The following I have taken from my old site and is a collection of camshaft information , mainly comparing Comp cams to one another. 

While the images are not appearing, if you click on them it will take you to the original image.

You will discover the shorter the @ .050" duration the more low RPM power will be made.

 

Competition Cams Dyno Charts

CLICK ON CHARTS TO ENLARGE AND REVIEW DETAILS

Tested with Chevrolet 350 Small Block
Bore+4.040" Stroke=3.480" 9.25:1Compression ratio
Dart S/R Heads       Edelbrock Performer Manifold
Holley #3310 Vac. Sec. Carb 1 5/8" Headers

HYDRAULIC FLAT TAPPET HYDRAULIC ROLLER TAPPET

 With a short duration camshaft, a flat tappet style will make more power. This is because the advertised duration is longer on a roller cam, (same @ .050" lift spec) so that it can absorb the store energy(inertia) in the heavier hydraulic roller lifter, before it begins lifting it aggressively. This extra duration reduces cylinder pressure and therefore reduces power.

Once the duration becomes longer the benefits of a fast lifting hydraulic roller out way the lower cylinder pressure by making it back up with increased flow.

The factory engines use hydraulic roller camshaft for warranty reasons, greater reliabilty, not for making more power. A roller needs work to do, long duration, high lift, a small cam just doesn't benefit from a roller.

I have custom cams ground by Bullet. They offer a much wider selection of profiles, more specificlly engineering for each application. The cost about $50 more than a Comp Cams off the shelf cam.

XE250H
600-4600RPM
DUR 206 / 212
LIFT 432/444

XR258HR
1000-5000RPM
DUR 206 / 212
LIFT 480/487

Max Torque 417 ftlbs @ 3700 RPM
Max Horsepower 333 HP @ 4700 RPM
Vacuum 19.5" Hg @ 800 RPM
21" Hg @ 1000 RPM

Max Torque 413 ftlbs @ 3700 RPM
Max Horsepower 325 HP @ 4400 RPM
Vacuum 17" Hg @ 800 RPM

18" Hg @ 1000 RPM

 

XE256H
1000-5200RPM
DUR 212 / 218

LIFT 462/469

XR264HR
1200-5200RPM
DUR 212 / 218
LIFT 487/495

Max Torque 411 ftlbs @ 3600 RPM
Max Horsepower 330 HP @ 4700 RPM
Vacuum 18.5" Hg @ 800 RPM

20" Hg @ 1000 RPM

Max Torque 421ftlbs @ 4000 RPM
Max Horsepower 335 HP @ 4900 RPM
Vacuum 15.5" Hg @ 800 RPM

17" Hg @ 1000 RPM

 

XE262H
1300-5600RPM
DUR 218 / 224

LIFT 462/469

XR270HR
1600-5400RPM
DUR 218 / 224
LIFT 495/502

Max Torque 415 ftlbs @ 3700 RPM
Max Horsepower 348 HP @ 5300 RPM
Vacuum 17.5" Hg @ 800 RPM
18.5" Hg @ 1000 RPM

Max Torque 415 ftlbs @ 3800 RPM
Max Horsepower 342 HP @ 5100 RPM
Vacuum 15" Hg @ 800 RPM

16.5" Hg @ 1000 RPM

 

XE268H (S/R Heads)
1600-5800RPM
DUR 224 / 230

LIFT 477/480

XR276HR(Sportman Heads)

 1900-5600RPM
DUR 224 / 230
LIFT 502/510

Max Torque 413 ftlbs @ 3800 RPM
Max Horsepower 342 HP @ 5000 RPM
Vacuum 15.5" Hg @ 800 RPM

17" Hg @ 1000 RPM

Max Torque 427 ftlbs @ 3700 RPM
Max Horsepower 373 HP @ 5200 RPM
Vacuum 12" Hg @ 800 RPM

14" Hg @ 1000 RPM

12Hg vacuum is enough for most power brakes, dropping to 10Hg is probably not enough. Electric Vacuum Pumps offer a solution.

