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The four oblong holes in the frame between the wheels, are they lift points or just transport holes as some have said? The owners manual doesn't mention the rear holes and the diagram of what may be the front holes is not good enough for me to trust.
They're both, to jack or lift the car, you can jack at those 4 points or the front/rear crossmembers. The dealer will lift at those 4 points, ideally with their Kent-Moore lift pads. For transport tie down, those holes are also used, with a T-hook through them. For sources to get the T-hooks, check the Corvette Racing section.
Unless you can lift at all 4 of those "slots" at the same time, I wouldn't do it;
Lift it with the jack under the crossmember (rear) with something like a thin flat plate (I use steel with a rag over it) to span the crossmember ribs.
The 4 holes You are talking about are used to anchor the car on a frame rack at the body shop. Most cars have pinch welds at the bottom of the rocker panels that the frame rack clamps anchor on to. The C5 has no pinch welds due to the design of the hydraform frame. Inside the holes are a reinforcement plates held in with 2 rivets visible from under neath. There are special design frame rack clamps designed to anchor in those holes to hold the car securely to the frame rack. they are also used for transport and are good jacking points. But the main purpose is for anchoring system during body/frame repairs.
As was stated before, the four oblong holes are the jacking/lift points for the car. This is where the shop lifts the car (using jacking pucks) on a lift. It's also the right place to put the jack for changing one wheel.
Ron,
I'm looking at the pic you posted of your wood blocks used when lifting at the front, and I would urge you to be extremely cautious. Your support blocks are extending to cover the oil pan, and it looks like they are in contact with it. The aluminum pan used on the vette is somewhat fragile. I would use shorter blocks that don't extend over the pan.
Also, that is a rather unique looking oil filter. What brand is it?
Paul,
The pan has about an inch of clearance. Even if it where to make contact the weight was spread out so much that I doubt any damage would occur. K&N but just went to the Delco Gold!
Ron W