The factory lifters have the larger oil port also, that has been a running change.
Yes Mitsubishi lifters are to be bled out with fuel oil when installed.
Why do people complain about ticking lifters then to change them and install new ones dry again.

Cheers, Charlie
If It ain't broke, Modify it!
87 Montero turbo Converted back in Spring1989
95 Montero SR 3.8 DOHC Only one?
93 Pajero 3 door 6G75 Mivec with paddle shifted 5 speed
Then a Gen2 SR with full coil independent suspension.