I would like some Info from the summer racers. I want to build a summer dragster to run bracket races with at our local 1\8 th mile drag way. I was wondering on a few different things. I was thinking should I run 93 octane or just step up to 110 race gas. If I stay at 93 how much do I need to lean it out? And if I run 110 how can i build up the compression to run 110. Can I just shave the head or do I have to buy pistons and do head work. And what about squish? I have no problem with the 110 and would rather use it over 93. And can a stock 670 handle more compression and 110.(crank and rods). I am clueless to racing sled motors in summer temps.im sure I can figure it out I would just like a little info/help.. how many hp does the motor loose from the temp change..