Quote:

Quote:

"OK...I fail to see how a alum. headed 9:1,484 cammed 440 runs "better" with 100 octane. But if it works for you..go for it!"

you know what's wierd. My 5.2 5 speed 95 dak sport w/ nothing more than a computer upgrade and headers ran much better on 104 (unleaded) mix w/ 93 than straight 93. The truck picked up a little over a tenth and It seemed to run smoother. I only did it because a buddy of mine suggested it. I was thinking it was over kill as well. Maybe because it was a hot day????




I might understand that. Your computer(esp upgrsded)may add timing till it recognizes spark knock from a knock sensor. The 440 in the OP does not have that ability.




got ya... his should run fine on 93 even at 38* total.