[A26B]

Originally Posted by KJL

........ That would leave the the only other source being the injector housing to head connection. This area is wet and I was hoping the oil was coming from else where. It still strikes me as odd with this being the intake, this area should be in vacuum.

There are passages in injector housing/cylinder head interface for;
vacuum: air & fuel, intake
pressure: coolant
pressure or vacuum; oil, crankcase ventilation, depending on operating condition.

Bolt loosening develops over time as a result of gasket compressibility and rebound characteristics. Bolts get loosen from vibration and differential thermal expansion and is exacerbated when gaskets lose rebound. Thread locker helps to prevent bolt loosening.

GM recommends both medium (242) & high (262) strength Loctite for use in the LT5. Loctite developed #243, a medium strength (blue) compound that has a higher gel strength and works better on oily threads than 242. I recommend Loctite 243 for use on the Crankcase Ventilation Cover and Injector Housing bolts.

Although removing the bolts & properly reinstalling with Loctite 242 or 243 will generally solve the problem, new gaskets will help to insure complete sealing, especially where the Injector Housing/Cylinder Head inteface is concerned. There is portential for gasket deterioration that can result in vacuum leaks, and coolant leaks that can go undetected but inhibit performance.

We do stock 10ml Loctite 243 as well as 242, 262 & 565.