What is valve clearance on Nissan pick up 2001, 4 Cylinder. I think it's 2400cc?

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I know it gets adjusted with shims. But I don't know what the clearance should be. I don't want to just guess for a maximum performance. Please respond as soon as you can. The owner has only one vehicle. If there is two or more option, please give me all of them. I'll figure it out. here is again my email: hamidkhatabi at yahoo dot com. Thanks alot.