[Mhdsu]

I am building a 6.0 ls for my 68 Camaro. I am wanting about 500hp to the rear wheels. Can I use the stock pistons and rods?


Thanks,

 

[DOUG G]

Yes, BUT...... how you plan to get there ?

turbo

nitrous

NA

????

 

[Mhdsu]

NA. Aftermarket Cam, Heads. Where will that get me? Thanks,

 

[Vega$69]

I would run CNC LS3 heads along with the stock LS3 intake. Add a BT3 cam and you will be reliable 580ish crank. Close to your goal and still very drivable.

All hinges on a good tune though

 

[DOUG G]

Give or take....depending on parts picked.....between 400-600 FWHP.

Mine shows :
Your HP computed from your vehicle ET is 462.09 rear wheel HP and 513.43 flywheel HP.
Your HP computed from your vehicle MPH is 442.55 rear wheel HP and 491.72 flywheel HP

 

[3d cad]

I am looking into going the same route. What 6.0 have you got? Pistons vary. Heads vary. What static CR are you aiming for? That will determine the pistons. The guy who would be doing my machining says that if you already have the 6.0 torn down toss the rods and all the fasteners. I think Johns dead on with the heads but if you dont mind ugly the truck manifold might do.

 

[Mhdsu]

2002 LQ4, 10 or 11:1

 

[slazisme]

The GM rods are good for about 600HP but put some ARP bolts in.
If you're running the LQ4 317 heads they are lower compression, turbo & charged guys like them for the bigger chambers. These pistons will help with the rise the compression.
https://horsepowerdirect.com/produc...t-piston-and-ring-kits?variant=12610446131303
The above pic shows a dished piston & isn't what they look like, search for another pic....they have a raised .090 dome.

 

[Mhdsu]

Looking at using the CNC LS3 heads from Summit Racing and they are 68cc. How will that affect CR? The pistons you mentioned are 11:1 with a 65cc head.

 

[slazisme]

Some variables have to be considered, head gasket thickness, whether its standard bore or .030 over, but my guesstimate is 11.5.
You might want to head over to LS1tech for info on LS engines.
https://ls1tech.com/forums/generation-iii-internal-engine-5/

 

[Mhdsu]

It will be standard bore

 

[DOUG G]

Just to compare....

Mine,

2005 LQ4 stock short block.
LS3 heads....shaved .050 to get comp. up to approx. 10.8:1 (you can do the same w/ the 317's ) Basically a LY6.
Stock pistons fly-cut for valve clearance
23X/24X @ 110 LSA (very close to the one you posted) w/ .624 lift

The guy's motor who I copied has ran a best of 9.9X with the norm being 10.0-10.2 @ 29XX race weight. I'm still fighting a few issues

Stock...

LQ4 is 9.4:1....72cc heads

LQ9 9.8:1 (I think).....69cc heads

LY6 9.6:1.... 70cc heads

Shaving my LS3 heads made them 62cc I believe it was.

Be sure to measure PTV regardless of what heads with that cam

 

[Vega$69]

Stock LQ9 is 11.1 CR. 317 heads are 71cc. LS3 heads are 68.5cc. Will not make make much diff in CR

The stock LS3 heads flow extremely well on the 6.2 and will be just fine on the lower cube 6.0. The truck intake is a good choice but ugly and may not fit under the 1st Gen hood. The stock LS3 intake is very good with its long runners yields very good low end and mid range torque. In fact MSD stopped producing it Atomic Intake for LS3 because it did not perform as well as the stock intake.

The BT3 cam is good on manual trannys. If used with auto make sure you have a TC that will work with the cam profile.

 

[DOUG G]

OK, John....I'll split it with you....lol


LQ9 6.0L TECH SPECS:

Part Number: 19156262
Engine type: LS Series V-8
Displacement (cu in): 364 (6.0L)
Bore x stroke (mm): 101.6 x 92
Block (P/N 12572808): Cast iron with 6-bolt, cross-bolted main caps
Crankshaft (P/N 12569768): Nodular iron
Connecting rods (P/N 12567583): Powdered metal steel
Pistons (P/N 89017478): Cast aluminum
Camshaft type (P/N 12561721): Hydraulic roller
Camshaft lift (in): .467 intake / .479 exhaust
Camshaft duration (@.050 in): 196'c1 intake / 201'c1 exhaust
Cylinder heads (P/N 12562319): Aluminum, symmetrical port
Valve size (in): 2.00 intake / 1.55 exhaust
Compression ratio: 10:1
Rocker Arms (P/N 10214664): Investment cast, roller trunnion
Rocker arm ratio: 1.7:1
Recommended fuel: 92 octane
Maximum rpm: 5600
Reluctor wheel: 24X

 

[Vega$69]

Doug is correct. LQ9 stock 10.1:1 Swapping to 243 heads and it’s 11:1

LS2 is 10.9:1

 

[DOUG G]

If E85 was readily available, I'd go 12:1 in a heartbeat. LOL

 

[Mhdsu]

thanks for the help, guys! what do you guys think about a holley terminator 4bbl efi for the fuel system?

 

[Vega$69]

thanks for the help, guys! what do you guys think about a holley terminator 4bbl efi for the fuel system?

Short runners kill low end torque. Great for WOT strip cars.

Plus it’s $2000. You can buy a fully loaded OEM intake with injectors, fuel rails map sensor and TB $500 or less.

 

[DOUG G]

Short runners kill low end torque. Great for WOT strip cars.

Plus it’s $2000. You can buy a fully loaded OEM intake with injectors, fuel rails map sensor and TB $500 or less.

And can still run an aftermarket controller IF you wanted/needed to or even a pinned out factory box with the VATS removed.

 

[Mhdsu]

Hey guys, sorry for all the dumb questions but I am kind of new to all of this. If I use the LQ4 bottom end with the LS3 top end, which PCM do I need to use? Also, which reluctor wheel on the crank 24 or 58?