BUILD VIDEO - Katech 700hp Naturally Aspirated 427ci Corvette Grand Sport road race car

[@genericdenizen1]

Bought a new 2019 Corvette Grand Sport, with a MANUAL TRANSMISSION, and it’s a great car! Huge power, fantastic handling, and with the magnetic ride control, the car goes from track stiff to cruising smooth in an instant. My wife even asks when we can go for drives in the Corvette Grand Sport, and that rarely happens with my NSX. Buy one, if at all possible, life is short.

[@carlos64030]

Now THIS is the kind of content I like to see. GOT DAMN... 700 naturally aspirated horsepower is freakin' impressive! That 2 month turnaround time is super impressive as well!

[@tylercouture216]

all motor engines are capable of making any amount of horsepower why do people still act shocked about that in this day and age

[@Cardiakk]

@Mr. TAMW Stop trolling. Your 1.5 liter can't bring in enough air and fuel to make that kind of power and even if it did, it would blow up instantly.

[@tylercouture216]

@@Cardiakk lmfao you are trolling but that was honestly pretty funny not you though you're an asshole

[@swansmeister]

@@tylercouture216 No they can't, maybe on your planet, N/A cars are hard to tune and expensive to, it also just stops at a certain point whilst a turbo engine the sky is the limit.

[@ShauninaV]

@@swansmeisterincorrect lol

[@DanielOrtegoUSA]

Impressive build, and it's refreshing to watch a build video without BS punk rock music.

[@alanstover3663]

This is the perfect c7

[@stephenlutz835]

Incredible build by obvious pros. Well done and dope soundtrack too.

[@stephenlutz835]

mike force ooooh burnnnnnn.

[@stephenlutz835]

mike force dope humor. ;)

[@JackalCars]

Deadmau5 + Vette engine build = me happy

[@stealthhtm23]

at the beginning, I was like wtf is this horrible noise. then my toes started tapping 😅

[@JackalCars]

​@@stealthhtm23Exactly lol

[@SuperMegaCliff]

The fact that no power tools are used shows your quality of work. Amazing build

[@bstevermer9293]

SuperMegaCliff Why is that?

[@bloodysinner9456]

@@bstevermer9293 - Because it's hand built.

[@TheBikemaster94]

AMG uses robotics and power tools on their special "hand built" engines but also computers to measure out tolerances and even the smallest details. I trust it more than a shop that does without the tech

[@RoadKing-269]

The best part is the car is very quiet at idle...then BOOM!!! Engine and exhaust sound amazing, almost C8ish while revving.💪🏾💪🏾💪🏾💪🏾

[@DiddyBop_]

700 n/a HP? shut up and take my money

[@dagoose3829]

Angel Brahh aahhhh yeah that’s more than 550 wheels hp. More like 620 to the wheels

[@OscarMaris]

that's nothing. a ferrari 812 is 790 hp.

[@patriotsfan1236]

@@1SLOWCAT but it's NA and that is still alot of power in a light car. Faster than a hellcat forsure which is awesome because its NA.

[@patriotsfan1236]

@@1SLOWCAT and yeah that 600+ to the wheels lol... 550 would be like 640 crank up.

[@yeetusdeletus9]

@@OscarMaris that car has 4 more cylinders and is at minimum 4 times the price of the grandsport

[@nicklaw2807]

I really like the styling and videography of this video. Keep up the good work.

[@Ganbala]

Best move.... we tired from Supercharger and Turbos ... we need something like this

[@zipzap4706]

I am impressed with the wrenching - using hand tools - something very organic and old-school about it. A real hands-on connection. Awesome!

[@maximusvonce1381]

All motor is badass. I would want one badass supercharged monster and one badass all motor monster. Best of both worlds

[@tuneupone1]

Very professional build and all the attention to detail is very impressive and your shop looks immaculate!

[@DurtymaxJack]

Really enjoyed this!

[@KatechPerformance]

Durtymax Jack thanks, buddy!

[@justingriffith8486]

Wet is dune to the car how got my car dune Be you.

[@BartBencosme]

What intake manifold is this? is it available for an ls3? Music is great BTW

[@justingriffith2991]

@@KatechPerformance he

[@justingriffith2991]

@@KatechPerformance he cen wick in my c7

[@sarkomazmanyan9813]

This was one of the coolest build videos I’ve seen

[@The_Drive_Inside]

Exactly how it should've came from GM. So damn cool!!! 🤘🏻

[@Ladco77]

Boost is great, but I love seeing how much power you can get out of a normally aspirated engine. The LS7 is still one of my all time favorite GM engines. Nice to see a big cube NA Gen V engine! I would have loved to get a good listen at the start up and idle, though.

