Usually JDM engines never have a number after the letter (H22A, B16A, B18C, D15B, etc). The USDM ones have a number after the letter such as the D16Y7, D16Y8, D16Z6, D15B7, B18C1, B18C5. It's just a matter of memorizing the engines. Just study the world of Honda and these things should get stuck in your head.
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