think you would be hard pressed to, find someone with a manufactured system that has sustained the kind of damage described, unless there was something done.
Quite the opposite, actually. It happened a lot. In fact, there are fewer manufactured systems on the market today than there were 5 years ago. In addition, many vendors quit offering propane systems. Why? Because motors were popping left and right.
You don't hear as much about motors popping now because fewer and fewer people are running propane. 5 years ago if you attended any drag racing, sled pulling, or dyno event, there were plenty of trucks running propane. Today, you'll have a very very hard time finding a single truck still running propane. Most of those engines have already destroyed themselves.
How about those people using very small amounts of propane for mileage only? Well, quite a few of those engines have popped too. 5 years ago you would see diesels with propane tanks in the bed of the truck. Now, I can't remember the last time I saw one. Used to see a lot of people on vacations with their diesel trucks and camper trailers in tow - many of them with propane tanks in the back with feed lines running to the engine. Now, I can't find any of them anywhere.
Ask yourself what people are doing today. Nitrous and straight water injection are the popular choices, and what you'll see on a majority of trucks running any kind of "drugs" on their engines.
Propane is no longer popular or even recommended by most people and vendors. There's a reason why.
In fact, most people have run their system for years and use it everyday. As long as you don't have to use a ton of propane, you will save $$ and the modest power gains of around 60-80 rwhp is a bonus.
60-80 rwhp gain means you're running twice as much propane as what most consider "safe". Personally, I don't recommend any amount of propane. However, those that do generally recommend a max 40 rwhp gain - or less.
Yes, most people who think a little is good, more will be better, don't understand the idea behind propane fumigation in diesel engines. They throw everything but the kitchen sink at their engines, stacked boxes, injectors, nitrous, then try to make big power with propane. Radical tuning has caused its share of windowed blocks as well. You would get the idea from reading some of these posts that propane is the only bad thing you could do to your truck.
Can you blow up your engine with chips and programmers, injectors, etc? Yes. However, your chances of losing an engine running propane are significantly higher than any other single mod you can add on your truck. The reason why is there is nothing you can do to eliminate the cylinder pressure spike when running propane. You can try to control it, you can try to reduce it, but you can never get rid of it. Fuel in the cylinder is going to ignite, and propane is introduced at the same time as the air. It's going to burn, and you can't control when it decides to ignite.
Aftermarket injectors - can be precisely controlled as to when fuel is injected, and thus when the fuel ignites.
Chips/programmers - can control when fuel is injected, and thus when it ignites.
Nitrous - is NOT a fuel.
Water - is NOT a fuel.
Propane - is a fuel, cannot be controlled as to when it is injected, and thus cannot be controlled as to when it ignites. The ONLY thing you have control of is quantity.