1,000 Horsepower or Bust! We Nearly Blew this Engine Up in the Hunt for a World Record! 

1,082 horsepower from a stock block 4.6L is insane. That Rambler is going to be a force to be reckoned with. Can't wait to see the Rambler complete and racing.

What an impressive outcome, Keith is really making us AMC people proud!

This blew my mind. Im shooting to get 300 outta mine, but 1000+ tickled me pink. Mr. Newcomer you are an inspiration to everyone and so many more 4.0 enthusiasts like myself.

OUTSTANDING!! I never thought 1000+ hp was possible on a 4.0 block. Keith really knows his trade. I'm impressed 👏👏👏 Great video!!

Some engines really get my motor running; But I wasn't prepared to make it all the way to boner town on one tank when this "crappy little AMC-6 from the Victorian age" started printing her digits! Us AMC guys don't get a whole lot of love even on a good day, but this was amazing and I can't wait to see this receit printer dropped in the Rambler! Sidenote you should call it the "Rambler 500"

I love these videos. Almost 1100 horsepower is awesome. I knew it was gonna be good, but this exceeded my expectations. Great work, everyone.

Keith keeps people like me in love with their straight six

That’s a spicy 4 liter 12 valve meatball 👍

Goodness hot dang that is soo FRIGGIN BAD AZZ !!!! When the blow off valve flew off my heart sank but damn that is a cool azz engine. Thank you for sharing and congratulations to those guys

Well... Now we know for sure how much the Jeep 4.0 can take. Can't wait to see what it'll do with fuel injection. Nice video my friend!! 💪🔥

I've been waiting to see these guys find the limit of the 4.0 🎉

Ancient push rod straight 6? Check! Cast crank? Check! Carburetor and distributor? Check! 1000+ horsepower? You betcha. Freaking awesome This channel has consistently great content. Thank you so much for bringing this to us. BTW- it takes more power to run the turbo into atmosphere than it does when hooked to the intake. It was the wastegate that blew off, not the blow off valve

Greetings and huge congratulations to Keith on that awesome world record, and thanks to The HP Monster for happening to be there. I'm getting closer every week to my goal of obtaining one of Newcomer's awesome " basic" 4.6 motor for my ZJ, as long as his price doesn't increase with every new eclipse of the world record ha. Yall take care.

Thank you The Horsepower Monster. A very important key for the exact mixture mass distribution in single carburettor operation on many cylinders is the correct, ideally divided intake or charge air duct routing between the pressure carburettor and the intake valves. Although the 5K IR RGB UV (infrared channel) of the camera was not active in the video, the start-up colours show quite well how precisely the system works. It is possible to galvanically clean these steel tarnish colours and then you can clearly see the integrated material thermal exhaust pipe average value with every new test bench run. SJVD/MFM Michael Frithjof Miller

Navarro built a turbo Indy Car back in the day with the AMC6 running ~700 HP. Its nice to see someone following in his footsteps and making huge power with this underappreciated motor.

Watched this again... I think someone needs to call those POWER NATION guys and tell them to take those anemic comments back. Even the 4.2L is capable of much more than what they did with it. The 4.0 Edelbrock head or one of Keith's 4.0 Cylinder heads onto the 4.2L along with some machine work.... I'd like to see that next...C'mon Keith.

Been waiting on this video for years!!!!

These videos on the Jeep inline 6 are why I'm subbed. I know mine needs a rebuild soon amd ive been doing my homework to see whether or not I want to get absurd with it. Thank you for these🇺🇲

Very cool to see the before and after. Great video

That turbo test was really neat, but it didn't show the full story because there wasn't any resistance on the compressor side. To really see how parasitic a turbo is, you should have it blowing through a restriction set to match the desired boost pressure that the engine will operate at.

Great job as always Newcomer racing! Always top notch work. And Jeff video is awesome keep up the great work!

This is what they call the right kind of crazy! Hats off to you guys!

Good work as always!

It’s nice to watch talented engine builders. Share the knowledge.

Keep the amazing work coming love your videos.

Congratulations guys that's awesome

Very nicely done.

What's nuts? That's freaking NUTS!!!

Oh yea boys, ive seen this man at the dyno testing his engines in other videos this will be a good watch i promise, i appreciate his dedication to testing and improving his combinations even to destruction 😂

Thanks!

