Big Block 8.1L - C8 Corvette Engine Swap Update “Will it Run?

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Larry Hofer is a notable figure in the Corvette community, recognized for his innovative work and expertise in modifying and enhancing Corvette models. He operates a specialized Corvette shop, focusing on high-performance modifications and custom builds. Hofer's shop is renowned for undertaking unique and challenging projects, such as the groundbreaking conversion of a C8 Corvette with a massive 8.1-liter direct injection big block engine. His work exemplifies a deep understanding of automotive engineering and a commitment to pushing the limits of what Corvette platforms can achieve. Additionally, Larry is a published author and has written several automotive technical manuals over the last 30 years, further establishing his authority in the field. He also offers a high-performance line of 8.1L cylinder heads, intake system kits, and other products for GM big blocks through his business Raylar Engineering. For more information, visit
Raylar Engineering (www.raylarengineering.com/).

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21 май 2024

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Комментарии : 143

@nickb289 27 дней назад

What will we do when men like Larry are gone. They don’t ask why, they don’t think about limitation, they invent and create what others can’t imagine.

@jmooch59 27 дней назад

I will continue to carry the torch

@lukehoza9571 26 дней назад

Come on dude what sort of attitude is that? Get out in the garage and do something

@4familyman 25 дней назад

Plenty of us doing interesting stuff and documenting it. Also, you can too! Just pick up a cheap welder and a cutoff wheel

@andrewmontgomery1763 22 дня назад

I mean, there’s a couple young dudes who made a 4V Ford 6.8L V10 and are putting it in a modern Lincoln… sooooo yeah people are still (and undoubtedly will continue) to do really incredible projects.

@JohnnyDanger36963 14 дней назад

he's not woke.

@texasmetal8513 27 дней назад

This by far the most exciting gear head project I've seen in a while

@DIY-V12 27 дней назад

There is no substitute for knowledge and experience combined with determination. Great progress.

@JW-hm6ou 27 дней назад

Larry is keeping Hot roding alive. Really enjoy seeing this makes me happy. Thanks Larry Hoffer!!!

@jtb3797 27 дней назад

There is no replacement for displacement. Excited to see this masterpiece on the road!

@Sergeantgrunt 27 дней назад

Weeelll, yes there is. It's called a TURBO.

@Ckcdillpickle 2 часа назад

@@Sergeantgrunt So... what about a bigger displacement engine with a turbo...

@rjung_ch 27 дней назад

Can't wait to hear it come to life, thanks Greg 👍💪✌

@GregQuirin 23 дня назад

It has a heartbeat, Live scantool data is present. Larry is having to fix a few high pressure fuel leaks first before attempting to start it up. We will have the cameras rolling.

@ryanturner8318 27 дней назад

Larry you probably have met or talked with my grandpa Pat Devincent from Ohio. He was a lead engineer for the corvette from the very beginning. He had also worked on designing the fiberglass leaf springs, air bag and a few other things for General Electric since they were originally are a parent company of GM.

@Sandiegosunshine 27 дней назад

Fuel pump power control module is what that is ✅

@shawnwalker8509 26 дней назад

That right

@GregQuirin 23 дня назад

Thanks for the info!

@CanIbeFrank 27 дней назад

I completely get what he's trying to do by putting a big block and convincing the car it's still stock but it would have been amazing if it was manual swapped. A manual big block c8 would be epic

@kevinvanneste2500 27 дней назад

I think it's a great idea on paper but where to put the shifter and cables for the link... The computer would be fully independent and all the other stuff you would incounter that is not going to work or be compatible... Sweet idea I would love one

@jacobm2625 27 дней назад

@@kevinvanneste2500I feel like you could probably route either cables or hydraulic lines for the shifter almost anywhere you'd need to. An old tr6070 out of a C7 could probably get modified to work in the C8, too. I am not super familiar with the platform, however, so I could be totally wrong.

@daltonhanleyjr4142 27 дней назад

@kevinvanneste2500 I think with an adapter plate, he could use the transaxle, shifter, and shifter cables with slight modifications from a Lamborghini Gallardo/Audi R8 since the cars are very similar chassis wise with the C8 Corvette.

@randoawesomemix9501 27 дней назад

And what manual transaxle that's designed JUST FOR THE C8 would you use?

@daltonhanleyjr4142 27 дней назад

@randoawesomemix9501 There isn't a manual transaxle designed for the C8. Hans Juecter, the lead engineer of the C8 said a manual transmission option was never a consideration when designing the C8. So one would have to improvise and create the option from scratch. Using existing parts from other OEM manufacturers and modify to work.

@Flash-FX 27 дней назад

Space Shuttle plumbing and stuff...love it!

