Post by
spitz7985 »
https://forums.nicoclub.com/spitz7985-u2738.html
Wed Jan 07, 2004 8:54 am
civics91, this is what i found-
91-mid 93 are all the same. Later 93s-94 are the same as S14s.The best way to tell on a 93 motor is to look for the SCVs, if it has it, they're early-mid, if not, it's a later model. SCV = Swirl control valves, or secondary butterflies. There's a large vacuum controlled actuator mounted on the back of the head that operates them.
is your motor from early or late '93?