Most powerful naturally aspirated C6 Z06 and LS7 - 622 rwhp on E85

[Sticky]

622 naturally aspirated horsepower out of the LS7 V8? That is just absolutely insane power without any boost. It's also making 546 lb-ft of torque at the wheels. This motor is a 429 cubic inch V8 built by Katech with 13.0:1 compression pistons.

That explains why it has to run E85 fuel. It also has a Katech K501 cam, MSD intake, and full exhaust.

Oh, and it goes into a car weighing ~2800 pounds.

Awesome? Awesome.

Halltech ULZ700
3.95lbs/hp 2828bs/715 FWHP
E85 fuel (Pump) Everyday driver
Katech K501 Kavorka Cam (perfect street manners)
Katech Pistons with DLC wrist pins (4.130" 429 cid)
Katech hot honed case
Katech Carbon Fiber valve covers, C6R Coil relocation kit
ARP Chrome Moly head studs and case studs, Titanium bolts and nuts throughout engine
Katech Rod (stock titanium) bronze bushed the small end, H11 rod bolts
Katech High Performance Scavenge Oil Pump
Katech Billet Aluminum Tensioner w/ titanium bolts.
C5R Heavy Duty cam chain
Katech Oil Squirters to the piston bottoms for cooling
MSD Intake Manifold (no porting) Katech Paint matched
WP 102 Billet Throttle Body /Halltech HNW102 Silicone Conn hose
Halltech Carbon Super Bee™ CF112/w Halltech Carbon Super Beehive™
Beehive PSI springs and Katech Titanium Retainers
HP lifters (ceramic check from Cadillac Racing)
Katech lightweight pistons=13:1 static CR
ZR1 Carbon Ceramic Brakes/w StealthTitanium caliper mounting bolts & bleed screws
GM OE CARBON 19" front wheels/20" rears with Michelin Pilot Sport Cup 2s Front- 285 Rear-335
Carbon Fiber driveshaft
Coil Over Suspension/Race Anti-sway bars
Engine and Transmission Mounts
ATI underdrive crank balancer w/ ARP bolt pinned
Katech LS9X dual clutch/aluminum flywheel
Caravaggio Race Seats/D Steering Wheel
Aluminum honeycomb Tunnel Plate with titanium screws
Titanium lug nuts/hood hardware/Titanium seat mounting bolts, alternator bolts, headers bolts, steering rack bolts and nuts, belt tensioner bolts, rear deck bolts and nuts; titanium caliper mount bolts.
Kooks Headers mated to Akrapovic Titanium Xpipe and mufflers
Halltech ULZ Carbon exhaust tips designed for the AK EVO exhaust
EmailTune® tuned by Katech, tweaked by Halltech
65lb/hr FAST injectors
Stock radiator w/160 thermostat (177F water temps city)
Iridium Plugs with Katech Plug Wires
Katech C6.R coil relocation kit
Katech Aero kit, Carbon Fiber front rotor cooling ducting,
Halltech titanium plate and bolts Front Fascia Lift kit
Halltech Carbon Fiber Hive Port™ with full ram air modification
ZR1 Rear Spoiler Paint matched
APR Carbon Fiber Wing (Coming Off)
ZR1 Carbon Fiber Roof and B-pillar
Katech Carbon Fiber Deck Lid w/ Lexan rear window
Halltech GT2 Carbon Fiber Direct Radiator Exit Ducting (DRED) Hood
Halltech Carbon Fender Ducts, Rear Carbon Brake Ducts, Carbon Gurney Flaps, Halltech Carbon rear quarter panels (panels done but not installed) -10.5lbs
Mobil 1 Synthetic 5W30
Braille 340R Lithium Ion Battery Same battery used by the Corvette Race Team 9lbs.

[Aces]

Pretty impressive to do that with a 429. Friend of mine made 616 in his C6Z with a 454.
Pretty funny that the only thing not changed is the block which is why they can still call it an Ls7.

[93siro]

That is a beautiful curve for a LSx engine too.

[Sticky]

Pretty impressive to do that with a 429. Friend of mine made 616 in his C6Z with a 454.
Pretty funny that the only thing not changed is the block which is why they can still call it an Ls7.

Look at what this dumbass on Facebook wrote:

622 rwhp is not even close to the most powerful n/a c6 z06 or ls7. Pretty "run of the mill", especially with 13:1 compression and e85. It's been done on pump gas with a stock bottom end many times.

Yeah, 622 NA is run of the mill. GTFO.

[Aces]

HAHA. Now I gotta find that on FB

[Stucks]

seen a lot of vette guys running or switching (from FAST manifolds) to running the msd intake manifold. nice

[The Ghost]

It's funny how fast technology, parts, tuning improves. 600+ is common now. I did 626 on stock bottom end, and friends of mine have done 640-650 whp also with stock bottom-ends (with much more aggressive cams). Pump gas isn't much lower.

[subaru335i]

Its definitely a lot of power and would be crazy on the street.
If they were able to get the same hp per cylinder as NA hondas they would be over 1000whp and if the same specific output per liter it would be almost 1500whp from an NA 7L haha. Don't think that is possible with cam in block though.

[Sticky]

It's funny how fast technology, parts, tuning improves. 600+ is common now. I did 626 on stock bottom end,

Did you ever post a graph?

[Aaron]

Its definitely a lot of power and would be crazy on the street.
If they were able to get the same hp per cylinder as NA hondas they would be over 1000whp and if the same specific output per liter it would be almost 1500whp from an NA 7L haha. Don't think that is possible with cam in block though.

Cam in block isn't what's holding them back, it's other inherent design "flaws". The displacement means heavier interns, the V is a more inefficient design than an inline, but most of all, it's head flow. Even the LS7 heads, as amazing as they are, can't do what the 4v heads can.