Hey everyone, I've just had my 91 G13BA sierra engine completely rebuilt and I'm in the final stages of preparing everything before I put it back in, I forgot to check what plugs were in it prior to rebuild and was wondering what plugs to put in, I heard NGK Iridiums were the go, just unsure of what model I need? Also, is it worth replacing the leads? The current leads don't look too bad, no burn marks or anything.
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