On 84-87's the pans aren't the same, but they're swappable, on the 88-91's I think they're the same. Mainly has to do with the shape on the '84-87's, I have a pic of it somewhere.
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-Harry
AIM: NDcissive
CRX and Pre '92 Civic, Engine Tech and Tuning, & Track and Autocross Forum Mod