Horsepower monster continues to impress. Totally exciting to watch. Getting to see world records accomplished is really really special. Thanks for the story and the excellent filming!

Absolutely amazing👏 congratulations I never would have thought it possible to get that much HP out of an inline 6 especially with a stock crank and block. Great job.

Great job guys , love seeing boosted six’s making some steam .

I waited years for this!!!!

Cant wait to see it in the Rambler!

Sick!!!! That’s super impressive out of a 2 bolt main set up.

Nice Channel, I'm glad that I found You.

Great video!

Another great video Jeff, love your site!!

Newcomer rocks!

You guys just got yourselves a new subscriber! Building my beloved little straight 6 to these numbers give my xj a whole new outlook. Reinspired? Check! Can't wait to see the fuel injected performance and numbers! This is truely amazing!

That was so awesome.. thanks for sharing 😊

4.0 videos are the best❤️❤️

I am Honestly IMPRESSED beyond belief! And it did it at 5500 RPM? WHOA!!!!

Always great stuff from you!! Nice!

That's crazy 🤪. Congratulations

It's nice, I like it. Good demonstration of why engine management is much better than carbs and basic ignition systems.

I can't believe this video was released since the last time a Jeep turbo build was made and broke that record effortless, you guys from Newcomer Racing, are my heroes man, i don't know the name of the guy i think is the owner of the team with the harley davidson coverall and black and white cap, the knoledge, effort and passion you guys put into build this engines, this straight engines that i think not many people care o talk about, is amazing. NOW i can't wait to see This engine with EFI upgrade, maybe ignition upgrade with that prototype sensor that you already made in the last build to have full control of ignition, not mention if you upgrade all the bottom end to push All the limits beyond the std test you're doing now. CAN'T WAIT to see this engine again, of course with Newcomer Racing at his side to now is going to perform the best it can. And of course Thank to Horsepower Monster for sharing all this content that is so hard to see in other place! Thank you so much guys, keep up the work and if possible share this things every time you can!

20:39 & 21:03 I think they're still called wastegates even when they're blowing off the header.

Great job men

Just now realized I’ve been addicted to the H.M. Channel since it first popped up, but have never hit the subscribe button. After watching a stock bottom end 4.0L jeep engine post 4 digit HP #’s, I damn near put my finger straight through my phone smashing that subscribe button 😂😂. Well done. Will be looking forward to watching more.

So dang cool. Stuff like this is why i love this channel. Vroom vroom!!

Good stuff guys!

Rocks! I want that in my Grand Cherokee!

All I gotta say is that was mind blowing for sure. I hope this engine will be long lasting.

Great job it was great fun watching 😁☕👍

That's awesome guys....That's pretty dam close to the zz632 numbers 👍🏿

Look at the numbers they're getting out of the 2JZ, just imagine what the "4.0" would do if it had a little bit of help from the aftermarket....

Simply impressive

My experience was taking a Datsun 510, converting it to propane and turbocharging it. In 1979. I never sorted out the flat spot between NA and boosted, but I had a blast...until cartwheeling the damn thing.

love your videos!

Matts off-road recovery Needs this for the banana!!!

That's pretty cool for a straight six

I JUST SAW HISTORY MADE WITH ENGINE WOW = A big thanks guy's ❣👍 Old F-4 Phantom 2 fighter jet Shoe🇺🇸

GREAT VIDEO!

Nothing like a straight 6

Pretty cool video, ty.

I love content like this. Very much looking forward to another A-bomb Corvette vid BTW. It's just great that project. Enjoy every part of it. Re the turbo loss, the free air HP drop is still artificially low I reckon. What it wants is deadheading into an enclosed chamber and held to say 15psi (or whatever) against a couple of blow off valves and connected to the wastegate to simulate the intake manifold pressure the turbo has to actually pump. That'll give a truer pumping loss indication. I reckon it'll be around about 100hp loss, which actually isn't that much in the overall scheme of things, particularly when just cruising around.

Frkn awesome!

That’s SICK!!!

