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  #31  
Old 06-22-2009, 07:09 PM
Merk Merk is offline
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by jcrews
Merk
I've actually had the grade 8 bolts stretch that is why I started buying grade 9 bolts from Fastenal. They are expensive but I have no problems with the grade 9 bolts www.fastenal.com
It sounds like you are having other problems if you have the need for grade 9 bolts. I'm using Kohler head bolts and not having problems. The one Kohler that has studs is a highly modified motor.
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  #32  
Old 06-22-2009, 07:28 PM
FrankenCub FrankenCub is offline
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I don't see a need for grade 9 bolts either. With the pressures a Kohler is seeing in the combustion chamber I don't really understand the need for allowing stretch as a safety measure. I have seen where it is a built in safety feature to save the engine but that is where there is substantial pressures like a super charger or turbo so the intake will blow off before making the insides loosely fit into a grocery bag. I do think the banging is due to idle being a little high and maybe running a little lean. Is your throttle shaft loose by chance ? That can make your idle high and lean.
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  #33  
Old 06-22-2009, 09:41 PM
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jcrews jcrews is offline
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It sounds like you are having other problems if you have the need for grade 9 bolts. I'm using Kohler head bolts and not having problems. The one Kohler that has studs is a highly modified motor.
I'm just saying I've had no trouble since I started using them over 2 years ago
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  #34  
Old 06-22-2009, 10:06 PM
Merk Merk is offline
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My 149 has .030 off the head. That was done 5 years ago when the motor was rebuilt. I'm still using the same head gasket and Kohler replacement bolts.
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  #35  
Old 06-22-2009, 11:42 PM
Tom S Tom S is offline
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Do some searching and read some articles on torque and stretch. Torque is really just a way to measure the stretch. There are charts out there that show the torque values for different grades of fasteners. A grade 8 should not be tightened as much as a grade 5 to provide the same force. There is a lot of info out there on torque vs. stretch. I'm no expert, just putting in my 2 cents.
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