Oil pump gasket?

[RonD]

Well....................if you use a thin cheap gasket and it deteriorates so a bolt loosens up....................

These are machined thick metal parts so don't warp or have uneven surfaces after disassembly
And they won't leak externally if they did leak a bit

Rocker assembly has an oil passage with no gasket as well, for the same reasons, its not needed, surfaces stay smooth and can't leak externally

 

[Uncle Gump]

I'm with Ron...

Two machined surfaces... if they didn't come with a gasket... don't use a gasket. Torque it properly and forget about it.

 

[AndyB.]

In automotive engineering, there’s a failure mode effects analysis process. You have a piece of gasket paper holding back 60 psi of oil pressure. What are the effects of that failing and leaking? Reduction in oil pressure? If we have a soft oil pump body that deforms on installation and makes its own sealing surface, how will that fail and what is the effect of that failure?