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Old 02-17-2008, 03:58 PM
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Help identify my balancer!! PICS

Hey guys so I have been looking for an internally balanced harmonic balancer for my 383 SBC that has already been INTERNALLY BALANCED. A friend of mine gave me this one that he had no use for and said it came off of a 1977 350 block (forget what car it was). So I went to pick it up from him today and it looks to me to be an externally balanced dampner!! I always thought that all 350's were internally balanced!! Anyways I measured it and it is 8 inches in diameter and I took some pics as well so if anyone could help identify if I can use this balancer on my engine or not it would be very much appreciated. It also has 2 small drill holes on the outer shell (included in pics). Please help me, Keith.

http://img.photobucket.com/albums/v7...n/IMG_4607.jpg
http://img.photobucket.com/albums/v7...n/IMG_4608.jpg
http://img.photobucket.com/albums/v7...n/IMG_4609.jpg

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Old 02-17-2008, 04:03 PM
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Quote:
Originally Posted by sexypizzaman
Hey guys so I have been looking for an internally balanced harmonic balancer for my 383 SBC that has already been INTERNALLY BALANCED. A friend of mine gave me this one that he had no use for and said it came off of a 1977 350 block (forget what car it was). So I went to pick it up from him today and it looks to me to be an externally balanced dampner!! I always thought that all 350's were internally balanced!! Anyways I measured it and it is 8 inches in diameter and I took some pics as well so if anyone could help identify if I can use this balancer on my engine or not it would be very much appreciated. It also has 2 small drill holes on the outer shell (included in pics). Please help me, Keith.

http://img.photobucket.com/albums/v7...n/IMG_4607.jpg
http://img.photobucket.com/albums/v7...n/IMG_4608.jpg
http://img.photobucket.com/albums/v7...n/IMG_4609.jpg
All 350 Chevys are internally balance. If there are no scallooped out area or any other oddity that would seem to make it out-of-balance, that is an internally balanced piece. The drill holes are from the factory getting it to within their tolerances.

tom
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Old 02-17-2008, 04:21 PM
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but does it matter that it is an 8" balancer opposed to the 6 and 3/4" or 7" balancer?? Wouldn't this balancer be heavier since it is 8 inches and wouldn't this make a big difference??
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Old 02-17-2008, 05:29 PM
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Quote:
Originally Posted by sexypizzaman
but does it matter that it is an 8" balancer opposed to the 6 and 3/4" or 7" balancer?? Wouldn't this balancer be heavier since it is 8 inches and wouldn't this make a big difference??
It is a little more capable of absorbing torsional vibrations that a smaller one. But then again some think the larger balancer stores the energy from the vibrations and can actually increase the extent of the crank twisting.......

A smaller balancer takes less HP to spin up. But others claim a HP increase with a larger balancer.

Hard choice ain't it?

The quality of a balancer certainly makes a difference. Stay away from Professional Products balancers (unless you are a fan of hand grenades). Romac makes a good, mid-priced balancer, ATI is the top choice of many professionals.

tom
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Old 02-17-2008, 06:38 PM
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So it doesn't mean my engine needs to be rebalanced now does it?? I bought the assembly pre-balanced internally before it was shipped. They did not include the harmonic balancer nor flexplate so I am assuming I just use a neutral dampener and flexplate (off of a 350). Now that I know this will work for my application I will use it, there isn't anything wrong with the stock GM balancers is there??
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Old 02-17-2008, 06:51 PM
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The 8" 350 balancers were usually found on 4bolt main motors. It should work fine for your application if you don't plan on spinning it over 6500. Take a good look at the elastomer and make sure there's no cracks or swelling. Motor oil over time can make them swell and soften and age can make them crack like dry rotted tires. I agree-don't use a Professional Products dampner, we tried one on my Son's 327 and the ring came off on the first 7K powershift.
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Old 02-17-2008, 07:06 PM
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http://img.photobucket.com/albums/v7...n/IMG_4611.jpg
http://img.photobucket.com/albums/v7...n/IMG_4612.jpg
http://img.photobucket.com/albums/v7...n/IMG_4613.jpg

Here are some pics of the back of it. I was told that the 400 balancers have that recess found in the outer ring on the rear. Mine has that recess. Does this actually look like a 350 internal balancer 100% for sure?? That recess is making me wonder. Please help.
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Old 02-17-2008, 07:33 PM
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That is without a doubt a neutral damper.
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Old 02-17-2008, 09:49 PM
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That looks like a 305 balancer. It is for internally balanced engines, just lighter than a 350 balancer.
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Old 02-17-2008, 10:24 PM
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Quote:
Originally Posted by MI2600
That looks like a 305 balancer. It is for internally balanced engines, just lighter than a 350 balancer.
I agree I thought the 350 balancer has a counter weight on the inside. This one does not.
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