[@johnnymossville]

700 NA HP? Now that would be fun to drive. Nice work!

[@cali2468]

Chris Harris The hell are you talking about!?

[@Dynoids]

yeah, what? lol

[@SoI_Badguy]

Chris Harris Wtf? What planet are you from? The grand sport comes with a 376 from the factory, and makes 460hp. Not 700+.

[@speedlife301]

Lol the stingray or grandsport is a 376 compared to a stroker engine 427. Anyone who knows anything knows that a boosted car needs more power to beat a n/a car with similar power. Roots chargers run out of power at redline or just before and n/a engine is lighter = adds weight over the front axle80-100 pounds not including the weight from chiller killers , meth setups etc that you will need to keep the iat temps down so more like 150lbs or more added to front of car =undesirable no heat soak, more reliable and consistent (can be hot lapped and do it over and over again and run laps hard with out having timing pulled or going in limp mode, plus they pull hard up top and have a very strong linear predicable powerband which is key for auto cross and road course racing and still fun on the street for bracket racing. Give me a 700 hp n/a engine over a 750 supercharged engine any day of the week. You can do drag, auto cross and road course and kick ass at all band if someone wants to race for money you can always throw a 100-200 shot of nitrous on to of the high compression n//a that the bottle can easily be removed when you track your car that will kill any boosted car.

[@FredsFullThrottle]

WOW, excellent video. I have a 17' GS and didn't realize you make built motors like this. Gonna have to do a little homework!!

[@BartBencosme]

You guys should make a lot more videos of builds like this

[@zr1chris1]

So sick! Need a quality shop like this in South Florida.

[@abdjr.247]

That was so beautiful *wipes away man tears

[@Lesevesel]

Always interested in NA upgrades...esp from Katech. Great job, gents!

[@kharisjones6136]

"If you want it done right. Send it to KATECH". TRUE STATEMENT!

[@Donald_Turnip]

If you want it done pretty, send it to KaTech. :p

[@lukeludwig1599]

like the ls7 valve guide issue ? No thanks.

[@ZX6R2KGT]

@@lukeludwig1599 How is that Katech's fault or even related to this engine?

[@noahsandoval1390]

You have a very impressive facility. Its easy to see why you have such a great product

[@xbwang87]

With that much power, the driver better dominate everyone

[@shunsato6621]

NA 700hp manual clean build you guys are amazing!

[@JK-li7fp]

Finally a manual. I dont see those enough anymore.

[@jrvbamafan1]

@mike force we see plenty of pansy ass whiners that always dog manuals though and praise autos because "nobody can shift as fast as an auto", forgetting the fact that sometimes its about the actual experience of driving a car instead of pushing the gas down and letting the car do all the work for you. It's cool though, my parents and other old people like autos too. not everyone is meant to actually be really good at driving, so they have to make autos for yall....lol

[@jrvbamafan1]

@mike force care to put your money where your big mouth is. I know for a fact I can out drive you. You let me know what track you want to get your feelings hurt at and when. I'm in north Alabama by the way, so put a few grand where those twitter fingers are, or else shutup

[@jrvbamafan1]

@mike force its always the goofy ass people with no profile pic trying to talk shit and troll. Go back down to your ps4 in your moms basement. I'll beat you on a track, dragstrip, video game, foot race....it doesn't matter. Got an entire trophy case full of wins from events around here. I'll gladly make you another victim

[@Shep-dq6fw]

Awesome video I got to come by in person on your next built keeping them coming

[@papocam3853]

This is EXACTLY the Engine the CORVETTE GRAND SPORT should have, with the Z07 PACKAGE. AWESOME CAR! !!

[@alanmac8807]

Australia needs Katech

[@tyburcjusz]

After only a few minutes I was hooked! I mean really, the level of pure craftsmenship when putting this engine back together proved this is some legit s*@$ :) massive props guys!

[@justintimberlake9347]

What an amazing build. I like your shops attention to detail and the obvious love for the job. Great work!!🍻🍻

[@chrisauten2039]

That rear diffuser is sweet !

[@KatechPerformance]

Thank you. It is available in our online store.

[@robinmossing3399]

Best video I have seen with integrity!!!!!! Amazing company.

[@tjmoneybags]

you just talked me out of a C7Z06....I don't want a blower motor....I LOVE the LS7. I want NA 427 in a C7 and this is the answer.....BRILLIANT. This should have been an option at the dealer like the callaways.

[@realtalk4689]

Mechanical poetry.

[@sumatai1]

Awesome video!! Well done!

