Designing a 650-750 HP LS motor

[youthpastor]

I have a client who want to build and LS and 6 speed for his '69 Camaro. Here's the requirements. Make 700ish Hp and be able to drive it to work without getting beat up. I'm thinking supercharger on a LSX block configuration. What do you guys think?

Let's get specific- cam specs- Crank and rod manufacture. Displacement etc.

Short of calling Mast, what are some good ideas?

Thanks- Chris

[realcoray]

I would not do lsx block because I have read they have various issues and require a lot of machining to use.

At 700 hp I'd debate if you need a block with provisions for 6 bolt cylinder heads. I'd say forged 402-427 short block, TFS or AFR heads, a cam spec'd out by someone who has experience (like PatG on ls1tech), and a supercharger and you're there.

You can also go bigger on displacement and cam, add fast 102 intake and probably get there NA but drivability may suffer.

Realistically you can just throw a turbo or supercharger on any ls engine, even a stock 4.8l and probably make 700hp but for reliability and drivability sake I'd probably not do that.

[Moose]

I'm also in agreement that a LSX block is neccessary. I have a friend who is running a 348 with 850 rwhp with a ECS supercharger setup.

I really like the new kenne bell supercharger. http://kennebell.net/KBWebsite/SC_pg...s/SCCAM6.2.htm

They are getting 720rwhp out of a stock motor. Put some good pistons and rods in it, you will be fine.

Cam, there are so many out there, I've got no clue which is best.

[hifi875]

get a crate ls9. with exhaust and a tune 700 is no problem and you can drive it everyday

[canrc]

Have a look at Wegner Automotive, they have a few N/A LS motors on their site making those numbers -- and they are great guys and always more than happy to help.

Their youtube page....

https://www.youtube.com/user/WegnerMotorsports

[70rs]

Originally Posted by hifi875

get a crate ls9. with exhaust and a tune 700 is no problem and you can drive it everyday

I'd have to agree. Plus you get the benefit of GMs engineering and don't have to mix and match parts. At those power levels having everything designed as a package from a OEM goes a long way in my book. Daily driver comfort and reliability and all the kick you could ever hope to want all in one crate from GM. Expensive up front, but well worth it overall I think.

[67ragtp]

Chris,

No doubt boost will get you there, but how about a 460-500 inch N/A LS, block prepped by RHS or RED. Callies/Weisco internals, Big LS7 black label heads or WCCH. FAST intake/102mm throttlebody. Cammed approprietly should do 650 rear wheel no problem and drive nice.

Look at Rupp's build, he drives his with out issues, dont know if he ever changed his throttlebody but it should be in the 650+ range.

Rich

[SLO_Z28]

Originally Posted by hifi875

get a crate ls9. with exhaust and a tune 700 is no problem and you can drive it everyday

^ I agree. For drivability and reliability its hard to beat a setup like that.

[Jr]

Does your customer want 700 to the wheels or flywheel? Is your customer accustom to high HP cars? I'm willing to bet that a LS2 or LS3 with a maggie or whipple would be more than enough for your customer.

[J2SpeedandCustom]

You know for a 12 month warranty a GM performance LSx blocked motor is a pretty damn good deal... Have a few customers with supercharged motors like this. A 376 lsx made for boost can easily make the power you want and not brake the bank.