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On the dervs, the block tests are not very conclusive. I know on mine, I ran a number of block tests and kept getting a negative. However, there was clear evidence of head lifting around cylinder 4. To my knowledge, early days of HGF on a derv is unlikely to show.
By all means, do one if handy. If you get a positive, then you have problems. If you get a negative, you cant rule out hgf.
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