Hello fellas and ladies :cheers: if they are here. I was recently on another car forums trying to comment about SR motors. And It got me a thinkin, what is the difference between a different year Black top? I heard that black top are the best to get, but do any of these motors have like variable timing? Is it worth my time and money on a s15 black top compared to a s14 black top? Help a brother out!!!!!!