While the proven Zacks Rank places an emphasis on earnings estimates and estimate revisions to find strong stocks, we also know that investors tend to develop their own individual strategies. With this in mind, we are always looking at value, growth, and momentum trends to discover great companies.Of these, value investing is easily one of the most popular ways to find great stocks in any market environment. Value investors use fundamental analysis and traditional valuation metrics to find stocks that they believe are being undervalued by the market at large.Luckily, Zacks has developed its own Style Scores system in an effort to find stocks with specific traits. Value investors will be interested in the system's "Value" category. Stocks with both "A" grades in the Value category and high Zacks Ranks are among the strongest value stocks on the market right now.One company value investors might notice is Ally Financial (ALLY). ALLY is currently holding a Zacks Rank of #2 (Buy) and a Value grade of A. The stock is trading with P/E ratio of 7.02 right now. For comparison, its industry sports an average P/E of 7.17. Over the past 52 weeks, ALLY's Forward P/E has been as high as 12.09 and as low as 6.90, with a median of 8.97.Finally, our model also underscores that ALLY has a P/CF ratio of 4.56. This metric focuses on a firm's operating cash flow and is often used to find stocks that are undervalued based on the strength of their cash outlook. ALLY's current P/CF looks attractive when compared to its industry's average P/CF of 5.40. Over the past year, ALLY's P/CF has been as high as 6.59 and as low as 3.69, with a median of 4.87.These figures are just a handful of the metrics value investors tend to look at, but they help show that Ally Financial is likely being undervalued right now. Considering this, as well as the strength of its earnings outlook, ALLY feels like a great value stock at the moment. 5 Stocks Set to Double Each was handpicked by a Zacks expert as the #1 favorite stock to gain +100% or more in 2021. Previous recommendations have soared +143.0%, +175.9%, +498.3% and +673.0%. Most of the stocks in this report are flying under Wall Street radar, which provides a great opportunity to get in on the ground floor.Today, See These 5 Potential Home Runs >>Want the latest recommendations from Zacks Investment Research? Today, you can download 7 Best Stocks for the Next 30 Days. Click to get this free report Ally Financial Inc. (ALLY): Free Stock Analysis Report To read this article on Zacks.com click here. Zacks Investment Research