How do I internal balance a 400 SB Chev? - Hot Rod Forum : Hotrodders Bulletin Board
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Old 12-04-2002, 04:30 AM
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Post How do I internal balance a 400 SB Chev?

I need to use a 350-153 tooth flywheel as this is the motor I am replacing with the 406.

I am aware that you need to match all of the pistons & rods etc to @ 1 gram but how do you match up the crank / flywheeel etc? <img src="confused.gif" border="0">

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Old 12-04-2002, 04:39 AM
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The engine will have to be balanced at a machine shop. They have to add heavy metal to the crank counterweights. Also, dontt forget to use an internal balance damperr if you have the crank internal balanced.
Chris
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Old 12-04-2002, 07:22 AM
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Buy a scat or Eagle crank that will balance internally. Expensive to have Mallory metal added to your crank. A new crank is not that much.

Buy the new crank and balancer for a 350.

Keep your crank, balancer and flywheel for a different engine.
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Old 12-04-2002, 11:48 AM
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I already have a 509 casting block and a std. 400 crank from the smae motor.

Do they internally balance the crank, flywheel and damper as one piece, while its in the motor is that how its done?

I mean the rods and pistons can be balanced outside of the motor but I know they use a "bob" for balancing.
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Old 12-04-2002, 05:01 PM
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if you are doing an internal balance job the flywheel and balancer are usually balanced to "0" seperately. only with external balance are they all done together. don't worry about the stock 400 crank and its external balance they work very well , its only when you start turning 6500 up constantly that you have problems,but then you will have problems with any cast crank at those speeds.
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