[Choda]

Wasnt the pump. Appears as though I am having sealing issues with the intake and heads. I noticed some misty oil residue around the intake runners. I also was thinking the problem over in my head and trouble shooting.

It was fine on the dyno.
I changed nothing.
All of a sudden lean when under load/boost.
The IAT DROPS just after I let out of the throttle.
Test button on the meth is working as expected.
Complete Meth system looks good.
Seems a little down on boost even if I wasn't holding it WOT through gears.
Oil residue around the intake runners.

hmmm. Under load/boost, its leaking at the gaskets causing the meth to not enter the combustion chamber, not make expected boost and be LEAN. Once I let off the gasket reseal and that's why the IAT DROPs hard. Only reason there is oil in the intake manifold is if the rocker bolts holes in the intake runners are allowing oil past. Which also has me thinking if I used RTV on the rocker bolts that go into the intake runners or not. I think I did but not 100% positive.

I ordered all new gaskets and will remove the rockers and bolts to RTV them. Should be a saturday of work to test my theory.

If you guys remember my back and forth with Katech about machining these LT4 heads to work with my LT1 manifold. They originally said there could be sealing issues but later confirmed it should be fine.

Would you guys put the new intake gaskets on dry like normal and torque the manifold down or a light coating of RTV on the gasket?