Bore: 4.310 inches
Stroke: 4.250 inches
Displacement: 496 ci
Block: factory GM four-bolt with ARP main studs
Compression ratio: 11.3
Engine fasteners: ARP
Crankshaft: Scat 4340
Camshaft: COMP Cams custom hydraulic roller
Timing chain: Cloyes Hex-A-Just
Lifters: Doug Herbert limited travel hydraulic roller
Pushrods: COMP Cams ⅜-inch diameter
Spring: Doug Herbert Alpha Series
Valvespring installed height: 2.050 inches
Spring load: 220 pounds seat/590 pounds over the nose
Retainers: Doug Herbert titanium
Keepers: COMP Cams 4130 10-degree
Intake duration: 246 degrees at .050
Intake valve lift: .647-inch gross
Exhaust duration: 248 degrees at .050
Exhaust valve lift: .634 inch gross
Rocker ratio: 1.85:1 intake, 1.75:1 exhaust
Lobe separation: 106 degrees
Installed centerline: 102 degrees
Top ring: Total Seal, gapless 1/16 inch
Second ring: Total Seal Classic (not gapless) 1/16
Second ring gap: .032 inch
Oil ring: Total Seal 3/16-inch low-tension
Rods: Scat 4340 I-beam, 6.385-inch long with ARP 2000 capscrews
Bearings: Clevite H-series
Main bearing clearance: .0030
Rod bearing clearance: .0026
Cylinder heads: RHS cast-iron 320cc, CNC ported by Weingartner Racing
Peak intake flow: 405 cfm
Peak exhaust flow: 305 cfm
Intake valves: REV stainless, 2.250 inches
Exhaust valves: REV stainless, 1.880 inches
Cylinder head gaskets: Fel-Pro 1037, .039-inch compressed thickness
Piston quench clearance: .039
Intake manifold: Brodix rectangular-port dual-plane
Carburetor: Holley 830 cfm
Headers: Doug’s Headers, 2.250-inch primaries
Distributor: PerTronix I3
Damper: Professional Products
Oil pump: Melling standard volume
Machine work: Dunsworth Machine Shop, Enid, OK
On The Dyno 496ci Big-Block Chevy 91-Octane Fuel
|
| RPM |
TQ |
HP |
| 2,500 |
529 |
252 |
| 2,600 |
542 |
268 |
| 2,700 |
549 |
282 |
| 2,800 |
556 |
296 |
| 2,900 |
566 |
313 |
| 3,000 |
579 |
331 |
| 3,100 |
588 |
347 |
| 3,200 |
590 |
360 |
| 3,300 |
586 |
368 |
| 3,400 |
577 |
374 |
| 3,500 |
568 |
379 |
| 3,600 |
562 |
386 |
| 3,700 |
568 |
400 |
| 3,800 |
581 |
420 |
| 3,900 |
593 |
441 |
| 4,000 |
599 |
456 |
| 4,100 |
602 |
470 |
| 4,200 |
606 |
484 |
| 4,300 |
610 |
499 |
| 4,400 |
614 |
514 |
| 4,500 |
618 |
530 |
| 4,600 |
621 |
544 |
| 4,700 |
622 |
557 |
| 4,800 |
621 |
568 |
| 4,900 |
622 |
580 |
| 5,000 |
621 |
591 |
| 5,100 |
619 |
601 |
| 5,200 |
618 |
612 |
| 5,300 |
615 |
621 |
| 5,400 |
612 |
629 |
| 5,500 |
607 |
636 |
| 5,600 |
600 |
640 |
| 5,700 |
594 |
645 |
| 5,800 |
587 |
648 |
| 5,900 |
579 |
650 |
| 6,000 |
572 |
654 |
| 6,100 |
567 |
659 |
| 6,200 |
559 |
660 |
| 6,300 |
545 |
654 |
| 6,400 |
529 |
644 |
| 6,500 |
516 |
638 |