Marc Faber, the author of “The Gloom, Boom & Doom Report,” says investors need to brace for a drop of 20% or more by the time 2013 closes, predicting a market fallout similar to what was seen in 1987.

“In 1987, we had a very powerful rally, but also earnings were no longer rising substantially, and the market became very overbought,” Faber said Thursday on CNBC. ”The final rally into Aug. 25 occurred with a diminishing number of stocks hitting 52-week highs. In other words, the new-high list was contracting, and we have several breaks in different stocks.”

He noted that during a two-day period this week, as the S&P 500 nears an all-time high of 1,709, there have been 170 new 52-week lows. That means just a relatively few companies are driving the market higher.

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