I am in the process of building a b20vtec and need to now exactly how close the valve clearences are and what exactly is the safest advancements on the set up with a b18c head? I know it makes higher compression so I wanted to know... Also the swap is going into a 89civic si. Should I convert to obd1 or can I get away with obd0....I was also thinking about sending the ecu out to zdyne for the one wire conversion.. I also plan on going with a skunk 2 intake to eliminate the secondarie butterflys problem. after doing so it should wire up the same as a b16a head as far as sensors go? please correct me if I am wrong. any input would be greatly appreciated..