No Craig I haven,t used any octane boost,just 94 octane gas.Moper,I didn,t have it dynoed,but had my other motor(small stroked 340to 372)dynoed and it made 452hp@5700 so am kinda going by that dyno run.My heads are Eddy RPM,s with a mild P&P.I ran 11.32@116 with the 28,s and 4.30,s.