a friend of mine has a 90 prelude si, im not to familiar with older preludes. he said his rings are shot, and he wants to replace the block. i was wondering which engine came in these, i looked at his block but it was covered in oil, and i couldnt read it. also if anyone knows any sites dealing with older preludes that would be a great help too. i dont know much about anything other than crx's and civics, but i want to help him get it running without him having to spend a fortune. thanks