removing OR adding any metal to or from the damper and flexplate/flywheel too!

This way those parts will still be stock balanced and can be used on other stock type engines w/o having to re-balance everything just like stock.

pdq67

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Jay pretty well covered it :thumbsup:
Question is how do you know the parts are lighter??

But I would be extremely surprised if you needed Tungsten in a 427 ;)

I weighed all the individual pieces on a postal scale and add them up. I also weighed the stock rod and piston combo. And the new ones are about 20 grams lighter. Thanks for all the help! Bill. napa219