Hello guys,

I am new to the LS1 Tech site. I currently have a 2005 C6. I have looked around and searched for the past few weeks trying to determine the best route for my car. I am going to go with a magna charger but would also like to build the motor up as well and run about 7psi.

Im not sure in which order Im going to do this....FI first or NA build first.

Anyhow,

What all is involved in changing over the current LS2 I have in my car to a 402/403 or replacing it with the L92 block? What would I be looking at for a turn key package? What would the parts (on average) run me?

I would like to keep a decent CR for possibility of 8-10psi when the maggie MP122 upgrade releases, but I dont want to sacrfice too much NA power from the block.

I have used the SEARCH tool, but my questions are a little more specific in nature.

I have also been in email contact with BG at SDPC.


Thanks gentlemen,

 

The maggie wont be able to support either motor really. I would expect the most psi you'll see is around 4-5 lbs on either setup making around 600 rwhp. Just avoid the maggie and spray a little 75 or 100 shot and make way more power and save 4500 bucks in the process.

Nate

 

Well the maggie is making around 8-10psi on their new setup. Kenny Duttweiler is running it with a 402 and makes pretty good numbers. I dont track the car so it would be for more of a "street fun" application.

"Duttweiler Performance is now offering this 402 CI, LS2/Maggie configuration as a 740 HP crate motor. Making 650 foot pounds of torque at a mere 2500 RPM "


What would I put down na on a motor like that with a street friendly cam?

 

Probably looking at 525-575 na if they spin it.

 

Go with the Kenne Bell over the maggie. It will have no problem feeding a 402. IMHO if you are going to go blown dont worry about swapping the block for the extra cubes, just go forged 402 and turn the boost up a little.

 

I havent seen anything too positive on the KB for the C6 application. Maggie is doing well especially with their upgrade to the current. It will give you 10psi which is plenty for a forged 402 I would think.


I think I may just go with a maggie and play with it this summer and well, once winter comes ill start collecting parts for a forged 402. 600rwhp/550rwtq is about the maxx im looking for, then its on to the rear end.

 

you have to remember that 10psi doesnt tell you anything. you need to be looking at the airflow the supercharger can provide to tell you the real story. you can build the engine and put the supercharger on there and make 10-15psi but that doesnt mean you will make even 500rwhp or you can build the engine right and make 4-5psi and make 550rwhp.

if it were me spending that much money, i would go with the kenne bell because it leaves you room to up the boost later on when the bug hits again. ive personally never seen the magnacharger make more than 530-550rwhp on ANY engine combination so thats something to think about as well.

 

well whats this all about then?

http://www.magnacharger.com/pr020.htm


Thanks guys...

I think I may just go with the maggie or STS (still on the fence) then do a nice built 402 this winter....we shall see though!!!!

 

id go for KB or STS. but i like turbos!

both should beable to diliver all the power you want

Chris.

 

with an hp racing twin turbo kit for corvettes{ frontmount off cylinder heads} and a 402ci you should pull that on pump gas .740rwhp ,not flywheel
also just buy a 4.00 stroker crank /rods/ pistons/rings /bearings for your current engine its all ready has a 4.00'' bore add a 4.00'' stroker crank theres a 402 with the parts you want not some halfassed ****

 

What something like this cost?

 

TT Kit rounded high $10,000 complete
CRANK, RODS, PISTONS, RINGS ,BEARINGS {parts only} around $5,000 thats something like Lunati Pro Mod Stuff so $1,800 crank/ $1,100 rods / $1,100 JE Pistons & Rings
Fuel system $1,500
Figure another $10,000 for supporting Items for the car

Being able wax any car made PriceLess

 

heck yes!

 

 

There are many ways you can go to build up your LS2 to produce 600 rwhp

One thought would be a Lunati Stroker Kit (typically they are listed for the 3.903" LS1 but switch the pistons for a set of 4.005" LS2 pistons).
That will set you back around 4K with an ARP rebuild kit (all the bolts).
That gives you a forged 402 with some of the best parts in the business.

Top it with a ported set of L92 heads and either a Mizfitz hand fab'd manifold or wait for the Ausie L76 manifold.
Get a good cam to make the 402 streetable and powerfull.
HP Tuner's and a Wideband reader to keep the car emission's legal.

Support it with the appropriate Vette exhaust line ie:
LG, SW, or TPiS 1 3/4" Long Tubes; High Flow Cats; and a Good dual exhaust setup.

Don't forget a clutch (or torque converter if your ride is an automatic) and some goodies to keep the rear end from grenading from the new driveline.

