By the Numbers 409ci LQ4 Iron-Block LS
Block: 6.0 LS truck
Bore: 4.03 inches
Stroke: 4.00 inches
Displacement: 409 cid
Compression ratio: 11.4:1
Crankshaft: Scat
Camshaft: Demos Cams
Timing chain: Liberty
Lifters: GM CTS-V
Pushrods: COMP Cams 7944 7.25 inches long (5/16-inch diameter)
Springs: Lunati Gold Series (73925K2LUN)
Installed height: 1.810 inches
Spring load, closed: 153 pounds
Spring load, open: 400 pounds
Retainer: Lunati
Valve locks: Lunati
Duration, intake: 276 degrees
Intake lift: .607 inch
Duration, exhaust: 282 degrees
Exhaust lift: .607 inch
Rockers: Harland Sharp, adjustable
Rocker ratio: 1.8/1.8
Lobe separation: 108 degrees
Installed centerline: 102 degrees
Ring pack: Total Seal
Ring endgap: gapless
Piston: Mahle
Piston clearance: 0.005 inch
Main studs: ARP
Rods: Scat 6.125-inch I-beam
Main bearings: King
Rod bearings: King
Main journal diameter: OEM
Rod journal diameter: 2.100 inches
Main clearance: .003 inch
Rod clearance: .0024 inch
Cylinder heads: GM L92
Head bolts: ARP bolts
Intake manifold: GM dual-plane
Intake port flow: 335 cfm at .600-inch lift
Exhaust port flow: 255 cfm at .600-inch lift
Intake valve: Ferrea 2.165 inch
Exhaust valve: Liberty 1.60 inch
Cylinder head gaskets: stock GM
Piston/head clearance: 0.051 inch
Engine gaskets: OEM
Carburetor: D&A-built Holley 750
Headers: Hedman Husler
Coils: GM, stock
Ignition: MSD 6010
Spark plug wires: MSD
Damper: PRW
Water pump: stock GM with Moroso drive
Oil pan: stock 6.0L truck
Oil pump: GM L92
Oil: AMSOIL 10w30

On the Dyno 409ci LQ4 Chevy

RPM TQ HP
2,500 533 257
2,600 534 264
2,700 549 282
2,800 562 300
2,900 570 315
3,000 575 329
3,100 579 342
3,200 581 354
3,300 580 364
3,400 577 374
3,500 578 385
3,600 579 397
3,700 577 406
3,800 572 414
3,900 569 422
4,000 568 432
4,100 566 442
4,200 564 451
4,300 565 463
4,400 567 475
4,500 565 484
4,600 565 494
4,700 566 507
4,800 570 521
4,900 569 531
5,000 565 538
5,100 564 547
5,200 563 558
5,300 559 564
5,400 553 568
5,500 549 575
5,600 545 582
5,700 540 586
5,800 532 588
5,900 520 584
6,000 507 579
6,100 491 571
6,200 479 565
6,300 470 564
6,400 463 564

SOURCE
Moroso
80 Carter Drive
Guilford
CT  06437
203-453-6571
www.moroso.com
AMSOIL
925 Tower Ave.
Superior
WI  54880
800-777-8491
http://www.amsoil.com
King Engine Bearings
327 Little Falls road, Suite 5
Cedar Grove
NJ  07009
800-772-3670
http://www.kingbearings.com
D&A Machine Shop
770-479-5878
www.D-APerformanceEngines.com
MAHLE Clevite
7670 Hacks Cross Road
Olive Branch
MS  38654
662-893-2860
www.mahleclevite.com
Hedman
NA
AK
562-921-0404
www.hedman.com
MSD
915-857-3344
www.MSDIgnition.com
Ferrea Racing Components
2600 N.W. 55 Court
Suite 234
Fort Lauderdale
FL  33309
888-733-2505
www.ferrea.com
ARP
1863 Eastman Avenue
Ventura
CA  93003
800-826-3045
www.arp-bolts.com
Harland Sharp
19769 Progress Dr.
Strongsville
OH  44149
440-238-3260
http://www.harlandsharp.com
GMPP
www.gmperformanceparts.com
Holley Performance Products
1801 Russellville Rd.
Bowling Green
KY  42101
270-782-2900
http://www.holley.com
Demos Cams
706-367-2417
www.DemosCams.com
Comp Cams
3406 Democrat Road
Memphis
TN  38118
800-999-0853
http://www.compcams.com
Total Seal Inc
22642 North 15th Avenue
Phoenix
AZ  85027
800-874-2753
www.totalseal.com
Scat Enterprises Inc.
Redondo Beach
CA
310-370-5501
www.scatcrankshafts.com
PRW
Placentia
CA  92870
866-412-9630
http://www.prwonlinestore.com