@yobringitondown5565 6 дней назад

Hi Greg! Nice meeting you today. It’s Greg, the guy with the 240Z. Can’t wait to see if you guys got that engine running. Waiting.. 🤘🏼👊🏻🙌🏻

@GregQuirin 5 дней назад

Nice meeting you Greg! We made great progress today on the 8.1 C8 Corvette shortly after you left. I will be posting a video with the news and results here shortly within the next day or two. Stay tuned!

@bobroberts2371 27 дней назад

Check valve in the fuel supply. I'd expect the factory manual to have a theory of operation explaining what it does. I'd expect that the check valve prevents vapor issues during a hot soak.

@FunCityFrenchus 27 дней назад

Thank you for documenting this project. Can't wait to hear that Big Block fire up!

@thehomelessproject3784 27 дней назад

These guys are old school geniuses they don't make them like this anymore 😮

@outsider7658 24 дня назад

There was only a limited numbers of guys, not asking "if", it`s possible, but did it anyway. Just sorry there are so few of us left! 🤣 Just a joke!

@TheWolfMatt 15 дней назад

GM will need another variant of the C8. The "Thumper" edition C8 Corvette. This thing is going to rock.

@mohanperformance.enginerd.1308 26 дней назад

I don't get why anyone would want to do this? But its an epic effort. 🏁

@AllSpeed 27 дней назад

this is such a cool build. if he needs more fuel, maybe he can run both direct and port injection like Toyota's D4S injection system.

@JoseRivera-ym3wj 25 дней назад

Dummy injectors? I know that there's more potential on that big block if fueling with the direct injection system becomes the limiting factor. I don't know anyone that makes uprated direct injectors for any gas engine. The dummy injectors could be easily used as secondary injectors when more fuel is needed. Plus there's the benefit of having cleaner intake ports and valves, as the gasoline will keep any carbon deposits from accumulating. I know that PCV technology on direct injected engines have improved a lot, but it would be some added insurance in this setup. Maybe a stage 2 phase of this project. This is an amazing engine swap project as is. Can't wait for the other spectrum of C8 engine swap projects: Rob Dahm's four rotor C8 as tribute to the Aerovette concept, which had a four rotor engine.

@scottm7341 26 дней назад

Oh cool, I didn't realize he's the genius behind Rylar.

@GregQuirin 24 дня назад

Yep that's Larry

@bobbiduncan3119 15 дней назад

Mr. Larry Hofer looks so much like my dad. My family sent a side profile and we thought it was my father. Looking straight on, you can tell a difference, but wow, that's insane. 😂

@spdcrzy 20 дней назад

With twin turbos and BOTH direct AND port injectors, this would be a monster. The fact that they were able to integrate so much of the 8.1L is awesome. It's a brilliant approach to today's tuning challenges: change everything about the engine that's ONLY mechanical (like ALL the engine hardware itself), but maintain everything that has an electronic signal for a computer to read - so all the old sensors plug into the new metal. And you can even ensure emissions compliance! Pretty damn cool.

@johnnyrock852 23 дня назад

Dude is awesome! Love someone is still doing this sort of thing, especially in Ca. Now we need a CARB legal version.

@drfoo1957 27 дней назад

Are you going to put ceramic tiles on it for re-entry?

@mcfast52 25 дней назад

If that box at 5:00 is made in Mexico it's to control the spiciness of the tacos!

@rebekahfrench5747 26 дней назад

Engine removal everytime it needs a check up..😂😂

@ryanb6658 18 дней назад

That’s what you get when you buy one of those cars

@joef7406 27 дней назад

Thank you, Greg and Larry, for a glimpse into your fascinating project.

@charlesritchel924 22 дня назад

Larry is a fountain of knowledge. Pay attention while you have the time to.

@TheSwaffordHomestead 27 дней назад

What a huge project! But when it runs, all those hours of work & planning will be worth it! Keep us updated, I want to see this assembled & fired off!

@mikesmith7447 27 дней назад

Thanks for the update.

@johngato737 26 дней назад

Hands down my favorite channel.

@GregQuirin 26 дней назад

Thank you for your kind words!

@timsgaf 27 дней назад

very cool. Thanks guys.

@DonCarlos-Medellin 26 дней назад

Super excited. Thanks for sharing. Let’s all hope the rest of the project goes smoothly. 69 year old gear head from San Diego, now expat living life in beautiful Medellin Colombia.

@WilliamBurdine 27 дней назад

Can't wait to hear it fire up... I am in La Mesa, so give it a few good revs, I'll be listening !!! LOL

@johnathongulley1146 21 день назад

Love this build!

