B16's have a shorter deck height than the B18's and B20's.
Also, intake manifold swapping has to be of the same type:
B18 non-vtec is the same as a B20, B18c has a totally unique intake manifold design, the B16 and B17 heads are the same.
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-Harry
AIM: NDcissive
CRX and Pre '92 Civic, Engine Tech and Tuning, & Track and Autocross Forum Mod