Katech "Street Attack LS7" 640hp 555 lb-ft + dyno video screaming 7140rpm
 

Here is our "Street Attack LS7" crate engine

Engine: LS7
Displacement: 427ci
Heads: Katech ported LS7
Pistons: Katech forged LS7
Connecting rods: Katech rebushed LS7
Cam: classified :secret2:
Springs: Katech high lift LS7
Retainers: Katech ultra-light
Induction: Stock LS7
Exhaust: TPIS headers


http://www.katechengines.com/street_...attack_LS7.jpg


Dyno video. Turn your sound up and watch it scream 7140rpm!
http://www.katechengines.com/street_...yno_1_0001.wmv

Great vid :D
Have one of the "Track Attack" version??

Katech "Street Attack LS7" 640hp 555 lb-ft
 

What is the cost on that beast?

Great vid. I'm curious on the price as well.

Edit: nm I just saw the other post.

Not yet. I will post as soon as we do.

$8400 with supplied LS7

:eek2: Well not as bad as I thought considering what you get.

If you have the Sleeper version, screaming at 8000, I'm sure you'll get many hits!! :D

Is that the idividual cylinder A/F ratios on the bar graph? Are they ususally that far apart?? Is there any gain by matching those A/F ratios as close to eachother as possible??? Bad A$$ engine by the way.

Yes, they are and they are always that far apart.

wow... talk about torture test!

first part of that video sounded like a top fuel car running its clutch in. Very nice.

Are the springs and retainers being sold separately and will they work well on stock LS7 heads and valves?

Thanks,

Charlie

Yes, the springs are sold seperately and can be used on stock head. Our primary reason for using them is for a high lift cam.

This may seem a little off track for such an expensive engine but can it sustain 150HP or 200HP of direct port nitrous blast while still lasting a good 40,000 miles or is this far fetched for such an already extreme powerplant? :emb:

great numbers! What do you think that would be on a chassis dyno?

No disrespect, but LG is getting 620rwhp compared to 640 fly wheel hp, with just head work, cam, and bolt-ons on their modified LS7. I know you guys are tight with GM and the C6R race team, but those prices listed in your other thread seem higher than even lingenfelter charges. :eek2:

also little 13/4 inch headers and full exhaust.

I'll post as soon as it gets on.

This engine has cam, heads, and headers. It makes 640 at the crank. Catch my drift?