[@ReticentIndignation]

Wow, this is truly badass! For a plebian like myself, 32K for this is beyond me, but had I the money...Oh yes!

[@hugochavez4382]

These boys seem to know what they're doing. 😎

[@kirkendicott5521]

That was one amazing build and video.

[@paulhewett303]

Incredible team @ Katech Jason !! The very BEST ! All of you should be very proud of the finished product you guys deliver to the clients of Katech, job well done as always brother, take care, Happy Thanksgiving Katech team of professionals.

[@basedjorts]

Imagine this in the C8. Katech needs to make it happen.

[@KatechPerformance]

I agree. We just need to be able to tune it first.

[@inlinesick]

Hollyshit!!! clean work! I wish i had the fund to build a 427 N/A GS to go along the Z06!!

[@spdcrzy]

I'm a die hard GM and N/A fan, and seeing 100hp/L out of a 427 is always cool. I know you guys stopped making Corvette race engines after GMPP brought everything in house in 2010. However, I hope that your work with Pratt & Miller still created a strong bond. I have several questions, the last of which is more of the blurred line between race and road engineering. 1) When it comes to the Gen V LT1, how long do you think it will take the aftermarket to come up with a true tall-deck block with direct injection that will support 100hp/L and 500ci? The LSR-TDRC2X block from Concept Performance has been hailed as the next big step for making reliable power for the LS platform - and it supports up to 505ci SAFELY. Obviously with the LSR block reliability is key, and it supports 505 ci (4.180"x4.600") safely before the wall thickness is no longer sustainable. But it's still an LS-based block, without direct injection. Also, the tall-deck version only weighs 120lbs, which is kind of crazy. A tall-deck production LT1 (LT7?) block that weighs 120 pounds would be sheer insanity. 2) Going back to the LS architecture, an engine builder (who shall remain unnamed) using what looked like a Dart block, old-school intake, made nearly 870 hp/740 lb-ft out of a 'conventional' 502ci (4.165"x4.600") build - and it was meant for a STREET DRIVEN car. They posted the dyno run on KZbin only a few weeks ago, and it looks entirely legit. What kind of cam and compression ratio would support such a ridiculous amount of torque AND power, even with a huge stroke like this? 3) Everybody talks about drivetrain loss and the different ways to calculate it. You lost about 76hp from a 700hp build, so I'm gonna round it and call it 10% loss total. Most people land somewhere between 8 and 15 percent - but obviously it's different for every engine, transmission, and drivetrain package. Which transmission did you get that loss with, auto or manual? And if it was the manual, how much more or less power and torque would you see at the wheels with an auto (or vice versa)? 4) Lets say we take the aforementioned 502ci crazy engine, and we drop it into a car running a CF driveshaft and a 9" rear with 3.00 gears. What would be the difference in horsepower and torque at the wheel with a traditional manual (say a beefed up T56 Super Magnum) versus a 6-speed paddle-shifted sequential box, like something from Albins, Holinger, HGT Precision, or the like? And would it be practical (not necessarily comfortable, but practical) to run a sequential on the street assuming that its torque capacity exceeds 1,000lb-ft? I've heard that the HGT boxes are the quietest and have barely any gear whine - plus they're EXTREMELY light.

[@brandonclark8736]

I would absolutely love a chance to drive that car.

[@zrosko256]

So awesome! Enjoyed watching this. So wish I owned a Z06 and you guys do the work on it.

[@kristiadihartanto2623]

700hp N/A... You guys alien!

[@darwinLee81283]

This is the PERFECT Corvette. All black GrandSport with Steel Brakes. 700 N/A horsepower. MANUAL with Forgeline wheels. Omg. PERFECT. #SAVETHEMANUALS

[@JordanDecarie25]

40psi of oil pressure at 4800 rpm. These motors sure are some voodoo magic

[@KatechPerformance]

Funny you should mention it. We've seen less than desirable oil pressure in dry sump LT applications, so we came up with our own oil pump that we just released. store.katechengines.com/high-capacity-scavenge-high-capacity-pressure-lt-dry-sump-oil-pump-p812.aspx

[@bsfunk44]

Sweet frosted tips bro..

[@Mr7O5]

Keep these videos coming !

[@stevenbeaubien]

I can't wait to get my GS so I can send it there and only 35 minutes away.

[@sladeb6036]

That house they drove past , just damn

[@KatechPerformance]

That is the Edsel Ford estate.

[@MrOscar316075]

I am in love, i will get a grand sport and send it to yall pair perfect with my c6 z06 I would like it with a big cam, ported heads and lots of NA power. You guy are really professional i am serious i will get in contact

[@jalloor]

Amazing. Why didn't Chevy go this route with the Z06? You guys are awesome.

