By The Numbers
408ci Pontiac
Bore: 4.157 inches
Stroke: 3.750 inches
Displacement: 408 ci
Compression ratio: 10.4:1
Camshaft: Bullet hydraulic roller
Camshaft duration: 240/248 degrees at .050-inch tappet rise
Valve lift: .685/.685-inch
Rocker and ratio: COMP/Crower 1.7/1.65
Piston rings: JE .043/.043/3mm
Piston: JE forged
Block: OEM Pontiac production
Crankshaft: OEM Pontiac production
Rods: Scat H-beam, 6.625-inch
Cylinder head: Kauffman
Intake valve diameter: 2.250 inches
Exhaust valve diameter: 1.750 inches
Intake manifold Edelbrock Performer RPM
Carburetor: Holley 4150
Header: CHE 1¾-1⅞-inch stepped
Ignition: MSD
Damper: PRW

On The Dyno
408ci Pontiac
RPM: TQ: HP:
2,500 436 208
2,700 450 231
2,900 444 245
3,100 458 270
3,300 475 299
3,500 487 324
3,700 495 349
3,900 497 369
4,100 507 396
4,300 521 427
4,500 531 455
4,700 535 479
4,900 535 499
5,100 529 513
5,300 520 525
5,500 512 536
5,700 501 544
5,800 494 546
5,900 485 545
6,100 467 542
6,300 444 533
6,500 421 521

SOURCE
Ray's Dyno & Machine
155 Nulf Dr
Columbiana
OH  44408
330-501-3127