Here at Zacks, we focus on our proven ranking system, which places an emphasis on earnings estimates and estimate revisions, to find winning stocks. But we also understand that investors develop their own strategies, so we are constantly looking at the latest trends in value, growth, and momentum to find strong companies for our readers.

Of these, value investing is easily one of the most popular ways to find great stocks in any market environment. Value investors use a variety of methods, including tried-and-true valuation metrics, to find these stocks.

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 to watch right now is General Motors (GM Quick QuoteGM - Free Report) . GM is currently sporting a Zacks Rank of #2 (Buy) and an A for Value.

GM is also sporting a PEG ratio of 0.87. This metric is used similarly to the famous P/E ratio, but the PEG ratio also takes into account the stock's expected earnings growth rate. GM's PEG compares to its industry's average PEG of 2.47. Within the past year, GM's PEG has been as high as 1.17 and as low as 0.71, with a median of 0.92.

Value investors also frequently use the P/S ratio. This metric is found by dividing a stock's price with the company's revenue. This is a prefered metric because revenue can't really be manipulated, so sales are often a truer performance indicator. GM has a P/S ratio of 0.63. This compares to its industry's average P/S of 0.99.

Value investors will likely look at more than just these metrics, but the above data helps show that General Motors is likely undervalued currently. And when considering the strength of its earnings outlook, GM sticks out at as one of the market's strongest value stocks.