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A couple of things can cause a leak in a fresh head gasket.
- Not running a tap down the head bolt holes / a die over the head bolts.
- Reusing the old head bolts.
**These can cause faulty torque readings and an insufficient seal
- Not having the head resurfaced.
- Not having the block checked for squareness/cut.
**Uneven surfaces won't seal properly
- Foreign material on the mating surface
**Gots to be careful and keep everything clean
If the leak is around the cylinder, which it probably is, only combustion gas (air/fuel mixture) will be entering the water. Won't see any oil in the water. There will be fuel but it will be harder to detect.
Some mistakes are more expensive than others. Best to get it fixed before it ends up costing more.
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