Okay, need some help here cause I think someone is feeding me a bunch of bull, My truck is hard to start when it's cold out... really cold... i mean like -20c it's starts getting hard and at -35c it don't like starting no matter what, I have a 1986 ford bronco with a 351w, engine is .040 over with flat top speed pro pistons with moly rings, heads were shaved .010, 1.9 intake and 1.6 exhaust valves installed, plugs are gapped at .055 as recommended in instructions, competion cam were the valve timing is intake open 22btdc and close 54abdc and exhaust would be open 68 bbdc and close at 20 atdc, comp cam lifters, push rods, etc, weiand stealth intake, 670 holley offroad carb with electric choke, msd 6 off road ignition, msd blaster 2 coil, and the pro blillet dizzy 8478 with advance. Let’s see. Timing is set to 12btdc, have done all the tests, no vacuum leaks, choke seems to work, excellent spark to plugs, push on the throttle linkage under the hood and see 2 nice healthy squirts of gas. I have just accepted the fact that she is not a winter motor but now someone is telling me that it is because of the msd, I have been told that msd is a hot system so it will not work in cold climates yet I can think of about 10 or so friends with winterized cars and trucks with msd and they work no matter what temp it is outside, I think this guy is full of bull but I just want anyone’s input on this matter, tech or not, and also should this beastly truck of mine actually start, perhaps change my spark gap?? Thanks in advance everyone.

 

I dont think it's the MSD. They were full of, um, it. Electronics typically work better with lower temperatures, unless it causes something to contract and break a connection, which is doubtful.

It's probably your choke. Readjust as necessary and it should go. FWIW, most motors, even fuel injected, are hard to start at 35 below...

Some other things you might try:
1. Make sure the battery is fully charged.
2. Use synthetic oil, but only if it's a diesel rated CI-4 or better, OR a racing oil approved for street usage. This is so it has enough ZDDP additive so your cam doesn't go flat. A 5w40 would probably be the one to use. This would be something like Valvoline Premium Blue Extreme 5w40. http://www.valvoline.com/products/PBX.pdf
3. Block heater (one that goes into the lower radiator hose) and magnetic oil pan heater. This will help a lot. Plug it in the night before for best results.
4. Starting fluid if you need it.
5. Avoid flooding it out. A wet spark plug will not fire at all and will cause you no end to frustration. I would not adjust the plug gap unless you know they're not firing. You could test it at .040" gap and see if it makes a difference, but make sure it's not drying them out that's really making the difference.