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

Top ring gap: .028 inch

Second ring: Total Seal Classic (not gapless) 1/16

Second ring gap: .032 inch

Oil ring: Total Seal 3/16-inch low-tension

Pistons: Probe forged

Main bolts: ARP studs

Rods: Scat 4340 I-beam, 6.385-inch long with ARP 2000 capscrews

Main journal: Chevy OE

Bearings: Clevite H-series

Main bearing clearance: .0030

Rod journals: Chevy OE

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

Ignition: PerTronix I3

Distributor: PerTronix I3

Spark plug wires: MSD

Damper: Professional Products

Water pump: CVR

Oil pan: Hamburger

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

SOURCE
Doug's Headers
440 East Arrow Highway
San Dimas  91773
909-599-5955
www.pertronix.com
Pertronix
440 East Arrow Highway
San Dimas
CA  91773
909-599-5955
www.pertronix.com
ARP
1863 Eastman Avenue
Ventura
CA  93003
800-826-3045
www.arp-bolts.com
Clevite/Mahle
7670 Hacks Cross Road
Olive Branch
MS  38654
662-893-2860
www.engineparts.com
Brodix
301 Maple P.O. Box 1347
Mena
AR  71953
479-394-1075
http://www.brodix.com
Probe Industries
2555 West 237th Street
Torrance
CA  90505
310-784-2977
http://www.probeindustries.com
Comp Cams
3406 Democrat Road
Memphis
TN  38118
800-999-0853
http://www.compcams.com
Hamburger Performance Products
12438 Putnam Street
Whittier
CA  90602
562-921-0404
www.hamburgersperformance.com
Cloyes Gear And Products Inc.
Ft. Smith
AR
479-645-1662
http://www.cloyes.com
Doug Herbert Performance
877-497-2787
http://www.dougherbert.com
Scat Enterprises Inc.
Redondo Beach
CA
310-370-5501
www.scatcrankshafts.com
MSD
915-857-3344
www.MSDIgnition.com
RHS
3416 Democrat Road
Memphis
TN  38118
877-776-4323
http://www.racingheadservice.com
Melling Automotive Products
2620 Saradan Dr
Jackson
MI  49202
517-787-8172
www.melling.com
Racing Engine Valves, Inc. (REV)
2610 Windsor Ave
West Palm Beach
FL  33407
800-398-6348
www.revvalves.com
Dunsworth Machine
580-233-5812
www.Dunsworth-Machine.com
Fel-Pro
26555 Northwestern Highway
Southfield
MI  48033
248-354-7700
www.federal-mogul.com
High Velocity Heads
865-573-9151
www.HighVelocityHeads.com
Total Seal Inc
22642 North 15th Avenue
Phoenix
AZ  85027
800-874-2753
www.totalseal.com
Weingartner Racing Engines
918-520-3480
www.WEngines.com
Holley
1801 Russellville Road
Bowling Green
KY  42101
270-781-9741
www.holley.com