Katech_Zach

We just finished up tuning this 2017 Grand Sport with Katech Street Attack 427 LT1 dry sump engine and it made the highest horsepower of any LT1 natually aspirated car to date. Look for a picture thread on the car when it's finished as well as a professionally produced video we're working on.



Photo by Andy Perry

bigsapper

village idiot

Man, that's a lot of work to make less power than an LT4

(Not knocking it- sad face because for people who do track days, supercharging isnt a good option).

bigsapper

Or you could look at it as a new baseline for supercharging.

Snowwolfe

What did it cost to reach those numbers?

Cordes Performance Racing

this appears to be to the wheels which mean's it's making a lot more than a stock c7z.

I will say it looks like the throttle body started to close up on you on the hit based on the dip in the tq there.

blue_bomber697

If that number is to the wheels, that's awesome! A crazy powerful NA motor! Good work guys.

village idiot

Doh, didn't think of that for some reason! I saw it outside the car and thought chassis dyno. Good catch!

If it's a manual, that's about 100hp on the LT4. Even more if it's an auto.

ajrothm

It clearly states rwhp twice in the title....and the dyno chart is on a Dynojet dyno which is a chasis dyno so.... Yeah its making 100 more then an LT4 at the wheels...Pretty killer power.

I'd love to see pics of the engine internals and the heads...

627 rwhp and a couple hundred less pounds then a Z06......car is gonna run hard.

Katech_Zach

Engine pricing can be found here:
http://katechengines.com/performance...gine-packages/

Katech_Zach

See here: http://www.superchevy.com/how-to/eng...d-performance/

Snowwolfe

$20k plus? And no warranty if you use it on the track? To rich and risky for me.

BooSSted

That's crazy power from the LT1 .. Very impressive!

Katech_Zach

Thanks. We have even crazier stuff in the works.

blue_bomber697

Get this motor into a Grandsport and you have one of the most Track capable cars on the planet outside of a full race car. And will look stock. Yes it's expensive, but that's one hell of a motor.

village idiot

I don't think people are buying this for daily driving.

For those of us that road race, NA is the only option right now. It's also about the price difference between a GS and a Z06.

123sugey

$65k Gran Sport + $20k NA motor = $85k worth of fun .... same starting price of a Z

Snowwolfe

Do not doubt it is worth it to some. But the $20K did not include swapping the engines. Plus it cost more without a suitable core exchange. Not trying to knock the product. I just didnt have any clue a build like this cost so much.

davepl

It'll be no easier to cool this 700hp+ NA motor in a GS than it is to cool the 650hp LT4 in the Z.

It's not like there's something "wrong" with the LT4, it's the cooling system and frontal inlets, which are the same on the GS.

I think it's amazing they got this level of HP out of the LT1, and similarly amazing that it's still a couple of hundred pound feet of torque short of the full-warranty LT4 down low.

Pick your poison... First world problems, baby.

Katech_Zach

Here is a video of Andy Pilgrim driving it around M1 Concourse on a hot day in July.



Here is a video of Andy Pilgrim driving it around the NCM track.