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X amount of cubic inches is only going to give you Y amount of torque, if the stroke of two engines is the same. You can increase torque a bit if you increase compression, but not to a great extent. The only way you can get considerable more HP is to change the torque curve and increase the engine RPM. I don't know what class you pull in, but where I pull, I'm only allowed to run at no more than 10% over factory rated RPM. A cam would be of no real value to me. BTW, electronic ignition does not give you much more - unless you compare it to a standard ignition system that is in need of tuning. Higher octane gasoline does one thing: It burns more slowly. This is useful if you are experiencing engine knock. Otherwise, it will not give you any additional HP. The is ONE way to get more HP from your gasoline - find a gasoline that has more MBTU of energy. Most gasolines are rated at between 110,000 and 114,000 MBTU per gallon. The higher the MBTU, the more "bang" you get per explosion. I have not found a way to know how much energy is in one brand of gasoline versus another. Perhaps racing gasoline has more. I dunno. Bottom line... the only real way to increase HP is to increase cubic inches - if you are limited in what you are allowed to do with your RPM. Personally as a puller, I'll go with torque anyway. I like the way a Case can lug down and just keep on going.
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