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Old 10-19-2010, 03:03 AM
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406 balancer& flywheel combo

A littlle guidance fellas. I have a 406 built short block and balanced,it was balanced with a flexplate and a stocktype looking harmonic balancer.
My dilema is, my car is a 4 speed,what combination of balancer and flywheel do i use,Ive heard my 350 balancer and flywheel combo from my 355 in the car right now can be zero balaced and used,or do I need a new flywheel and balancer combo for a 400, i dont mind spending the money,Just that I only spend it once and done right.

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Old 10-19-2010, 07:07 AM
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flywheel combo

Please ,guys,any help would be great before I commit,to something I'll rgret or break.
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Old 10-19-2010, 07:39 AM
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Did the 406 Balancer have a portion on rear of outer ring removed or smooth like a 350 Balancer?
If the 400 type HB was used it's externally balanced and will need a 400 external balance HB & external balance Flexplate.
If the HB was smooth like a 350 HB it was Internally balanced & you can a neutral HB & neutral balance Flexplate.

Last edited by SSedan64; 10-19-2010 at 07:47 AM.
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Old 10-19-2010, 08:20 AM
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SSedan64 is saying flexplate. I'm sure he means flywheel. The car is a 4-speed.
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Old 10-19-2010, 08:52 AM
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Quote:
Originally Posted by techinspector1
SSedan64 is saying flexplate. I'm sure he means flywheel. The car is a 4-speed.
Ooops, yes
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Old 10-19-2010, 04:11 PM
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406 balncing

I'll get back to you on the original HB to see if it was smoothed out during its original balancing. Thanks Guys
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Old 10-19-2010, 04:53 PM
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I felt like I missed something or possibly that Sapz28 did. No offence intended

Quote:
Originally Posted by sapsz28
I'll get back to you on the original HB to see if it was smoothed out during its original balancing. Thanks Guys
I'm not sure what z28 meant... Where is the HB it was balanced with and why would you consider replacing it? It would not have been modified during the balancing procedure.

Where is the flex-plate/flywheel which was used to balance the assembly? If it's an aftermarket, internal balance crank, then it would have a neutral balancer, which is technically a dampner rather than a balancer, and a flexplate or flywheel which is also neutral in balance. If so, and you did not supply the HB and flywheel, then some shops would use a perfectly neutral flex-plate and dampner which they keep for that purpose. But most shops agree it is best to run it with the parts used to do the balance..

And if it was done with a factory 400 crank (external balance type) and flexplate, then that plate has a weight on it..and factory type balancer wherever it is, is irregular looking.

I would try to contact the guy who did the balance work and ask him whether the crankshaft is external balance or neutral.
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Old 11-07-2010, 02:54 AM
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406 balancing

I have the dampner and flex plate that the motor was balanced with,it is the small one 6.75,and not sfi rated,as well I need a flywheeel not a flex plate,I want to put a either a professional products 8.00 inch sfi dampner with my fly wheel,or a sfi fluid dampner, and dont no if I need them both externally balanced since the crank is an externally balanced one or get them both neutral balanced,I will contact the machine shop that put it together and do what they reccomend.
Thank you fellas.
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Old 11-07-2010, 03:58 AM
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Stay away from Professional Products balancers, there are many problems being reported for them on some of the engine machinist web sites, including video of an SFI rated one coming apart on the dyno after only 40 seconds light use warm -up and then it comes apart in the first steady-state AFR check at 4000 rpm. They are not well thought of around the web.

Fluidampr is not well liked either, it is missapplied technology left over from stationary deisel engines, and some crank companies will refuse to warrantee a crank if it was used with a Fluid filled damper.

PowerBond, BHJ, Pioneer, Pro Race, Cyco, ATI, Innovators West, Romac, and the Summit SFI are all good, ATI and Innovators West are the best.

Go to an 8" if you can, tests have shown the larger they are the better they work and they make the most power and longevity. Small, light units are shown to be not as good, despite being lighter the car goes slower opposite of what a lot of people think. GM knew this when they put large 8" balancers on all their HiPo offerings like the 302/Z28, LT-1, LS6, L88, etc..

Last edited by ericnova72; 11-07-2010 at 04:03 AM.
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