Inside 650HP 12v Cummins After 350k Miles

I have always wondered how much wear engine has when modified. Now I know. Thank you for sharing this and being honest without hiding or exaggerating details.

Rod bearings usually always the first to go. I am actually surprised at that much cam wear, but that is a lot of miles. I think 400rwhp single and 600rwhp twin is a good reliable nice driving power level for 12valves.

(Machine shop guy here) something to keep in mind, all of those welds can & will cause weak points in your parts, the factory Crankshaft is heat treated & hardened. It is already very brittle, I have had it in other engines where the crank will actually split (yes like a log) after being welded, or heated in an extreme manner. Not bashing you, if it works it works, just something to keep in mind!

Wow awesome break down of the internals. Thanks for posting!

Great to see you back doing videos Will.

Thank you for showing us your combo. This is exactly what I was looking for. I'll be in touch this spring for sure

Great video! Keep them coming!

Excellent video man. Much love from Alberta! 🤠

Very cool to know that I could go higher in performance (frankly, 99% of the time I'd still run it as conservatively as I would with a bone stock 12V) with no real component degradation. This is a prime example of good old American hot rodding - squeezing the most hp out of an engine without breaking the bank. Subscribed, looking forward to seeing more.

Great video guys!

I've been wanting to get into a diesel truck/cummins as my 2nd vehicle just to dick around with and have fun. I'm a gas engine tech for 5 years and it's kinda spooked me the difference from a gas engine to an older style 12v cummins. However, I've been learning a lot from your channel and it's been awesome, and I'm feeling a lot more comfortable. I'm hoping to take the leap come spring time and pickup a "beatup" ram for sub $6k. Love the content and I look forward to watching more of it!

Sweet video as always

Great to see and hear the engine performed great for that mileage at that power level. I have a '98 12v with Industrial Injection towing compounds that have been on there with supporting mods for around 100k as well. I do everything with it from daily driving it to work everyday to hauling a horse trailer. It really is a proven and reliable setup that works flawlessly. You couldn't ask for better driveability and spool up and G56 I have in it also works great with the 12v. A lot of what it takes to "get things to last" is all in how you drive it. If you drive it like a hot rod every single day, then don't expect super longevity if that's what you're after. There is definitely a time and place for it but I don't beat on it every single day when I'm driving it to and from work. Using quality oil and keeping up with oil changes is another high factor of course.

Great show guys 👌

Glad you made this video, I was already planning on building a project vehicle with a 12 valve Cummins, and this confirms the strength and durability of this engine 😁👍🏻

Great explanation! Thank you

Truly tough engines! Good and interesting video.

Another great video

I need learn more about these. I have had a 94 5.9 just sitting around that I need to start building

I never repond here. But you guys are great. I like smaller Diesel tuning and i know a lot about the subject. Still its great entertainment. Keep it up