ZC motor ID please

[tropicwest]

I have access to 70 of similar motors to the photos below.

Does anyone know what year range these would be?

 

[AHHVTEC]

88-91

 

[Finnish EK Racer]

88-91 crx si.

 

[phunky.buddha]

88-91 crx si.

Not necessarily a CRX Si... but definitely 88-91 SOHC ZC.