Head condition

krazykuda said

1. Compression test.

2. Leakdown test.

3. Or pull the heads, flip them over and put water or laquer thinner in the cylinders and see if any leaks through the valves...

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None of that will do what he asked with the guides. He asked about valve GUIDE leakage. Only one way to check valve guides and that's to remove the springs and measure the valve guide wear with a dial indicator against the side of the valve face.