oil feed fitting.
No its 1/8th NPT on the GT42
On the T76 it is 1/4 npt..
Its depends on which CHRA... I know on the T3/T4's we run in DSMs its all 1/8th NPT and the BIG garrets are all 1/4 NPT....
Incidently the hole for a 1/8th NPT is about 1/4" since NPT refers to the tubing diameter associated with the fitting not the fitings actual size.
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Like services cat, bobcat, case etc...
I did my whole car thru the same place I get stuff made for equipment and aircraft... Alot less $ than something like earls fittings too.
You need a 1/8 npt to 3 or 4 an adapter fitting and probably a 90.


