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The definitive way to determine if there is a burned valve or blown head gasket is to run a compression test.

Mark the spark plug wires; either a piece of tape with the cylinder number or you can buy wire marker labels... your choice.

Remove the spark plugs.

Using a compression gauge, start at cylinder 1. Some gauges press into the sparkplug hole, some thread in, either way, make certain that the gauge is being used properly, then have an assistant engage the starter as though you are trying to start the engine. Make certain that the piston in question comes to the top of the compression cycle at least 3 times.

Write down the pressure that the gauge reports, then proceed to the next cylinder.

Perform the test for all 4 cylinders.

If any of the cylinders is incapable of producing pressure that is about the same as the other 3, you PROBABLY have a burned valve. If the pressure in 2 adjacent cylinders is low, you probably have a blown head gasket.

Either way, if any cylinder has low compression on the compression test, you will not be able to repair the engine without removing the head.

If the compression on all 4 cylinders is reasonably good (close to 90 PSI or more) you probably don't have a burned valve.

Good luck.

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