10 lbs with stockish iron heads and a siamesed iron block. It was breaking up over 6k RPM until I increased the timing to 35* and it woke right up.I had started taking timing out over 5500 RPM and it did not like that.Best pull was 9.907 @140 MPH with 35* and NGK 8's.Patrick advised me to go one step hotter and I went the wrong way I'll test again with 7's and see what happens before any carb changes.