SUM-760152.jpg

XE274H
1800-6000RPM
DUR 230 / 236

LIFT 487/490

XR282HR
2200-5800RPM
DUR 230 / 236
LIFT 510/520

Max Torque 410 ftlbs @ 3900 RPM
Max Horsepower 369 HP @ 5900 RPM
Vacuum 11" Hg @ 800 RPM

14" Hg @ 1000 RPM

Max Torque 385 ftlbs @ 3900 RPM
Max Horsepower 402 HP @ 6100 RPM
Vacuum 9" Hg @ 800 RPM

11.5" Hg @ 1000 RPM

________________________________________________________________

Tested with Chevrolet 350 Small Block
Bore=4.040" Stroke=3.480" 9.25:1Compression ratio
Sportsman II Heads   Edelbrock Victor Jr Manifold
Holley 750 dbl. pmper Carb 1 3/4" Headers

 

XR288HR
2500-6000RPM
DUR 236 / 242
LIFT 520/540

XE284H
2300-6500RPM
DUR 240 / 246

LIFT 507/510

 

 

Max Torque 385 ftlbs @ 3700 RPM
Max Horsepower 406 HP @ 6100 RPM
Vacuum 9.5" Hg @ 800 RPM

12" Hg @ 1000 RPM

Max Torque 377 ftlbs @ 3900 RPM
Max Horsepower 390 HP @ 5800 RPM
Vacuum 8" Hg @ 800 RPM

10.5" Hg @ 1000 RPM

 

XR294HR
2800-6100RPM
DUR 242 / 248
LIFT 540/562

XR300HR
3200-6200RPM
DUR 248 / 254
LIFT 562/580

 

 

 

Max Torque 380 ftlbs @ 4100 RPM
Max Horsepower 420 HP @ 6100 RPM
Vacuum 8" Hg @ 800 RPM

10.5" Hg @ 1000 RPM

Max Torque 380 ftlbs @ 4000 RPM
Max Horsepower 426 HP @ 6200 RPM
Vacuum 6.5" Hg @ 800 RPM

9" Hg @ 1000 RPM

 

 

XE294H
2800-7000RPM
DUR 250 / 256

LIFT 519/523

 

 

Max Torque 394 ftlbs @ 4100 RPM
Max Horsepower 415 HP @ 5800 RPM
Vacuum 9.5" Hg @ 800
RPM

11.5" Hg @ 1000 RPM

FAQ about Competetion Cams brand Camshafts.

