It is on the front right bottom corner of the engine block just above the oil pan.
That is you standing in front of engine looking at it.
on my 97 454 vortec its on top in the back next to the distributor cap
usually at the back of the engine around the distributor
try searching at bing.com images
On top, way in back, close to the base of the distributor.
In back of the engine, on top, just to the drivers side of the distributor.
intake manifold
On the driver's side of the engine, between either the front two or middle two spark plugs.
on driver's side of engine....right above the manifold...about center between the two front spark plugs.
It should be screewed into the drivers side head between the first and second spark plugs. I have seen it on the other head at times.
Faceing the engine its under the dis-cap on the right side. It is also very hard to get to, I advise the help of a profesional tech to change.
Screwed into the engine block under the distributor.
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