[@dannytello25]

jalloor probably smog

[@ThisGuyDrives]

There is no way that car is fun to daily drive. With 700 N/A, I imagine it's gotta have a pretty nasty cam that would make city driving no so fun. I could be wrong though.

[@ZarosianEos]

Dan The Man That is also what I heard. Apparently they tried to go big naturally aspirated but nothing with the power they wanted passed emissions

[@m1ndtr1p]

jalloor Too expensive, too time consuming, too difficult to reproduce effectively and efficiently, and 700 naturally aspirated hp won't pass emissions... Like it or not, but these cars are mass produced, it's the only way they'll make a profit from them... Why bother pushing for 700+ na hp when they can get those same numbers by installing a small and cheap blower rather than wasting all that time and money porting, re-sleeving, fine tuning etc, the power output will be the same, but it'll take significantly less time, money and effort using a blower than going na...

[@gen1c8rs88]

ZarosianEos I heard that the auto-cylinder shutoff mechanism could not stand 7000+ RPM. Even with the 454 spining at a lower rpm than a 427.

[@V10PDTDI]

Love the video and the quality of work is more than evident.

[@500whpSTI]

Great video! This is my dream setup, that's one lucky owner.

[@thecorncrew5981]

Will you guys be doing 427 LT2's for the C8?

[@marcd695]

Now that’s one bad Vette!

[@DanielOrtegoUSA]

I own a 2017 Chevy SS Sedan with the stock LS3. I've been on the fence as to which upgrade to choose. If I were to follow the primrose path by others, I would have a new block cam-ed, ported with internals, coupled to an SC, and tuned as a daily. Conversely, I just can't shake my desire for an NA alternative. This video inspired me with the cleanliness of their shop and how they approached the build with surgical detail.

[@jingos1492]

Always up to you man id be interested to hear what youve done since your comment. Ive had turbos and SC in the past and for me unless your sending it down the track or have a heavy wallet its not worth it. I have got an LS2 VE SS with 490rwhp which is enough for the street, reliable maintainable power with the N/A nostalgia.

[@esteban8681]

God that car is Sooo sick

[@mia1shooter]

This is what the C7 Z06 should have had

[@ddetv8433]

That burnout at the end 🤤

[@fabbas01]

This would be perfect in the new C8.... Wow!

[@darwinLee81283]

So wld a manual

[@fabbas01]

Darwin Carey ehhh. Owned few manual cars. I am ok either way.

[@darwinLee81283]

@@fabbas01 I feel it. But I. Challenging us car guys to keep the manual alive. For all those folks who say it's faster.. We'll that's great and all but I enjoy driving and connecting with the vehicle. I respect if u don't mind an auto. But picture this. U have a dude in this C7 NA CORVETTE manual. Vs someone in a Tesla P1000s. And ur gonna do a dig race. Well who's the real winner. The guy who actually has to drive the car to win or the guy who simply presses Ludacris mode, the brake and Gas together to the floor, and lifts the brake pedal? Perfect example of where we're headed

[@MrPrep91]

Nice build

[@jonienglish3231]

BAM !!!!!!!!!!! KICK IT UP A NOTCH !!!!!!!!!!!!!!!!

[@kirkendicott5521]

Amazing what guys can do love your videos.

[@camonly849]

Grandsport should have came with a 427 to begin with!

[@LamboRich86]

Yes lawd ! Finally a N/A 427 LT1... where those darton sleeves?

[@KatechPerformance]

RHS sleeves

[@georgiafan6618]

Immaculate, professional build. Did you guys stroke this 427 cu in motor prior to this build? I recall GS Vette's are 350 CI? Why go anywhere else - you guys do everything and do it right. Do you port superchargers that are not on a domestic vehicle? Did this Vette receive Haltec engine management? Last one - did you upgrade the clutch assembly? Great video - thanks!

[@KatechPerformance]

The car was completely stock before the build. We achieved 427ci by using our sleeved LT1 block @ 4.125" bore and used a 4.000" stroke crank. Currently our only supercharger porting available is LT4 and LS9. We are working on LSA. The engine management system on this car is stock. The clutch is an RPS BC2.

[@stevenwitt2555]

Now I SEE what y'all cost so much... well done !! I'm impressed ! Y'all hiring ? Looks like a place for me .

[@KatechPerformance]

Yes, we are hiring!

[@LD9user]

More content like this, please.

[@DanielOrtegoUSA]

Very impressive so thanks for posting!

[@speedysbarbershop]

Wow nice work!

