I've had the head off the 850, and after re install and a couple of short runs, i find fluid seeping from head gasket.
I installed a monotorque gasket, tightened the head in proper sequence, have re tensioned the head in proper sequence. My assumptions are, there may be some dirt on gasket or may have a warped head. When i take the head off, can i clean and re use head gasket?
Any other possible senarios?
Suggestions appreciated. Thanks Anthony.

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Head gaskets are a single use item, once you squish em thats it (Like snails ). Thats just my opinion any way

monotorque does mean torque once, so you shouldn't need to retension, and no, you won't be able to re-use the gasket

the head and block should be clean enough to eat off - there shouldn't be any doubt about whether or not there was dirt on the gasket. Did you take the head off for a particular reason? did it overheat?

also, how well do you trust your torque wrench - if it's a supercheap etc. brand then the actual torque may be way off

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My engine builder told me to run it around a little bit on water before you use coolant as it can find its way into bores,oil galleries before gasket seals up properly