Hi neo, this is my first post on this site.Basically because I'm a newbe and feel more comfortable just reading info now on these cars. However if you can extrapolate the info I gained from dealing with a 500 horse Buick Grand National. I ran alhky injection which allowed me to raise the boost upwards of 26-27 lbs of boost. I would also go to Menards and buy a gallon of Toulane or a quart of xylene. All to avoid detonation. In fact running alhky injection was a very popular, cheap and easy mod to increase boost thus horsepower. You could inject 70%,90% or the 99% alhky. 70 & 90 I got @ Walgreens 99 @ work because that was used in boring to clear out moisture in air lines. I haven't been around GN's for years since I sold my 87. Maybe this will help you and good luck.
P.S. I believe meth was a lot more corrosive than alhky.
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