| 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 |