Oil leak oil pouring from around a round silver device located directly behind thermostat housing looks like a silver disk with a single bolt clip holding it down.has no wires or plugs hooked to it. it rest in a little spot of its own about level with the head gasket what is it

SOURCE: I have a 1997 Chevy

Ihave a 96 s10 lt blazer First of all the steering coloum is now where near the engine block and the bracket you mention is for the throttle cable and the cruise control cable and has no gasket for any kind of a seal with the intake manifold. The 4.3 and most chevy engines have a problem with the intake manifold gaskets if you are over heating then likely the intake manifold gasket is leaking you should check your engine oil for antifreeze that will look like a fomey white yellowey residue and also check the radiator for engine oil floating on the top under the radiator cap. This is a big problem with chevy you can't let espesecly the 4.3 ever over heat.There is olny 8 bolts that hold the manifold to the block and there all in the four corners nun in the middle Y ou can save the engine if you fix it now but it is the intake manifold gasket that is leaking

SOURCE: I have a 1996 Chevy C1500 5.0L Vortec V8. I lost

next step is to remove the intake, you are on the right track, worse i ever found was a cracke block, but that was in a 61 t-bird which was repaired with jb weld ten yrs ago and still holding, but the intake gasket sounds right

SOURCE: my 1994 camaro w/ 3.4L engine has an oil leak in

This is most likely a leak from your rear main seal. It happens and can be a pain to replace if you're a DYI kinda person without the nec. equipment.

1. Raise and safely support the vehicle with jackstands.
   
2. Remove the transmission.
   
3. If equipped with a manual transmission, remove the clutch and pressure plate.
   
4. Remove the flywheel assembly.
   
5. Using a suitable prytool, carefully pry the old seal out.
   

1. Clean the area and coat the seal with engine oil. Install the seal onto tool J-34686 for 3.4L engines, J 41349 for 3.8L engines or J 35621 for 5.7L engines.
   
2. Install the tool (with the seal mounted to it) onto the rear of the crankshaft. Tighten the screws snugly to be sure the seal will be installed squarely over the crankshaft.
   

Exploded view of the rear main seal installation - 3.4L engine
Click to Enlarge

1. Tighten the wing nut on the installation tool until it bottoms out.
   
2. Remove the tool from the crankshaft or rear oil seal housing, as applicable.
   

Rear main seal and installation tool - 3.8L engine
Click to Enlarge

1. Install the flywheel.
   
2. If equipped with a manual transmission, install the clutch and pressure plate.
   
3. Install the transmission.
   
4. Check the fluid levels, start the engine and check for leaks.
   

SOURCE: my engine oil looks like chocolate milke shake

In some cases I have seen blown intake manifold gaskets cause a milkshake in the crankcase inspect the lower intake gaskets coolant passages at the end of the cylinder heads for damage. I would suggest a compression test and a cylinder leak down test befor further tear down.

SOURCE: water leaking behind oil pan on a 95 chevy camaro-3.4L

If I rember correctly, there are two freeze plugs in the back of the block, behind the flywheel. They generally dont go bad often because they are pretty much protected. As that angelo guy said, more likely a hose or rear of intake gasket, but you have to look, from here I can't see it!!!