The LT5 is built very strong physically, with the major external components being cast alloy. Machined edges meet each other and are either sealed with a liquid anaerobic sealer, an o-ring, or by a thin gasket which comes with a sealer already applied to it.


We have seen several areas of leakage becoming quite common. They include the oil pan gasket, oil pump pressure relief valve cover and front engine cover gasket. If you have a leak coming from the center of the engine, seemingly from the exhaust manifold, you might be correct. On some engines, the center studs for the exhaust manifolds are drilled into or nearly into an oil passage. Eventually, the oil works it's way through the stud's threads, causing a leak. Removal of the stud and the application of a sealer usually resolves this problem.

If oil is found around the spark plug, it usually means the internal o-ring sealing the plug tower has failed. This will be cause to remove the cam cover in order to replace the o-rings.

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