This summer may be different, according to James Stack of InvesTech Research.

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Also a supporter of Washington Mutual based on value and yield is James Stack of InvesTech Research, who's still up 16% on his WaMu investment and content to hold it.

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The Dow Jones Industrial Average has experienced around 20 bear markets, averaging a duration of one and a half years from top to bottom, says James Stack, president of InvesTech Research, a US-based market tracking firm.

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But Bloch, chief market technician at Raymond James, and Stack, president of InvesTech Research, make one think twice.

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