jbusmc1986

In all reality if it was for a FI build an LS3 motor would be a huge upgrade, the main reason why I wouldn't want to forge the LS7 is the fact that the cylinder walls are so thin, Yes I could send the block out to get sleeved, but thats just one more possible point of failure (8 more actually). The only real sensible options I could think of would be to swap to an LS3 block or an RHS, but the RHS is overkill and there is no need for me to spend more on the block then a whole new motor when its not needed.

Now adding turbos is something I will certainly be looking into, if for no other reason then to aid in traction by limiting the boost in 1-3 gear and then having full boost in 4th and 5th. However I really do like the ECS novi kits, they are by far less maintenance and the most proven system out there for any LS based vehicle.

Z_Rocks

I said downgrading from a LS7 to LS3, not from LS7 to Forged LS7.

Z_Rocks

I don't recall or perhaps I missed what your HP goals were. 700 HP with forged 427 is done & run successfully without the sleeves. Doug could forge the 427 for you and still get that low end TQ with a Centri S/C.

I say the best part is that, you have selected one of the best shops in the country and you can't find a better and more honest engineer than Doug.

ajrothm

I would go used Z06 for sure.... don't lose near the amount of money on depreciation that can be used for mods... I would do the blower/full exh, blower cam, meth and tune and see what it makes... set it say 750rwhp and let it ride and pocket the rest of the cash you would have spent on the GS.... IF it pops, then crack into your stash and build a killer LS7 or LSx for boost and shoot for 1000....

The best parts about the Z06 are:

*Better trans
*Better rear end
*Much more torque/hp down low (off boost), much for fun for in town driving..

Plus you still get the race inspired heritage that comes with a Z06...

$40k for used Z06, $25k for a built motor/FI setup.... $65k for 900-1000rwhp......

OR

$60k for a bone stock, brand new Grand Sport you are about to strip down...then dump another $10-15k in for the FI setup on a stock motor...and possible time bomb at 800+rwhp.

The choice is clear here IMOP...

turbotuner20v

If you're looking for a 'stronger trans' in the z06, make sure you get an '08+ with the TR6060

Unreal

No way $20-25k is going to make 900-1000rwhp unless you take labor out.

Blower setup $9000 (ysi, 8 rib, direct drive)
Forged Motor $6500
Cam etc $1000
Fuel system $2000
Clutch $1500
Headers $1500
I'm sure I'm leaving a ton off what is needed but that is just the basics. I think your looking $40-50k for 1000rwhp.

Unreal

He said sell the ls7 and put in a forged ls3 stroker motor. If the ls3 is setup for a 4.125" bore and he puts his ls7 heads on then who cares if it is an ls3/7 block. That is what I was getting at. He suggested a forged stroker ls3 and your said that would be a downgrade. Only if he goes smaller cube and ls3 style heads would it be a "downgrade".

Josh@AandASuperchargers

I voted used C6Z 'cause that's what I'd get. As others mentioned you get better parts in the car and lighter chassis.

jbusmc1986

Yessir... who cares if its an LS3 416 or an LS7 427... I am sure that the LS3 has exponentially more potential in FI setup

This seems to be the best way to go without question

While I will be doing some of the labor on my own, I agree, 1K hp would be at least in the neighborhood of 40K. Pretty much the only things I think I would not do is build/ swap the motor, tune, and clutch install.

I should also mention again that 1K rwhp is not my goal, and i will likely end up somewhere in the 7-800 range, which will probably already be a bear to try and put down, and this is a major concern of mine. I would rather have usable power and have it be fun, then having so much power that i can't ever put 1/2 of it down.

timmyZ06

how about a used Z06 with extended warranty runing mid-low 11's stock worry free
for 45 000-49 000? I know this isn't what op asked but still .

JustinStrife

That is what I would do. After having experienced stroker motors, I can't imagine running less than 400 cubes in my cars.

Mr.Big

^^^