[@DennisMurphey]

Street version for a 2014 Z51 A6 with 9,000 miles, ??? Or 402 using L8T crank and Hot Cam and LT2 heads. Retired engineer needs more and loves the C7, maybe widebody rear fenders for wider tires nut Keeping it NA for street??? Thank You, Dennis in Virginia

[@allen4527]

I had a feeling they had to add sleeves, And I wondering when someone was going to build the ZO6 Small Block 427 up. It's a great motor!

[@MICKSHRED]

It's not an ls7 but an lt1 stroked to 427

[@timmietz]

How does power to weight for this car compare to a H/C/Exhaust C6 Z06 with 650HP? How much was this build?

[@emperor002002]

The main reason I want a C6 Z07 is because GM didn't make a 7 liter C7.

[@ChuckBeefOG]

Same. The C6 Z06 is my dream car. Even after seeing the new C8 Corvette. I need an LS7 in my life even if it has valve guide issues.

[@motorsportz8040]

@@ChuckBeefOG Plus C6s look better than those C7 TransAm and C8 Fieros.

[@adamgm84]

that 7 litre sound makes me erect, whereas the 6.2 litre sounds like an old man trying to reclaim his youth. 427 with cam is probably the best sounding v8 of all time, in my opinion anyway, but keep in mind I own an MKIV supra so my opinion is wild and I don't like backpressure.

[@hpkntnw]

I can’t take the music it’s like someone is scratching my cerebral cortex!!!

[@arnoldkevorkov3640]

Professional work

[@halstoncantrelle4500]

This is why I drive a Chevy!

[@sturgeon.striperandsharks6971]

It all looks beautiful I was wondering if after all the working of putting everything back together perfectly to the best of ur ability does the engines have problems where you’d have to pull it all apart to fix stuff or if it’s done right it should last a long time with this much horsepower?

[@KatechPerformance]

For street use it should last you a long time. We offer a 3yr/36,000mi warranty for this standard package for piece of mind also.

[@mchristr]

With 700 n/a horsepower there's no need for the added weight, complexity, and cooling issues with turbos/superchargers. Why is the block cast with "6.2 L"?

[@crombie92]

Sweet setup!

[@saifa6359]

When building an engine like this, don’t you have to run it for like 200 miles with break in oil or so to create cylinder and piston wear patterns before all out dyno-ing?

[@gavsu]

gorgeous need to build this soon do you ship to UAE

[@jonathonflores4937]

There is a heaven

[@jimbo6612]

How many organs does a build like this cost?

[@KatechPerformance]

Fewer than you may think. Give us a call if you would like to discuss pricing. 586-791-4120

[@sullivan5639]

All of them. I actually just sold all of mine and will just be buried in the car once they finish it

[@arnoldkevorkov3640]

The space between the cylinder wall became really thin in comparison to the factory displacement. It's that ok?

[@KatechPerformance]

We sleeved the block to accommodate the larger bore size.

[@hollywoodhustlng4071]

cool video guys

[@bdarney724]

I have decided to take you up on your idea to see what is runs at the track that still will not explain the poor numbers on the dyno,thanks Bob

[@Corsavette02]

I love the music....knew it was Deadmau5 immediately. Listen to this stuff when I polish my vette lol

[@RF_Gh0st]

Would like to work towards this as end goal on my c7 , quick question what header size are you using for this 2" ? Trying to go the route of do it once lol

[@KatechPerformance]

2" is what you want to use with the 427ci packages.

[@robharper6662]

the comments asking how to get that 'sound' for their stock LT1 cracks me up. Yes...just a cam and exhaust. buddy. That'll do it, lol. And maybe another $20,000

[@SM-eu5xl]

Sooo tempted to pull the trigger on this for my 2017 GS... curious how durable it is for 100K miles..

[@KatechPerformance]

S M well, none have 100k yet but for street use that should be fine.

[@vaugr1917]

Would imagine u might need to change valve springs every 15-20k other than that should be solid

[@jpiuvara]

Do you guys knife edge and polish the crank at all?

[@maximusvonce1381]

What compression and octane gas is used in this car. How big is cam. Must be a massive drag race solid roller cam

[@KatechPerformance]

12.5:1 compression, 93 octane fuel. Exact cam specs are proprietary, but it's a streetable hydraulic roller cam. Nice lope but not super aggressive.

[@maximusvonce1381]

@@KatechPerformance 93 octane on 12.5:1 compression. Fcking time bomb

[@WaylonAxe]

@8:54. Is that a house or business?!? Either way, it’s sick. Cool vid

[@KatechPerformance]

That's actually the Edsel Ford house.

[@WaylonAxe]

@@KatechPerformance Thanks for the info. 🍺