1. What Christians are generally not aware of if that the ASV is simply an "Americanized" version of the British Revised Version of 1881. This is clearly stated their preface.
PREFACE TO THE AMERICAN EDITION
A few statements need to be made respecting the origin of this edition of the Revised Version of the English Bible.
In the course of the joint labors of the English and American Revisers it was agreed that, respecting all points of ultimate difference, the English Companies, who had had the initiative in the work of revision, should have the decisive vote. But as an offset to this, it was proposed on the British side that the American preferences should be published as an Appendix in every copy of the Revised Bible during a term of fourteen years. The American Committee on their part pledged themselves to give, for the same limited period, no sanction to the publication of any other editions of the Revised Version than those issued by the University Presses of England.
There still remained the possibility that the British Revisers, or the University Presses, might eventually adopt in the English editions many, or the most, of the American preferences, in case these should receive the approval of scholars and the general public. But soon after the close of their work in 1885 the English Revision Companies disbanded; and there has been no indication of an intention on the part of the Presses to amalgamate the readings of the Appendix, either wholly or in part, with the text of the English editions.
2. The second -- and most important thing which Christians are generally not aware of is that the Revised Version (and therefore the ASV) are EXTREMELY UNTRUSTWORTHY. This was brought out is great detail by John W. Burgon in his book The Revision Revised (1883) where he made this unequivocal statement:
My one object has been to defeat the mischievous attempt which was made in 1881 to thrust upon this Church and Realm a Revision of the Sacred Text, which—recommended though it be by eminent names—I am thoroughly convinced, and am able to prove, is untrustworthy from beginning to end.
Anyone who wants the truth about the MLVB, ASV, and RV owes it to himself to read and study The Revision Revised.