I honestly cant answer that but ive seen it labeled this way 3 times so far in my search. The only 90-93 B20 i see is in the Prelude 2.0Si which is a DOHC engine. it says LS B20 i havnt found a LS B20 so far and if its a vtec head. teh B17 cast ive found is P61 and PR4. This is a more popular current list. They are so many older variations and cast numbers who knows if its right i cant find any thing that states it either way. If you can find something to justify it by all means let us know, ill be more than happy to fix the chart. Between EDM,JDM,USDM it could be from one of these other markets.