octane 12.5 to 1

[DAVE14]

my 440 im sure needs jetting & its 12.5 to 1 but in the late fall & winter I got away with running 94 octane with some octane booster & it ran great no pinging etc. yesterday the temps were almost 20 degrees it it definitely souned pingy , exhaust temps were big time warm even just puttin around leisurely it sounded pingy off idle & a little under a load other rpms was allright ,now that its warmin up what octane does this thing need & where can I get it in Canada the local airport cant be bothered selling me a little bit of high test ?

[400exstud]

I would run 110 octane with a 12.5:1 440.

[underpowered]

I would go with atleast 100 octane.you could go higher. around here, the lowerest i can get is 110 unless get it at my shop, then i can get many different ratings. I know alot of people buy it from the local airport, it is usually reasonable too.