I have been looking through the site and other places and really haven't found a solid answer to this question, so here goes.
I am planning on reusing my bolts throughout my new sbc 355, the original build was advertised at 140 HP and I know the entire history of the engine back to '73. So I know this is the first time the bolts have been touched. My machine shop and performance parts store (Sure some of you have heard of Dick Harrels on the drag strip...) recommend using the ARP moly grease. But because it is a higher performance lube than the 30 wt that the GM engineers set the torque values to, I am told to knock the torque values down 10 ft-lbs across the board. This does not entirely make sense to me, because there are vast ranges of torques for the various components...
So I log into the ARP web site and see what they have to say. I look up what seems to be an appropriate strength spec and compare the 30 wt to ARP moly grease torque values. They difer by a relatively consistent 33%. So I look up the fatory torque spec and set the wrench to the new value. 54 ft-lbs compared to the spec 70 ft-lbs. Put all my plastigage down just to check for good measure, but 54 pounds seems awful loose... And my journal clearances all appear to be at the upper limits.
So after all this, what can you all tell me about adjusting torque values based on the lubricant used?
(And yes I will consider buying the new bolts, but for now the old ones stay...)
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I am planning on reusing my bolts throughout my new sbc 355, the original build was advertised at 140 HP and I know the entire history of the engine back to '73. So I know this is the first time the bolts have been touched. My machine shop and performance parts store (Sure some of you have heard of Dick Harrels on the drag strip...) recommend using the ARP moly grease. But because it is a higher performance lube than the 30 wt that the GM engineers set the torque values to, I am told to knock the torque values down 10 ft-lbs across the board. This does not entirely make sense to me, because there are vast ranges of torques for the various components...
So I log into the ARP web site and see what they have to say. I look up what seems to be an appropriate strength spec and compare the 30 wt to ARP moly grease torque values. They difer by a relatively consistent 33%. So I look up the fatory torque spec and set the wrench to the new value. 54 ft-lbs compared to the spec 70 ft-lbs. Put all my plastigage down just to check for good measure, but 54 pounds seems awful loose... And my journal clearances all appear to be at the upper limits.
So after all this, what can you all tell me about adjusting torque values based on the lubricant used?
(And yes I will consider buying the new bolts, but for now the old ones stay...)
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