It could be done but the cost would be out there. Then there is the problem with keeping the tranny and rear end together. Both were OK but not fantastic and they did have their problems at 23 HP. I've spent a fair amount of time in the field on a CA and I really don't think the tranny and rear will take that much power.
The basics are simple. To raise HP you have to up the compression. That can be done in several ways. Non restrictive intake and exhaust. The intake allows more air to enter the combustion chamber. More air = higher compression. That requires more fuel to have the proper fuel air mixture. The exhaust requires less work from the engine to get rid of burnt gases freeing up HP. No one makes and aftermarket high performance intake and exhaust for that so custom shop...not cheap. Yea you see things advertised that this can give you more HP. What most items do is free up HP. Performance intakes and exhaust can give on the average about a 10% increase in HP (they claim more but test show different) . So what's 10% of 23....2.3 HP. So now yer at 25.5...not much gain. So now that you have spent money to get maybe 2.3 HP if the head isn't able to use the extra you are right back at 23 HP. So now you fix the head to pass that air and you are back up to 25.5. SO the next step is to go with a custom grind cam. Have fun finding one for that engine. What the custom cam will do is open the valves wider and for longer allowing more air in. If the head will not pass the air it's a waste of money. You can only do so much with a stock head. So the next step is high compression pistons or shaving the head. You can only take so much off a head before the piston hits it, thats bad. I really don't think any company is making high compression pistons for that engine. Just not enough demand. To make that engine make 40 plus HP you would be looking at 12:1 or 13:1 pistons. Again the bottom end will not take that. You would have to have better rods and a better crank to keep it together. The last option would be to turbo or super charge it. Again you going to have to look at the bottom end. Now I can tell you that in 2nd gear with a 2-12 plow that CA will dig a hole without killing the engine. So on a pulling track weight is going to be an issue with the extra HP. You are going to have to weight that CA to the point that you are pulling against WD's and WD45's or else yer going to be half way down the track spinning yer wheels.......if the tranny ain't laing all over the ground.
Basic options for more ponies out of it by X2 are raising the compression a lot, maybe a port and polish on the head ad, bigger valves, custom intake, exhaust manifold, bigger carb and custom grind cam. To come close to double the HP there is no simple fix on any IC gas engine. And the bottom end isn't strong enough so you would most likely have to have custom made rods and crank.
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