shibby50

iTrader: (2)

To start off, I am building/helping build a ls6 from the ground up for a freinds' 04 GTO. We both have lots of experience around cars. I've personally built a few sbc's and bbc's, but not an lsx. I am looking for any imput/experiences with motor builds similar to this. The car currently is his Daily driver, but the plan is to build this motor on the stand out of the car and have it ready by spring. Then swap out the ls1 for the ls6.

The goal is to net around 600whp and hit 10's while being somewhat streetable. Obviously money is a factor, but this will be done over a decent amount of time so he is willing to drop a pretty penny in it. He wants to stay stock cubic inches so he wont be overpowering the 112 maggie because it's the smaller version.

Car's current mods:
04 GTO M6
Ls7 clutch
koni adjustable rear shocks
drag bags
Long-tube headers to cut-outs
M112 Magnacharger at 4psi
Stock bottom-end/heads/cam
Slick's skinny's set up for the track

We picked up a set of AFR 205 heads complete except for rockers and it came with a complete ls6 shortblock that this build will be based off of.

The Magnacharger will be put on the new motor before it is put into the car in the spring and tuned.

So far this is what we have planned/where we need help with the new build

Parts we have already:
-AFR 205 heads
-Ls6 block
-Ls6 crank

Parts we need help deciding on/brands
-Main/rod/cam bearings
-ARP studs?
-Cam
-Rockers
-What compression piston's
-Rods
-Gaskets
-Timing set-up
-Fuel system set-up
-Lifters

Any positive criticism/imput would be much appreciated as this is our first boosted lsx build. Also anything I've overlooked as I wrote this over a short period of time please feel free to add.

-Shib

conan

iTrader: (5)

Whats the size cc are the combustion chambers of the 205's ? For a street setup I would shoot for 9-9.5 :1 compression. Go with the ARP main studs and have the bearings alined honded. ARP head studs with a MLS head gasket. Lifters if you have the money get some morels if the budgets getting tight go with some ls7's. Timing set... A double roller would be my first choice, my rollmaster fits with the stock timing cover and no grinding. Or you could go with a single chain ls2. Rods... callies or lunati makes very nice rods. Pistons... dimond, wiseco, or mahle, depending on the dish size you need. Rockers if the stock rockers will work on the afr's I would stick with those, My stock rockers are about the only thing left in my new moter, and holding up just fine.

Cams, here's some blower cam choices. http://www.thunderracing.com/catalog/cart/?action=added

http://www.exoticperformanceplus.com....html?item=679

SiL3NtXWS6

iTrader: (17)

112 maggie @ 4 psi and still looking for 600? I think you would either need a CR on the higher end, or more boost.

I would shoot for a 9.5.1 CR

highly recommend using head studs on a booster motor
ls7 lifters are fine for your goals
stock rockers are fine for your goals
callies rods but you could get away with eagle.
wiesco pistons -11 or -7
C5R chain
GM MLS gaskets are fine.

Fuel system is up to you, too many variables.

shibby50

iTrader: (2)

That is the boost on the stock motor in the car, it will be upped to around 10-12 when put on the new motor

shibby50

iTrader: (2)

Was already leaning towards Eagle rods.
We plan on running 10-12psi. Should the CR still be upped to 9.5:1?
Going with a double-roller set-up. Any good brands?

SiL3NtXWS6

iTrader: (17)

I'm running 9.5.1 with more boost on pump gas. Should be fine.

shibby50

iTrader: (2)

Good to know. Thanks.

shibby50

iTrader: (2)

Bump*
Also need recommendations on:
Water pump
Oil pump
T-stat
Spark plugs
Has anybody heard anything bad about Clevite bearings? As that's what I think he is about to order for rod, cam, and main bearings.

SiL3NtXWS6

iTrader: (17)

Mellings performance oil pump (very highly recommended)
Stock water pump, with a 160' or 180' stat

NGK TR6 plugs will be fine for your application.
Nothing wrong with clevite bearings.

shibby50

iTrader: (2)

I see a lot of builds so far where people are using aftermarket lifters, but can't really find any reason why? Any big reason not to buy a set of OEM lifters for this build?

SiL3NtXWS6

iTrader: (17)

My car makes more hp than what you're looking for.. i'm running LS7 lifters. They are highly recommended, even by engine builders. GM did it right it with them.

shibby50

iTrader: (2)

Thanks man, you're a big help so far. I'm sure more questions are on the way.

TooLateVTEC

iTrader: (2)

If you want 10-12 psi of boost, I wouldnt want 9.5:1 compression with the bullshit gasoline we have today...unless the car will be solely on E85. I think somewhere near 9:1would be much better, in my opinion.