spark plugs
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im changing the plugs in my car, right now i have irridium ngk tr55s. can i go with just the stanard copper ngk tr55? or do i need to have irridium or platinum? its a 95 lt1
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the copper ones you'll want to replace every 30k or so platinum are supposedly good for 100k and iridium longer. Depends on if you have headers & easy plug access. the stock manifolds are a pain in the butt to do plug changes & you would be wise to minimize how often you do them. I am running the tr55's also, but I'm running platinum and don't plan on changing them out for however long I have the current motor in for (maybe another 50-70k)
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o forgot to mention, if you are going to use nitrous DO NOT USE PLATINUM PLUGS. the bond on the platinum tip can get eaten away from that and then you have a piece of super hard platinum floating around your engine.