016 4.1 block

[Crazyx4]

the two oil feed holes that are in block near the intake.one in the front and one in the back. it looks like 1/2" pipe but i'm not sure my plugs are fitting correctly. if anyone knows what thread they are i would be thankful. this stage thing has been a headache

 

[forcefed3.8's]

Should be 1/2 npt.

 

[Crazyx4]

thanks