Great film. That's a lot of energy going on in those 6 cylinders. Needs to look at in manifold design before going for the 1500 record👍

Keep up the amc/jeep content!

we need an update on that rambler!

very nice job. impressive

Impressive

When most people start conservative at like 5 pounds and they just jump off with 26 pounds of boost lol

I love it... That's one mean ass 6 banger..

Super cool engine! It would have ben nice to have a head available for the Ford 4.9l straight six.

Cool build and i as a jeep owner with a mild built l6 that knows how good they are . Thats impressive to say the least. I do wish i had a cam inmine from new comer ut they are expensive tho.

Am I the only one who noticed the self tapper just absolutely sent into the CRT frame? Gotta love old tech sometimes lol

I love my homebrew 4.7L NA stroker at ~300hp/370tq but this is epic!

A thousand horsepower on stock mains this just blows my mind. The durability of the 4.0 jeep can't be beat. 😊

MAN,it surely would be cool to have awesome friends like yours!!! 😂 I really was expecting to see the head on that 4.0 to blow sky high, and I never would have believed that 1,000+ ponies would be pumped out of that normally anemic 6! Thanks for impressing the socks right off of my feet!!! Love your content!!!

This was awesome. Can't wait to see it with fuel injection and a better waste gate setup!

Algo- ment. Awesome

Hopefully this leads to seeing more jeep. 4L I6 builds. It'd be cool to see what other people can do with the engine after seeing this potential.

in 2005, people were like "only certain engines with the best parts can make a thousand horsepower." in 2025, seems like ANYTHING can make a thousand horsepower if it has the right parts in it. all a matter of money and proper R&D. i can't imagine how it'd go with ITBs!

🎉🎉🎉🎉🎉 muchas felicidades!!!!!!!

I have always loved straight 6’s and a old friend of mine built a all out drag whine was I Ford Pinto and this guy is a perfections on any thing he does and he powered this car with 300 Ford straight 6 and this was 25 yrs ago and it was super fast bracket car and the car set in his garage for at least 10-15 years and a old friend of mine bought this drag car and he put a supper charged all aluminum Ford 428 and don’t remember what horse power he can but I know he had to put longer wheelie bars on and I never seen him lose and it looked like a stock car until you looked inside and under car and everything inside the car was aluminum sheeting full funny car cage with a parachute on back that was required in the rules they have had. And being so short it was a hand full but if it launched perfect it went straight down the track in low 8’s but if you did not get it in the groves and perfectly straight at the 60’ marke he would shut it down . And when this pinto straight 6 half the motor was inside the car with you and the 428 there were about 2-4 cylinders in car with you and he had a big following at our little drag stripe with the straight 6 300 Ford everybody knew the Pinto was warming up for a run and everybody would run to the fence to watch him go because there was not any 6’s on that track but for the life of me I can not find one of his ticket that printed out all the speed reaction time 60 ft mark. A great time for a guy built this car from scratch by Leroy Horseman !

Heck, I would’ve kept my 98 Jeep Cherokee limited 4 L if I knew I could run that much horsepower.

Thats badass🤘🇺🇸

Dang!!! Now, to share with all the folks that call the Jeep engine a "tractor" engine, lol. Amazing work guys!! Building a Stroker now, not like this, but maybe one day? Lol A reproduction Rick Mudge motor would be sweet, too!

impressive

You have been a huge miss my friend! How’s the corvette coming along? It’s great to see your still doing well! A awesome video as always!!!❤❤❤❤🎉🎉🎉🎉

Love seeing I-6's making ridiculous power. They are almost always known for being insanely stout; so why not?

Awesome! I Drag Race a Chevy 292! I have talked to you Jeff...thanks!

Back around 1967, AMC had a turbo-charged inline-six car at Indy. This same basic engine design, I believe a 199 cu.in. stock block. They wouldn't have believed what you guys did, here. Totally amazing. Wish you guys good luck.

Sounds like its having some spark problems, but awesome job! Almost 30psi on a stock 4.0l block and it lived to tell the tale, thats incredible.

Love seeing a good ol American Motors 6cyl making extreme power that's crazy awesome. Can't wait to see how that Rambler performs. Great job on that build. Could you see if u could persuade Kieth into building a similar 2.5 4cyl ? Would luv to know what that number could be. Thanks for the videos there great . Buck .K.

ENGINE!!