SINGLE PLANE
107º LSA 110º LSA 113º LSA
Avg. torque   495 lb-ft Avg. torque   491 lb-ft Avg. torque   481 lb-ft
Avg. power   456 hp Avg. power   452 hp Avg. power   445 hp
RPM LB-FT HP RPM LB-FT HP RPM LB-FT HP
2,500 419 199 2,500 417 198 2,500 386 184
2,600 420 208 2,600 417 206 2,600 392 194
2,700 424 218 2,700 421 216 2,700 399 205
2,800 431 230 2,800 426 227 2,800 404 215
2,900 439 243 2,900 430 238 2,900 407 224
3,000 449 256 3,000 439 250 3,000 417 238
3,100 456 269 3,100 451 266 3,100 428 253
3,200 461 281 3,200 459 280 3,200 438 267
3,300 465 292 3,300 464 292 3,300 452 284
3,400 468 303 3,400 467 302 3,400 456 295
3,500 471 314 3,500 468 312 3,500 460 307
3,600 478 327 3,600 474 325 3,600 465 319
3,700 485 342 3,700 483 340 3,700 471 332
3,800 491 355 3,800 487 352 3,800 473 342
3,900 495 367 3,900 488 362 3,900 473 351
4,000 498 380 4,000 492 375 4,000 479 365
4,100 506 395 4,100 499 389 4,100 484 378
4,200 514 411 4,200 507 405 4,200 491 393
4,300 520 426 4,300 516 423 4,300 499 409
4,400 526 441 4,400 521 437 4,400 505 423
4,500 528 452 4,500 524 449 4,500 512 438
4,600 533 467 4,600 527 462 4,600 519 455
4,700 535 479 4,700 531 475 4,700 523 468
4,800 539 492 4,800 534 488 4,800 526 481
4,900 541 505 4,900 536 500 4,900 529 494
5,000 543 517 5,000 538 512 5,000 529 504
5,100 543 528 5,100 540 524 5,100 531 515
5,200 543 537 5,200 539 534 5,200 530 524
5,300 541 546 5,300 538 542 5,300 530 535
5,400 539 554 5,400 537 552 5,400 530 545
5,500 537 562 5,500 535 560 5,500 528 553
5,600 534 569 5,600 532 567 5,600 525 560
5,700 531 576 5,700 528 573 5,700 523 567
5,800 527 582 5,800 525 580 5,800 520 574
5,900 524 588 5,900 522 586 5,900 517 581
6,000 519 593 6,000 517 590 6,000 513 586
6,100 514 597 6,100 513 595 6,100 508 590
6,200 508 600 6,200 508 599 6,200 503 594
6,300 502 602 6,300 502 602 6,300 499 598
6,400 497 605 6,400 496 605 6,400 494 602
6,500 490 606 6,500 490 607 6,500 489 605
6,600 483 607 6,600 484 609 6,600 483 607
6,700 476 607 6,700 476 607 6,700 477 608
6,800 469 607 6,800 459 595 6,800 468 605
6,900 459 603 6,900 444 584 6,900 453 595
7,000 445 594 7,000 434 579 7,000 441 587
7,100 437 591 7,100 425 574 7,100 428 579

This magazine article testing produces some unexpected results, however the benefit of a duel plane manifold is clearly seen looking at the torque curve.

http://www.superchevy.com/how-to/engines-drivetrain/0905chp-camshaft-lobe-separation-angle-performance-test/

LOBE SEPARATION ANGLE EFFECTS
NARROWER LSA WIDER LSA
Increased overlap Reduced overlap
Increased low-rpm torque Improved top-end power
Narrower powerband Wider powerband
Reduced idle quality and vacuum Improved idle quality
Increased cranking compression Reduced cranking compression
Decreased piston-to-valve clearance Increased piston-to-valve clearance

 

406 STROKER SPECS
Displacement 406.0 ci
Bore x stroke 4.155 x 3.750
Rotating assembly Probe forged steel crank
  and rods
Pistons Probe forged
Heads Dart Pro 1 227 CNC
Compression 11.1:1

 

CAMSHAFT 1
107º LSA Comp Cams Hydraulic Roller
PN 12-000-8
Grind No. CS 3318S/3319S HR107+4
Gross valve lift 0.562/0.580 intake/exhaust
Valve lift w/ 1.6 rockers 0.600/0.619 intake/exhaust
Duration at 0.050 248/254 intake/exhaust
Valve timing (@ 0.050 lift) Open Close
Intake 21 BTDC 47º ABDC
Exhaust 58 BBDC 16º ATDC
Vacuum at 1,000 rpm 6 in

 

CAMSHAFT 2
110º LSA Comp Cams Hydraulic Roller
PN 12-444-8
Grind No. XR300HR
Gross valve lift 0.562/0.580 intake/exhaust
Valve lift w/ 1.6 rockers 0.600/0.619 intake/exhaust
Duration at 0.050 248/254 intake/exhaust
Valve timing (@ 0.050 lift) Open Close
Intake 18 BTDC 50º ABDC
Exhaust 61 BBDC 13º ATDC
Vacuum at 1,000 rpm 7 in

 

