ok so i was doing some research on the ZC and found a problem. I have a stamped ZC block and can't find a head that fits. I looked it up and zc blocks vin under the ZC stamp start with either 2 or 5. 2 being a civic/crx and 5 being the integra. The stamp on my block starts with a 7. does anyone know what the fuck is going on? and what head i can use on this block?