Oh and that is just for a Naturally aspirated 550rwhp vehicle... if you still need more then pick up a ATI pro charger kit with an air to air intercooler as it will blow a maggie away in most instances. or the STS turbo setups....

You're looking at spending a decent amount of money if you do it yourself or if you have someone do it for you...

There are many different ways to get to the goal.
The Path is the fun part cause you get to choose how you are going to get to the goal.... just pick one that is enjoyable for you.

 

Thanks Bring the Noise!

If I were to go with the lunati package can you recommend a vendor to work with on getting the parts?

How many hours of labor is involved?

I already have LT headers, hf cats, dual exhaust

When is hte l76 manifold going to be ready (or should I even ask ?) lol Would I see similar results from a set of AFR225's?

With a meduim cam would this still be able to be driven daily?

 

For those that dont know and keep saying go kenne bell, maggie just released a new blower that is larger than the last and WILL feed an ls2 just fine and even a 402-408.

 

see post number 8 up a few posts.


I have been watching the KB on the C5 and have yet to see anything too impressive. Also it took almost 3 years to develop a system for hte C5, who knows when the C6 would be avail.

 

I just ordered my exhaust through ls1speed.com and they have been very helpful in figuring out the parts that I wanted and giving me a good price.

They (ls1speed) carry the LS1 stroker kits from Lunati for around $3700 and you would need to talk to them to swap the 3.8" pistons for the 4.0" one that are needed for an LS2.
Something along the lines of of the EA034-038 kit (408 kit with 4.030 pistons), but with 4.005 pistons instead for a 402.

Tbyrne.com also has discounted prices on Lunati rotating assemblies list in this weeks specials (I've talked to them a couple of times and came very very close to buying a set of coated headers a month or two back).

SDPC also carries Lunati kits (or can order them). I have dealt with them and have no problem recommending them.


All of the above are vendors for LS1tech (Links are on the right)


Pricing for an engine rebuild will vary on location (where you take it).
I would suggest having the block checked while it's apart (blue printed and line honed) just for piece of mind since you plan on pushing 600hp+.

For the Engine Build, spend a little more and have it done correctly by a shop with experience in LS1 or LS2 buildups.

IE: Check around in your area for engine builders who have experience building LS1/LS2 motors or who have built older SBC motors (L98's LT1's etc).
Get a price for the build up front in writing so there will be no little things later on.

And don't forget the little things like an ARP rebuilt kit, heavier duty cam gear set, etc.

The AFR225's are damn good heads but a built set of L92 would cost your about half the price. Figure AFR225's will start at around $2399 and that's complete but a fully ported set will run you closer to $3000 (on average from looking at the different vendors that offer Ported AFR's). Add on 400 to 600 more for high end rockers or 145 for 16 Ls7 exhaust rocker arms (can't use Ls7 intake rockers on the AFR's as the intake rockers are offset).

The L92's port'd and loaded with high end aftermarket goodies (dual springs, ls7 rockers, and fererra valves) should come to around $1500 (including gaskets and ARP studs).
SPDC list's the LS7 1.8" rockers for $8.95 each intake and exhaust ($145 for 8 intake and 8 exhaust rocker arms).
They list the assembled L92 heads for $399 each (not sure which springs they come with though).
Adding in porting, larger springs, ARP Studs, and a Gasket set should put it at $2000 or cheaper to be honest.

In all honesty I'm waiting for Gunnar to list up a Patriot L92 package.
Patriot Gold springs should make for a good add on which would allow the ls7 rockers to push most standard Ls1/Ls2 cam designs into the 6.25" lift area. (most LS1 cam's are designed for a 1.7" rocker arm

The L92 manifolds are similar to the LS2 manifold so you should be able to carry over your fuel rails and throttle body (you will definitely need larger injectors though for your power goals).

The main wait on switching over to the L92 heads for most of the people with 4.00 or larger bores is the fact that the inexpensive manifold hasn't shown up yet.

Sometimes it sucks being in the 1 to 2 months timeframe before something becomes available (L76 low profile manifold).

 

Doh I forgot about the SDPC 402 shortblocks.
http://www.sdpc2000.com/catalog/4274...Assemblies.htm

If I remember correctly they use a Callies Crank and Rods with Diamond Pistons.
You could go with the -14cc dish'd piston set top it off with L92 heads
(might put the motor around 9.75:1 compression, and that is just a off the top of my head guestimation)
so you could boost the crap out of that (say 12 psi or so).

Pick up a new oil pump and tray then sell your old Ls2 as a complete motor on ebay or something... god I need to cut back on the mountain dews!!!