CAMSHAFT 3
113º LSA Comp Cams Hydraulic Roller
PN 12-000-8
Grind No. CS 3318S/3319 HR113+4
Gross valve lift 0.562/0.580 intake/exhaust
Valve lift w/ 1.6 rockers 0.600/0.619 intake/exhaust
Duration at 0.050 248/254 intake/exhaust
Valve timing (@ 0.050 lift) Open Close
Intake 15 BTDC 53º ABDC
Exhaust 64 BBDC 10º ATDC
Vacuum at 1,000 rpm 8 in

 

The numbers: Dual Plane vs. Single plane
DYNO DETAILS
Carburetor Holley 950 Ultra HP 75/79 jets with 1-in open spacer
Ignition MSD 7AL Digital
Headers Hedman 1 3/4-in long-tubes with 18-in extensions
Fuel 91-octane unleaded
Timing 37
Intake manifold Dart dual-plane

 

DUAL PLANE
107º LSA 110º LSA 113º LSA
Avg. torque 492 lb-ft Avg. torque 485 lb-ft Avg. torque 480 lb-ft
Avg. power 449 hp Avg. power 442 hp Avg. power 439 hp
RPM LB-FT HP RPM LB-FT HP RPM LB-FT HP
2,500 417 198 2,500 409 194 2,500 397 189
2,600 419 207 2,600 411 203 2,600 398 197
2,700 429 220 2,700 420 216 2,700 408 210
2,800 444 237 2,800 433 231 2,800 421 225
2,900 458 253 2,900 448 247 2,900 435 240
3,000 467 449  267 3,000 459 262 3,000 446 255
3,100 477 282 3,100 470 451  277 3,100 455 269
3,200 482 294 3,200 477 291 3,200 464 438  283
3,300 485 305 3,300 481 302 3,300 471 296
3,400 488 316 3,400 485 314 3,400 475 308
3,500 494 329 3,500 489 326 3,500 479 319
3,600 501 343 3,600 495 339 3,600 485 333
3,700 510 360 3,700 502 353 3,700 492 346
3,800 518 375 3,800 509 368 3,800 498 361
3,900 524 389 3,900 514 381 3,900 504 374
4,000 529 403 4,000 520 396 4,000 508 387
4,100 534 417 4,100 525 410 4,100 513 400
4,200 537 429 4,200 529 423 4,200 518 414
4,300 539 441 4,300 532 435 4,300 521 427
4,400 539 452 4,400 532 446 4,400 523 438
4,500 538 461 4,500 532 456 4,500 523 448
4,600 540 473 4,600 533 467 4,600 525 460
4,700 540 483 4,700 533 477 4,700 525 470
4,800 540 493 4,800 533 487 4,800 526 481
4,900 539 503 4,900 533 497 4,900 526 491
5,000 538 512 5,000 531 506 5,000 526 500
5,100 536 521 5,100 530 515 5,100 524 509
5,200 534 529 5,200 529 523 5,200 522 517
5,300 532 536 5,300 526 531 5,300 520 525
5,400 529 544 5,400 524 539 5,400 518 532
5,500 524 549 5,500 520 544 5,500 515 539
5,600 519 554 5,600 516 550 5,600 512 546
5,700 514 558 5,700 511 554 5,700 507 550
5,800 510 563 5,800 505 558 5,800 502 520  554
5,900 503 565 5,900 499 561 586  5,900 496 557
6,000 496 566 593  6,000 494 564 6,000 492 562
6,100 488 566 6,100 485 564 6,100 485 563
6,200 480 567 6,200 479 566 6,200 477 564
6,300 473 568 6,300 472 566 6,300 470 564
6,400 466 568 6,400 463 565 6,400 463 564
6,500 458 567 6,500 455 563 6,500 456 564
6,600 450 566 6,600 448 562 6,600 447 562
6,700 441 563 6,700 435 555 6,700 439 560
6,800 433 561 6,800 417 540 6,800 430 557
6,900 421 553 6,900 400 526 6,900 419 550
7,000 408 544 7,000 389 518 7,000 400 533
7,100 397 537 7,100 379 513 7,100 386 522