jsmithshero

I used to have a C5 z06, and now I have a Viper GTS, so I've lost touch with the vette world.

I met someone who claims to have a 660rwp C6 Z06 with no power adders. I've only briefly heard the car, and while I do hear a lopey cam, it doesn't sound any wilder than that.

Is it really possible to make that much power without a power adder?

What kind of numbers would a C6Z with an aggressive heads/cam package, with full intake and exhaust, typically make?

Thanks

rio95

Most likely 590-600. Guy prolly means at the motor.

Geared

no, you can see 650-660 with the right combo.

https://www.corvetteforum.com/forums...widow-r-2.html

rio95

Not saying it isn't possible just saying that that dude is prolly full of crap.

jsmithshero

He's specifically telling people that it dyno'd at 660. I thought that sounded awfully high. He won't tell anyone what's done to the car. I'm not sure if it's because he doesn't know, wants to hide what's done, or not that much is actually done.

It seems like this is an oddity though, no?

My thoughts..

Geared

https://www.corvetteforum.com/forums...m-msd-c6z.html

jsmithshero

Interesting, so it's not too far off, and could be possible.

How much does a heads/cam/intake package like cost with parts and labor?

ConfusedGarage

Different dynos will read different numbers. Trap speeds will tell the real story, as a 660 rwhp C6z should be 140+, and you don't see that much unless you have a stud at MIR or Etown. In all my years of seeing NA LS7s across the country, they are typically 13x traps, which is not 660rwhp. Not saying some aren't, but am saying most aren't.

We have a 7% variance in dynos between the top 2 speed shops right here in Detroit. One is right on the money in my opinion (stock LS7 hitting 447), and the other is 7-8% higher every time for the same car. Just the nature of a dyno.

08mojo

Guesses here:

$2-$3k for the heads/porting
$500 for the cam
$1800 for the exhaust
$2k for the cai, intake, tb
$2k for the install/fluids/gaskets

So, $9-$10k?

GARY2004Z06

Here's one documented build from a forum member.
https://www.corvetteforum.com/forums...-102mm-tb.html

With that being said, 750 rwhp can be achieved with a more aggressive setup.

robz

My destroked Ls7(388ci) trapped 148mph not fully dialed in with an ITB manifold in a street car setup in decent air. This is obviously not the norm or an off the shelf build but at least real life data. And the motor has been completely refreshed and is for sale too if anyone is interested.

jsmithshero

Thanks, my initial thoughts were that it wasn't an easy task to hit those numbers.

It would nice to find a discounted Z with a blown motor and then do a build like this. Maybe I could save $5k..

Would it be correct to say that the people that are making 660 to the 750 you mentioned would really be the pioneers of pushing the limit and wouldn't represent most people with heads/cam/intake and other typical bolt ons?

Dumb question... why does a destroked smaller C.I. engine make so much more power?

robz

Answered above.

548chevelle

Chevy sells a 454 ci LS crate engine rated 770 hp with a single 4 barrel carb. Extrapolate those numbers and a 427 would be at 725 hp.

jsmithshero

Damn, what's one of those cost?

robz

Not sure but here's a proven ~700RWHP for under 15K.

Michael_D

With all due respect, this is a loaded question. I can probably get somewhere around 900-1000 crank power out of this engine, N/A and straight gasoline, but that will involve all non-OE components. And it'll run like crap on the street.

jsmithshero

You're right, let me ask that question in a better way..

If I wanted the best value for my dollar on a naturally aspirated build, there is probably a point where the cost for more power starts to increase dramatically. Where would a heads/cam/intake package (with supporting bolt ons) that is considered a good value, get me power wise?

robz

Prolly 560whp considering the budget most people are thinking.

548chevelle

LSX454R $18,845.40 part#19260835