Leak Down Procedure (Pic Heavy)

It can also be used to check manifold leaks by pressurizing the intake. .

pressurizing the intake you would be able to check the condition of the valve guides and check if there was any leaks from cnc porting also?

..............Hmmmmmmmmmmmmmmmmm.......... Now there's one I had not thought of..........

Might be better, though, to come up with a vacuum tester rather than high pressure.. Not too sure the intake gaskets would reliably hold 100 psi, and certainly not something like the "bottom pan" design of the magnums.