Correct balance weight

289 - 351 cid Small Block Performance
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smithhe
Posts: 117
Joined: Mon Jun 18, 2018 1:22 pm
Location: Southern Maryland

Correct balance weight

Post by smithhe »

Hello, I am building a 347 for my comet and I am wondering if the stock 289 was externally or internally balanced from the factory, the new 347 in building needs a 28oz external balance and if the stock 289 used the same then I can use the same harmonic balancer on the new engine, thank you.
1964 Mercury Comet 404 with 347 stroker
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poboyjo65
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Joined: Thu Oct 20, 2011 8:40 pm
Location: Camden, Tenn.

Re: Correct balance weight

Post by poboyjo65 »

yea you can use your old balancer. but it's a good idea to get a new one. I bought my 347 stroker in a kit, came with its own balancer & flexplate (28oz), & is what it was balanced with , & tested up to 10,000g rpm, so I wanted to stay with that one . usually they have both 3 & 4 pulley bolt hole patterns.
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Johno
215-60-15 on 7x15's .... 29-15-15 on 10x15's

smithhe
Posts: 117
Joined: Mon Jun 18, 2018 1:22 pm
Location: Southern Maryland

Re: Correct balance weight

Post by smithhe »

poboyjo65 wrote:yea you can use your old balancer. but it's a good idea to get a new one. I bought my 347 stroker in a kit, came with its own balancer & flexplate (28oz), & is what it was balanced with , & tested up to 10,000g rpm, so I wanted to stay with that one . usually they have both 3 & 4 pulley bolt hole patterns.
Thanks for the response! I bought the engine from a friend of mine and it’s basically a short block and it didn’t come with a balancer so I’m trying to use whatever I can from my old engine to save as much money as possible.
1964 Mercury Comet 404 with 347 stroker
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poboyjo65
Posts: 6000
Joined: Thu Oct 20, 2011 8:40 pm
Location: Camden, Tenn.

Re: Correct balance weight

Post by poboyjo65 »

as long as it is 1980 & earlier. after 1980 or so they went to a 50oz balancer & flywheel.
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Johno
215-60-15 on 7x15's .... 29-15-15 on 10x15's

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