I also run my car at 15 degrees initial and it needs 93 octane to run. I'm amazed your running 15 degrees on 87 octane without detonation - My car would have a big time death rattle with that combo.
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1965 K code coupe - numbers matching - restoration ongoing. 1987 LX notch, stock heads and intake, 3.55's and typical bolt on's 13.89@100.25
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