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probably the crank seal that the balancer runs against to keep the oil in the motor. you will have to pull the balancer off then pry the seal out and tap the new one into the timing cover. take a look to make sure as it could be the oil pan gasket. clean area and run car until you see oil coming out.
The front crank seal is behind the oil pump on the LS series motors. There is also a seal at the crankshaft and harmonic balancer on the front timing cover. This is typical leak area. You can carefully remove the harmonic balancer with a puller, replace the timing cover seal and reinstall. Make sure not to pinch the seal lip You will have to have a special tool in order to re-install the balancer, which is extra long to squeeze it on the tapered shaft. I do not think the other crank seal is an issue since it drains to the pan behind the oil pump.
Front crank shaft oil seal is located behind the crank shaft pulley (A.K.A. the harmonic balancer). If you look from under the car at the bottom pulley on the engine. It will be very wet and oily. This is not an easy job to replace the seal for the inexperienced.