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525SC Supercharger Stud nut Torque Value?

Old 02-11-2010 | 02:15 PM
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Default 525SC Supercharger Stud nut Torque Value?

Hey All,
Finishing up my top end rebuild and cant find a torque spec for the blower to manifold stud nuts. I keep hearing how critical the torque is on these nuts because of supercharger case distortion but am having my doubts. First of all they are nylock nuts which typically dont have a torque value and secondly there would be no way to get a modern torque wrench in there. Anyway as you can see Im arguing with myself so can anyone chime in please?
Thanks in advance!
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Old 02-11-2010 | 02:27 PM
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I will also need an answer for the same question on a Wieand 177 blower...Griff?????
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Old 02-11-2010 | 02:39 PM
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The 177 is sold through Holley. I remember finding the installation manual with torque specs on their website a few years ago.
Yep, still there, see page 3 for instruction:
http://www.holley.com/data/Products/...99R10244-1.pdf

Last edited by rdoactive; 02-11-2010 at 02:52 PM.
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Old 02-11-2010 | 02:57 PM
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Just Called Holley and they gave me the old 10-12 torque number. So I guess I'll go with that. Now if I can just figure how to get a torque wrench in there.....
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Old 02-11-2010 | 03:49 PM
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On my 250 blower it was 14. Key thing was to go slowly and many times around checking for binding. I had one builder recommend three threads of the bolt with Red loctite.
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Old 02-11-2010 | 04:45 PM
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It is 10 ft lbs. Make sure to use loctite, either red or blue otherwise they will come loose over time. Also be sure to occasionally check the middle intake manifold to head bolts.
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Old 02-11-2010 | 07:07 PM
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Pretty sure it was 12lbs in the Merc Manual I had. I think I ended up using a 1/4 inch socket adapter and wobble to get onto some of the nuts.
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Old 02-11-2010 | 07:36 PM
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12-15 foot lbs,its darn near imposible to get a torque wrench on them.start in the middle and work your way out in a circular pattern,dont use loctite red,blue is ok,but not needed if using a nut with the nynatron insert.check them every now and then.
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Old 02-11-2010 | 10:31 PM
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I have always used 10 ft lbs.
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Old 02-11-2010 | 10:53 PM
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10 lbs with loctight!,,and don't just torque them once,keep going over them seversl times..
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