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Having been a 1989 S/C owner and competition driver since I bought the car new off the showroom floor 20 years ago. I have to agree with Palos that increasing the crank pulley diameter appears to be the easiest and most cost effective way to achieve extra performance.
If you will take the time to review this Club's archive Forum discussion posts you will find much information on this topic. Go to "Home" section and poke around.
Experience seems to indicate 200-225hp should be the maximum output that the stock OEM internals can safely handle and it quite easy to achieve with the original running gear.
Of course, as in all mods the higher output from the engine the shorter lifespan of it's componenets and the engine as a whole.
With a pressurized engine expect lots of piston ring "blowby" which mandates oil changes when ever the oil turns dark indicating particulates in the oil.
Since I did much Road Racing and subseq
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