Crank Balancer Options 1998 GT
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Old April 16th, 2013, 09:48 PM   #1
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Crank Balancer Options 1998 GT


A while back my crank balancer separated so I replaced it with one from Auto Zone. Now I'm leaking a little from the seal so I need to pull it apart and replace the seal. Since I need to pull it apart I was thinking about upgrading the balancer. I checked Summit Racing and they have a few that are reasonably priced but I noticed they have different diameters available. I didn't measure mine but they offer 6.610" and 6.870" diameters. I assume the bigger diameter will slow the accessories down just a little? I have a '98 GT with 4:10 gears, a Bama tune, exhaust and a C.A.I and my only future mods will be a P.I. head swap. I assume with only these mods a stock type balancer would be fine but I wondered if there were any opinions out there if it's worth changing it or not. I did do a search but didn't find what I was looking for......... Thanks!
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Old April 16th, 2013, 10:00 PM   #2
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Well if your gonna do the pulley do the march hydroboost crank pulley part # 1158
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Old April 17th, 2013, 05:48 AM   #3
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You could opt for the Steeda underdrive pulley set
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Old April 17th, 2013, 02:15 PM   #4
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Originally Posted by Tequilla View Post
I assume the bigger diameter will slow the accessories down just a little?
A smaller diameter dampener will slow (underdrive) the accessories. A larger diameter dampener would speed up (overdrive) the accessories. The stock diameter should be 6.75". Typical underdrive dampeners for these engines are right around 5".
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Old April 17th, 2013, 08:39 PM   #5
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I found the Marc #1158 at Summit Racing for $124.... Very reasonable. They don't list the diameter...... Is it stock, smaller or larger?
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Old April 18th, 2013, 08:40 AM   #6
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IIRC, the March #1158 is a 5" diameter dampener.
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Old April 18th, 2013, 09:41 AM   #7
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For the money a balancer would cost your going to get better performance by placing that money elsewhere in the car.
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Old April 18th, 2013, 10:26 PM   #8
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Originally Posted by Tang Stang View Post
IIRC, the March #1158 is a 5" diameter dampener.
Will a 5" dampener use the stock belt or do you need a smaller one?

Originally Posted by sharkbait View Post
For the money a balancer would cost your going to get better performance by placing that money elsewhere in the car.
Would a Trick Flow Plenum be worth more power than the dampener? They are close to the same price........
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Old April 19th, 2013, 08:30 AM   #9
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Originally Posted by Tequilla View Post
Will a 5" dampener use the stock belt or do you need a smaller one?
You'll need a shorter belt.
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Old April 22nd, 2013, 02:38 PM   #10
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If you plan on going FI anytime soon as in a Centri blower or twin screw then don't get an underdrive pulley!

Save yourself the time. I would actually get a bigger one if I was going FI like a 7.5
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