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Original Message
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| RE: Machining questions |
| By John - 09/30/2002 5:01:02 PM; IP 142.177.94.2 |
I had a 390 block with the "X". It was not a thick wall block suitable for over-boring to a 428. I seem to remember reading that the "X" indicated a higher nickel content which is good.
As far as the vertical scratch goes, asking a machinist isn't always a good idea. He will usually only give you one answer which is the "right" answer, but without any consideration of $$. I think I would ask him to ball-hone that one cylinder only and then inspect it yourself and consult with him at that point. Sometimes the "fingernail" scratch test isn't accurate and the metal displaced by the scratch can make it feel worse than it really is. If after honing, the scratch is gone or only slightly visible with no "fingernails" catching, it is probably all right. It always seems a shame to go for the rebore over something like this. I had a similar question due to a little etching from coolant due to a blown head gasket. The consensus here was to try it. And I will. Will only be out a bit of $$ on gaskets if it's not OK. |
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