@benrossbach6501 27 дней назад

Dam impressive. Thsnks for sharing

@WildEngineering 27 дней назад

4:05 lmfao i love the honesty

@regsmith7604 27 дней назад

My favorite Corvette color 👉🏽Arctic White😊I can’t wait to hear that 8.1

@ldtenenoff 27 дней назад

Wow great vid man ur and we r so lucky to have passionante folks whom r just Kool as alll get out thank you for sharing this great american corvette god with us folks! wat a treat

@herculesinwyoming 27 дней назад

Outstanding!!! ❤

@8marcrara11 27 дней назад

Very good!! Thank you ⚡️⚡️👍👍

@geoffhurley8103 25 дней назад

Amazing!! More, please!

@GregQuirin 24 дня назад

More to come! I promise!

@fredericrike5974 27 дней назад

Mr. Hofer, for seeing into those dark holes and such, a borescope would be ideal- a tiny camera/light on the end of a flexible semi rigid cable that you stick in the hole and look at the image on a CRT screen or maybe your cell phone. I can't wait to hear this baby roar! Let 'er eat!

@farmerkevin 24 дня назад

Big block baby!

@CanIbeFrank 27 дней назад

Amazing

@Sleeperdude 27 дней назад

Didn’t expect the F bomb

@jacobm2625 27 дней назад

That's how you know he's a real one

@joshjones3408 27 дней назад

Oh my ....😱😱😩😩

@lasskinn474 27 дней назад

great honest content man. edit: will the restriction and check valve even out the pressure of fuel going into the direct injection pump? (pressure pulses from the 'low' pressure pump). are they using that pressure in some calculation on the stock efi to calculate what the pressure will be after the high pressure pump?

@lanceneuman9528 27 дней назад

Thanks Greg

@GregQuirin 26 дней назад

Your welcome!

@TheJjrjr125 День назад

This is so interesting! Thanks for sharing! I'm curious if there may be any future plans for the original engine?

@RevengeAvenger 27 дней назад

I would absolutely love to visit you guys when I come to California. I'm not a youtuber.. just curious and amazed at yalls abilities.

@williamcornell9744 22 дня назад

But Uncle Larry!! Will it run!!

@CarHound 11 дней назад

love it

@dannymitchell6131 22 дня назад

I love this guy "What in the *** is that?!" Thanks for filming dude.

@bullast2046 19 дней назад

I’m subbed, as of 4:00 My man

@joshuaelizabethfoster6276 19 дней назад

At Larry I'm sorry about the summit report I made, sort of...This is a 10000$ kit when your done. I still think you would have had less headaches from people dropping your aluminum heads over those arp studs, then complaining about aluminum chips in the sealing plane and block, if you had simply sold blank heads and offered the head studs as an up sale. More sales at 2000$ reusing stock valves train with a cheap head gasket/stud kit with less troubleshooting. But this is totally what the 8.1l needs to stay current THANK YOU FOR YOUR WORK!

@charlesdelaparra5997 27 дней назад

Pretty awesome project and a lot more involved than I could have ever imagined. 2 questions. Is it going to be offered as a swap package for willing customers and will it be cheaper than a Z06?

@P-J-W-777 13 дней назад

Put a bigger one way valve on that fuel line to get better fuel flow. Like you said they put it there for a reason but you should easily be able to replace it with a bigger valve.

@TechScottBrown 24 дня назад

The check-valve is in place because of how the HP pump works it will bleed a small amount of pressure back on the feed line. You will likely need a larger orifice check valve. Maybe check with what the Z06 has?

@cantdriveslo 23 дня назад

Now that's the type of mechanic I would want working on my cars

@Mattmazz77 27 дней назад

There's nothing like a big block. All the twin turbos and supercharged c8 immediately surprised no 1 has done this yet.

@masen1458 18 дней назад

My guess for the check valve in the fuel line is for when you shut off the car it keeps fuel pressure at the high pressure pump.

@beaches2mountains230 8 дней назад

SURE WILL BE NICE HAVING THOSE PORT FUEL INJECTORS WHENEVER THE OWNER GETS USED TO IT AND DECIDES THEIR "BORED" WITH IT LOL..I REALLY THINK ALL DIRECT INJECTION ENGINES SHOULD HAVE PORT INJECTION AS WELL TO AVOID THE CARBON BUILD UP INSIDE THE HEADS AND BACKSIDE OF VALVES..SUPER COOL BUILD AND CANT WAIT !! NOTHING SOUNDS BETTER THAN A BIG BLOCK CHEVY WITH A HEALTHY CAM! AND THIS ENGINE ONLY WEIGHS WHAT 120LBS MORE THAN A LS ?

