For the 2002 Honda Civic 1.7i (D17A engine), the valve clearance specs (cold engine) are typically:
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Intake valve clearance: 0.20–0.24 mm (0.008–0.009 in)
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Exhaust valve clearance: 0.25–0.29 mm (0.010–0.011 in)
Make sure the engine is completely cool before measuring or adjusting. Always double-check with the exact engine variant (D17A1, D17A2, etc.) as some tolerances may vary slightly.
Keep in mind, you can find the precise specs on the service manual, though. If you could give us more details about your Civic, we're more than happy to point you in the right direction.
