drain back

[Tim Hensley]

my NA block i need to tap Is it 1/2 pipe or 3/8 pipe

[Tim Hensley]

And should I tap the lifter oil feed lines or stay with the expansion plugs?

[earlbrown]

I/2" NPT on the oil drain. and I like tapping the galley plugs...    BUT be careful on the passenger side with the tap, don't go as deep as much as you think you need to.

After going about 1/2 as much as you think you need to, test fit the plug.  If it goes too deep, you'll cut off the oil supply to everything but the turbo (and pressure gauge if you have one)

[Tim Hensley]

Thanks