The "black top" engine came in the s14s with 220 or so horsepower and a variable valve timing system if I remember correctly. Electronic ignition as well.
The "red top" engine was the earlier sr with 205 hp at the crank, standard distributor, and standard timing system.
All in all, if you plan on building and modifying the motor anyhow, it doesn't matter at all which motor you get.
And, keep in mind you don't need to swap motors to make a powerful car. The engine that comes with it is pretty beefy, and very boost happy if you want to turbocharge it.
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