The proven Zacks Rank system focuses on earnings estimates and estimate revisions to find winning stocks. Nevertheless, we know that our readers all have their own perspectives, so we are always looking at the latest trends in value, growth, and momentum to find strong picks.Of these, value investing is easily one of the most popular ways to find great stocks in any market environment. Value investors rely on traditional forms of analysis on key valuation metrics to find stocks that they believe are undervalued, leaving room for profits.On top of the Zacks Rank, investors can also look at our innovative Style Scores system to find stocks with specific traits. For example, value investors will want to focus on the "Value" category. Stocks with high Zacks Ranks and "A" grades for Value will be some of the highest-quality value stocks on the market today.One stock to keep an eye on is Par Pacific (PARR). PARR is currently sporting a Zacks Rank of #1 (Strong Buy) and an A for Value.Value investors also love the P/S ratio, which is calculated by simply dividing a stock's price with the company's sales. This is a prefered metric because revenue can't really be manipulated, so sales are often a truer performance indicator. PARR has a P/S ratio of 0.21. This compares to its industry's average P/S of 0.33.Finally, we should also recognize that PARR has a P/CF ratio of 3.87. This metric takes into account a company's operating cash flow and can be used to find stocks that are undervalued based on their solid cash outlook. This company's current P/CF looks solid when compared to its industry's average P/CF of 5.31. Within the past 12 months, PARR's P/CF has been as high as 81.73 and as low as -19.79, with a median of 3.83.Another great Oil and Gas - Refining and Marketing stock you could consider is Phillips 66 (PSX), which is a # 2 (Buy) stock with a Value Score of A.Phillips 66 is currently trading with a Forward P/E ratio of 7.37 while its PEG ratio sits at 0.42. Both of the company's metrics compare favorably to its industry's average P/E of 5.39 and average PEG ratio of 0.48. Free Report Reveals How You Could Profit from the Growing Electric Vehicle Industry Globally, electric car sales continue their remarkable growth even after breaking records in 2021. High gas prices have fueled his demand, but so has evolving EV comfort, features and technology. So, the fervor for EVs will be around long after gas prices normalize. Not only are manufacturers seeing record-high profits, but producers of EV-related technology are raking in the dough as well. Do you know how to cash in? If not, we have the perfect report for you – and it’s FREE! Today, don't miss your chance to download Zacks' top 5 stocks for the electric vehicle revolution at no cost and with no obligation.>>Send me my free report on the top 5 EV stocksWant 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 Par Pacific Holdings, Inc. (PARR): Free Stock Analysis Report Phillips 66 (PSX): Free Stock Analysis ReportTo read this article on Zacks.com click here.Zacks Investment Research