the sure way to tell is if you look at the actual engine number under "B16a"... found this ono another site...
"I believe we could well be the first site to have found out the only reliable way to tell all the different B16a engines apart.
(well I did, I snuck a look at the JDM parts manual at my local honda service center)...
The 1million series were avliable in the Integra XSi and RSi from 1990 to 1991. And I can confirm there was an Auto option.
The 1.2million series was avliable in the 92 XSi and RSi, and was also avliable with an Auto.
The 5million series was in the Civic and CRX SiR, and no Auto was avliable. However when the 5gen Civic was released the hp was upped to 170hp, but the engine numbers continued on starting with a 5, and other than some visual differnces it can be hard to tell if you have a 160 or 170hp engine.
Well here are the numbers after the 5-
50 1990 160hp }
52 1991 160hp }4g Civic/CRX SiR
and
54 1992- 170hp 5th and 6th gen SiR, SiRII and CRX delsol SiR."
hope that helps!
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