Well guys I was check my ECU codes on my 92 LS and the ecu didn't have any code, so that means everything is working fine or what? / Okay I'm trying to buy this si head from a friend of mine for $300 and he claimed is a 2000 head. So how can I check the year and the condition of the head. And that can I check on the head to see if is good so I can do a ls/vtec.