04 Pontiac Grand Prix Valve cover leak? or intake manifold leak?

I was hoping someone could help me identify this problem i have. Antifreeze leaks to the top of the engine but the oil looks fine. Can anyone give me advice on this video?? It has over 250000 miles on it but has not lost any power since the day i bought it new.

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GM 3.8 Intake Manifold replacement. Removal the fast way WITH NOTES
this is the "Flat Rate " way to do a 3.8 liter upper and lower intake manifold set. as you see it is not necessary to take off he serp belt, alternator or tensioner assembly to remove the lower manifold. I recomend having someone help when it is time to reinstall the manifold because it can be tricky to lien up the coolant elbow and not mess up the lower gaskets when reinstalling. Note that it is recomended to disconnect the negative battery cable when doing any major repairs. This video is just to show some guys that said that a lower manifold cant be pulled in way less than 20 minutes, I know that I went over that , but I had some stuborn injectors and Im a little out of practice. If you are going to do this yourself and you are not a professional I recomend that you follow the procedure in a service manual

How To Replace The Head Gasket and Intake Manifold Gaskets On A GM 3800 Engine
In this walkthrough I replace the head gaskets, upper intake manifold (UIM) gaskets, and lower intake manifold (LIM) gaskets on a 1997 pontiac bonneville. These steps will be identical for almost any GM 3800 / 3400 / 3100 series II motor. If you have any questions feel free to post them on the video and I'll do my best to try to help! Here is a link to the the text walkthrough I used as a guide for making this video: http://www.w-body.com/showthread.php/49858-Any-info-on-changing-series-2-38 00-head-gaskets Also here's a list of torque specs for most of the motor: Camshaft Bolt: 74 ft/lbs + 90 degrees angle torque Camshaft thrust plate: 132 in/lbs (T30 torx) Front cover bolts: 15 ft/lbs + 40 degrees angle torque Oil pan bolts: 125 in/lbs Crank sensor nuts: 18 ft/lbs Camshaft sensor bolts 48 in/lbs Lifter hold-downs: 22 ft/lbs Rocker bolts: 11 ft/lbs(132in/lbs) + 90 degrees angle torque Lower intake bolts: 132 in/lbs Supercharger bolts: 17ft/lbs Crank Bolt: 111 ft/lbs + 76 degrees angle torque up to 10/98 111 ft/lbs +114 degrees angle torque 10/98 and up Cylinder head bolts: 37 ft/lbs + 130 degrees + 30 degrees up to 10/98 37 ft/lbs + 120 degrees Flywheel/flexplate bolts: 132 in/lbs + 50 degrees Exhaust manifolds: stud/nuts 132 in/lbs Nuts 156 in/lbs Oil filter adapter to timing cover: 22 ft/lbs 97 earlier 132 in/lbs + 50 degrees 97 and later Oil pump Cover to timing cover: 98 in/lbs Pick up tube and screen: 132 in/lbs Valve cover bolts: 89 in/lbs Tstat bolts: 21 ft/lbs Water Pump: 132 in/lbs + 80 degrees Water pump pulley: 115 in/lbs Throttle body: 84-89 in/lbs Fuel rail nuts: 75-84 in/lbs

Chevy 3.8L Upper + Lower Intake Manifold Gasket and Tensioner Replacement Part 2
Here is how to remove and replace the upper and lower intake manifolds and gaskets on a 2005 chevy monte carlo with a 3.8L engine. This procedure should be the same for any GM made vehicle with the 3.8L 3800 series engine like the Buick Lesabre, Chevy Impala etc.

How to Test Head Gasket
** Please see my other videos on this topic* Thx! This video is intended for those who would like to know how to confirm a damaged head gasket on a vehicle prior to making the decision to invest a lot of money for repair. My apologies for the camera focus- next video I will pay closer attention, but the information needed is viewable. Further research should be done on the risks of overheating to the engine block and such. This video is meant to simply show a 'how to' on the test method I used quite often when professionally working on vehicles, the results of which are based on chemistry and common industry-standards. I hope you find this video useful. RI.