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Old 04-29-2006, 05:46 PM
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383 Balance Question

I want to get my 383 balanced. I know the pieces needed are the crank, pistons, rods, flywheel and harmonic balancer. What kind of harmonic balancer do I need to buy and what flywheel do I need? I am using a cast stroker eagle crank. I don't know if the harmonic balancer I need is external or internal and if I need one for a 350 or 400 and is an 8 inch balancer sufficient? Are there differences for flywheels for a 350 vs a 400? Also, the car it is going into has a muncie 4spd and has a 350 in it, will I be able to use the transmission still in my 71 nova if I need a 400 flywheel (assuming the flywheels are different), I know I will need a new sized clutch if a new flywheel is needed (I already planned on replacing the clutch since i was there).

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Old 04-29-2006, 06:19 PM
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First you will need to know which model crank you have. Internal or external balance. The manufacturer or dealer will have that info.

If it is an external balance crank you will need a 400 harmonic balancer. They are different than other sbc balancers as they are counterweighted. Same goes for flywheel. Get the size that will fit your application. Most 400's used the larger flywheel. Or you can use a 454 flywheel, as you are getting the assembly balanced..
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Old 04-29-2006, 06:24 PM
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It will all depend on if the crank is meant to be internally or externally balanced.Looking at what they have in the cast steel I only see external balanced cranks.You will need a external balancer and flywheel the stock one will not work. You will also need to give a rod bearing and your rings to get a good balance
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Old 04-29-2006, 06:59 PM
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Most 400 cranks are external balance,and any 400 balancer should work,and the fly wheel I would buy a new one for a 400 small block external balance.I would file fit all the rings and install on the pistons so the weight want change with the rings,and you could probably do it your self if you have something that weighs in grams,every thing except for the crank.
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Old 04-29-2006, 07:09 PM
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I'm an idiot.....On the receipt itself it says "ext balance" I'm taking that means external balance and a 3.75" stroke for the 383 is a 400 crank and the 400's are external balanced, so I need a 400 ext balancer!! and a 400 flywheel. I will still be able to use this in my origional transmission correct?
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Old 04-29-2006, 08:02 PM
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External/Internal balancing

You might jump over here and read this. It might help. Post # 20.
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Old 04-29-2006, 10:14 PM
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Quote:
Originally Posted by crusherdbuzz
I'm an idiot.....On the receipt itself it says "ext balance" I'm taking that means external balance and a 3.75" stroke for the 383 is a 400 crank and the 400's are external balanced, so I need a 400 ext balancer!! and a 400 flywheel. I will still be able to use this in my origional transmission correct?
Shouldn't make any trans difference. Trans bolts to the flexplate/flywheel.
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Old 04-29-2006, 11:04 PM
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Flywheel for standard trany, Flex plate for auto.
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