4900 won't hurt a thing with a properly built/balanced bottom end.

That is not correct on a properly built motor. Lugging the motor down to where you are talking about can actually hurt it more in the long run. My motor had the 4750 rev limiter before being built and was then changed to run up to 5000 RPMs. My builder recommends propping it to run 4850-4900 RPMs.

I'm in Stanton for work. Been out this way as well on and off 4 years now. Should be getting my prodigy this weekend. Although I'll be traveling around during duck season I plan to scout around san Angelo lakes.


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Westi if your ever around and not working and wanna set in somewhere with the boats let me know.


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I've been told different from local builders, but I suppose experiences from different builds reflect the views of certain people. Maybe you are right and maybe not. I know from a car perspective, when we ran a 470ci big block camaro at WOT on the weekends at the track, we had to rebuild everything ever 50-75 passes, which was typical for these high HP engines. Whether this applies to mud motors or not, I don't know, but I know that I don't want to rebuild anything unless I'm doing this for performance reasons. Hopefully if you get yours built, you can run it as hot as you want with no issues. I plan on getting a stage 3 on mine when the warranty is out and hope to get that type of confidence and dependability out of mine when the time comes.

Back in the day we used to think lesser RPM was better. We had High PSI motor, LUGGED the fuck out of them with big props... they popped like pocorn. Now we put deeper gears, more PSI, and let the engine spin up without all the additional load on itself and they are lasting longer.... its finding a balance. A stock rod motor can handle a 4750 rpm limit quite well as long as you don't stay on the limiter loading the cylinders with fuel.

Very interesting stuff. I can't wait to get mine staged up later on down the road. Need to save this extra money first lol

I'll stick to running in the 4200/4300 range. Running against the rev limiter most of the time with a briggs block is asking for trouble and I don't care who built it the engine or how they built it.

Why even participate in these discussions? Most of us have experienced or witnessed Marcus and Will go out of their way to help people that have never spent a dime with them. We've also done business with people that actually stand by their work, and trust those gents to do that as well. Just because you don't doesn't mean there aren't decent people doing business. Dont get work done by them, dont climb out of your box to see that there is some new work being done on these engines that actually doesn't hurt reliability like it used to. But also dont come here with your crap that doesn't reflect the fact that some of these guys know more than you about how to build these things CORRECTLY to make them last. Experience matters, and yours is lacking, apparently. Not everyone that does business shits on their customers.

#CFFITR
#TheGhostBoat
#whoneedsphysicsihaveamudmotor

My comments are not geared towards Marcus or anyone in particular but more the reliability of modded motors or lack there of. I’m undaunted by your suggestions. I’ll do as I please and you do the same.

Who is Marcus?

Good question. I could have said Joe or Moe. Matters not when it comes to heavily modded mud motors.

Suppose I build a motor with billet rods for reliability keep CR LOW, use a small cam, Do porting like major manufacturers do (clean up ports), and the Stock Carb. Will that be detrimental to the health of the engine?

It's all a crap shoot. That's my point.

My point is people get hung up on a piece of paper... in which the big companies will most of the time tell the customer it was their fault anyway... Fuck that paper. Ill build engines and make people happy.