JD A Like an edge,

1. What you refer to as a "hotter" coil I assume to be one of the high perfromance high energy types as used on solid state ignitions. First, regardless of your stock coil or one advertised as a HIGH VOLTAGE COIL, they will BOTH fire at the same voltage, as thats determined by the plug gap distance and the medium (compresion and fuel) in which it fires.

2. So, a high performance coil wont fire at any higher voltage UNLESS you widen the plug gap, in which case even the stock coil would also. HOWEVER, if the high performance coil is more efficient (less heat and magnetic losses) (which it may well be due to better materials), it is possible that it may impart slightly more energy across the plug gap than the cheaper stock coil. THERFORE, yes you can install it and yes it may yield slightly more spark energy (although still at same voltage), but it wont help all that much.

3. WARNING, The high performance coil may draw more current than the conventional stock coil, therefore, the points would burn out prematurely.

4. NOW, here's how they are intended to work and why they are designed for and usually do indeed fire at a higher voltage. High energy solid state ignition systems are designed to produce a longer, fatter, wider, hotter (more surface area) current arc across a wider plug gap (maybe like 040 to 055 versus your 025). To do that, you have to put more energy into the coil and store more energy in its magnetic field. To accomplish that as its input voltage remains the same at 12 volts, you have to pass MORE CURRENT through it, which would be destructive to points, but fine through a solid state switch as in the electronic ugnition control unit. So, if you want to couple that high performance coil with an electronic ignition switch box (to replace mechanical points) its only then that you get the true and most benefit out of that super coil.

5. Hotter Plugs: Thats only needed if the heat range of the plugs youre using isnt high enough to burn off unwanted residue. The physical heat characteristics of the plug is not the same as the curent arc produced across its gap.

BOTTOM LINE: The high performance coil by itself wont really help you much at all and may cause premature point burn ups if it draws excess current over what the points were designed for, which is around 4 amps or less. It will fire the plugs at the same voltage as your stock coil. It may be more energy transfer efficient which may help slightly, so long as it doesnt fry the points. NOW if youre runnign extreme high compression and usign exotic fuels, its then that you require and benefit from BOTH a high perf coil and a high energy solid state igntion system. If youre just a stock puller at stock or near compression and regular fuel, youre not gonna need or gain much from a so called "hotter" coil.

To gain that edge youre lookign for if youre at stock compression, instead of worryign about ignition at this point, try and eliminate horsepower robbers like fan loads and generator loads or water pumps or gears or hydraulics etc etc etc. Then if you want to up the compression and use exotic fuels, you need to look into the high energy ignition systems which are tehn needed.

Hope this helps. Good luck n God Bless Ol John T Nordhoff in Indiana

~A hotter [higher output] coil can help a pulling tractor if you are running high RPM's, higher compression, larger plug electrode gap, or hard to ignite premium fuel, but won't make much difference on a stock engine.

~One of the problems with running a hotter coil is primary current [distributor system]... Usually the higher the coil's output the higher the primary current & that can drastically shorten contact point life... If you have an engine that needs a hotter spark to properly ignite the fuel air mixture then a high output coil would be an effective way of achieving that. It might also be a good idea to install a electronic ignition system to properly handle that [probably over 6 amps] coils current load. There are more efficient coil designs [such as the E core coil] that can increase the KV output without increasing the primary current but those don't look like a conventional coil & aren't allowed in some pulling classes.

~If you are talking about a magneto system there are higher output coils available for some Wico's but there again the gain is small & not usually measurable. A higher output magnetic rotor would be a much better addition....

~Just adding a hotter coil or hotter [different] plugs on a healthy stock engine usually won't make enough difference to even measure & the money would probably be better spent elsewhere.....