Take a look at this and see why clean threads and lubrication are essential on nuts and bolts. This is industrial grade stuff but still applies. Think about head bolts are you really achieving 40lbft when your torque wrench breaks out or is 10lbft being taken up by non lubricated bolts and dirty threads in block and bolts? 10lbft of torque lost will make the difference between achieving enough and even clamping of your head gasket and or wills rings.
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Look after yer nuts and bolts
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