@robertphillips3078 13 дней назад

Sensational effort 2 get this Job done . Interesting 2 see how it drives especially around corners with all that xtra weight . If l had that kind of $$$$$ l would have gone 4 a 441 cu inch Windsor 9.5 deck height. With SBF Hemi Heads from Hammerhead Performance. And the ring Dustin @ Whipple Superchargers & beg him 2 re disgn the base of his 3.8 ltr superchargers 2 fit . Obviously 2 make it all work beautifully would be coil near plugs & crank trigger ignition & billet block ,heads , crank, rods , pistons . And dry sumped . The special request 2 whipple would be asking 4 there cupronickle intercooler core ( marine use l know ) but should assist 2 give u big HP & TQ on 93 Octane.

@jerryl3270 15 дней назад

What about a high pressure relief valve for the return line? I do the same thing on the diesel. On the fuel rail

@nrakma 15 дней назад

More weight and a higher CG is the formula?

@user-qi7pf7zg5z 16 дней назад

Personally I would do a 632 bb chevy those 8.1 are heavy. Specifically In a vette. But those 8.1 are torque monsters.

@rogerrolex6981 11 дней назад

When is it going in the car and when are the shake down runs 😊😊👍👍

@zmanmd1641 18 дней назад

Most GDI engines approach diesels of the same size in maximum torque output, so that will be interesting in how this engine performs. One of the big hurdles with adding power to a C8 is the transmission is limited in how much torque it can accept. There are clutch upgrades and half shaft upgrades used to help this, but the internals of the transmission are the ultimate limit. How much torque will this DI 8.1L make and will the transmission be able to take it?

@martinpal1764 25 дней назад

Is there a base line estimated HP for this build?

@PederEllefson 16 дней назад

Check valve could be to prevent back flow if an injector fails.

@aDumtreeF85 15 дней назад

This confirms that there is no replacement for displacement.

@truthbknown8174 27 дней назад

I I really enjoy watching this progress. It does concern me all the parts they do not know what they do or why; particularly the 3/8” fuel check valve. BUT I want to hear it run

@jimclarke1108 27 дней назад

The only way

@davidrutledge6033 10 дней назад

The c8 Connan version big block instead of the c4 corvette v12

@jamesgeorge4874 16 дней назад

It's his project, I cannot imagine taking a 475 Lb aluminum engine out, to put a 600+ lb iron block engine in, weight is a bigger enemy, than power, in a mid-engine high performance car.

@xozindustries7451 25 дней назад

Is he going to run a level sensor on the dry sump oil tank?

@GregQuirin 24 дня назад

Not sure I will find out for the video. thank you

@robertphillips3078 13 дней назад

Am very suprised that the headers aren't jet hot or ceramic coated ....

@RobertWelchman 27 дней назад

Love the project and absolutely respec the knowledebase here. Dumb question... why not upsize the check valve?

@Mercmad 27 дней назад

a bit of difference to Granddads old Ford flattie. 😊😊

@davidaarons2488 27 дней назад

First thing I thought was ABS module?? but could be as ya said coolant fan ?? Great progress though, it will be awesome, Thanks

@reedjacksonmaccom 27 дней назад

its magic 😂😂😂

@Rustynoname 27 дней назад

I wish Gm would make a flat plane high reving big block. lol.. 4.5in stoke - 4.5in bore and figure out a good deck height for perfect rod length and stability.. VVT-DOD-Overhead cam-Direct injection.. 9000+ rpm 572ci lol or a v8 designed like a street bike engine that revs 15k

@Whance_Chilkins 27 дней назад

A 572ci flat plane V8 would vibrate like crazy at high rpm

@Rustynoname 27 дней назад

@@Whance_Chilkins can you explain? Most flat plane or high rpm motors use close to same stroke/bore size. You would be taking a 5.5L and upscaling it basically. Why would that vibrate like crazy

@jareknowak8712 27 дней назад

The weight of the pistons and stroke are way too high for durable 9k rpms. New Ferrari "12Cylindri" is a 9k engine, but it has 6.5L in 12 cylinders.

@stephencurry8552 27 дней назад

Hot Rod magazine is no longer a monthly. Sad.

@MartinMcMartin 27 дней назад

That's cool, like an old VW you drop the entire power unit out.

@michellee8369 27 дней назад

🇦🇺

@miketaylor6282 12 дней назад

It’s crazy to think some GM engineer thought it was ok to locate wiring harnesses, and control modules in the wheel wells. 04:10 Oh but wait, there’s a splash shield keeping it safe and dry. Come on GM puff, puff pass! 🤦‍♂️🤯😡