Distributor 

 AFR Small Block Chevy Heads                                  Trick Flow Small Block Chevy heads

AFR Heads Dyno Tests Chevy                                    HPC Magazine AFR Test 

Dart SBC Heads                             Dart Exotic Heads              New Dart Platinum Heads            

                        Brodix SBC Heads             GM Fast Burn Heads  

                                       LT1 Heads                       

Vortec Heads     Tech on Heads including Vortec

COMPARING SBC CYLINDER HEADS           

 AFR Big Block Chevy Heads                                     Dart Big Block Chevy Heads

 Brodix BBC Chevy Heads                                         Edelbrock BBC Heads

 Canfield BBC Heads                       

LS1 AFR Mongoose Street Heads                              LS6 CNC300 HEADS

Several years ago, Muscle Mustangs and Fast Fords began extensive testing on the available heads
for the 5.0 Mustangs.  The articles began with the August 2003 issue and continued for quite a few
issues.  The following bench flow data was taken from these articles.  The data was all given at 28"
of water.  Included in these articles were how the heads performed on the dyno, valve sizes, spring
rates, compression ratios, combustion chamber sizes, and installation info.  The information in the
articles was extensive and worth purchasing a back copy if you really want to look into the
differences in the heads.  I've merely given a base sample of the testing figures as published.

This Information Is Provided to Give You Some idea Of The Power

 To Be Had From These Size Engines.

Dyno Tested Street Packages Featuring AFR Street Heads, AFR Hydraulic Cams, and AFR Manifolds

Efficient Cyclinder Heads + Small Camshaft = Gigantic Torque, Monster Horsepower and Great Street Ability. Compare our Low RPM Torque to the Competition. Don't be fooled by the other packages that require Camshafts 15° to 20° larger at .050 to get near our peak Horsepower

383 cid Small Block Chevy Package AFR 190cc Street Heads 9.5 to 1 Compression 1 3/4” Headers AFR FloPower RPM #5029 0-4779 750 cfm Holley Carb Comp Cams Hyd Roller Cam #12-433-8 MSD Distributor 36° Timing 93° Octane Pump Gas 350 cid Small Block Chevy Package AFR 180cc Street Heads 9 to 1 Compression 1 5/8” Headers AFR FloPower RPM #5029 600 cfm Holley Carb 110E Hyd Flat Cam Intake: .460 lift/218º @ .050, Exhaust: .470 lift/223º @ .050 110 lobe center, 800 RPM idle, 16 lbs. of vacuum     355ci Chevy Dyno Packages Power at Flywheel RPM Torque H.P. 2500 3000 3500 4000 4500 5000 5500 6000 394 411 434 469 470 446 410 356 189 234 288 356 403 424 430 407     Dyno Test Criteria Horsepower: Engine: Heads: Compression: Carburetor: Ignition: Cam: Exhaust: Fuel: Manifold 430 HP 355ci AFR Street 190 Heads 9.5 Holley 0-80779 750 cfm MSD Distributor 34° Timing Comp Cams 270 Magnum Hyd. Cam 224 @ .050 Dur  .470 Lift 1 5/8" Headers 93 Octane Pump Gas AFR #5029 Engine built and dyno tested by AFR RPM Torque H.P. 2500 3000 3500 4000 4500 5000 5500 6000 409 419 441 467 470 448 428 375 204 239 298 357 405 424 450 429     Dyno Test Criteria Horsepower: Engine: Heads: Compression: Carburetor: Ignition: Cam: Exhaust: Fuel: 450 HP 355cid AFR Street 190 Heads 9.5 Holley 0-4779 750 cfm MSD Distributor 36° Timing Comp Cams XR284HR Hyd Roller 230.236 @.050 Dur .502/.520 Lift 1 5/8" Headers 93 Octane Pump Gas AFR #5029 Street Power Flow Manifold   383ci Chevy Dyno Packages Power at Flywheel RPM Torque H.P. 2500 3000 3500 4000 4500 5000 5500 6000 432 450 475 513 515 488 449 390 207 257 316 390 441 464 471 446     Dyno Test Criteria Horsepower: Engine: Heads: Compression: Carburetor: Ignition: Cam: Exhaust: Fuel: 460 HP 383cid AFR Street 190 Aluminum Cyl. Heads 9.5 Holley 0-80779 750 cfm MSD Distributor 34° Timing Comp Cams 280 Magnum Hyd. Cam 230 @ .050 Dur .480 Lift 1 3/4" Headers 93 Octane Pump Gas   RPM Torque H.P. 2500 3000 3500 4000 4500 5000 5500 6000 448 459 483 501 501 488 469 411 223 262 326 381 429 464 491 470      Dyno Test Criteria Horsepower: Engine: Heads: Compression: Carburetor: Ignition: Cam: Exhaust: Fuel: 480 HP 383cid AFR Street 190 Aluminum Cyl. Heads 9.5 Holley 0-4779 750 cfm MSD Distributor 36° Timing Comp Cams XR284HR Hyd Roller 230.236 @.050 Dur .502/.520 Lift 1 3/4 Headers 93 Octane Pump Gas   RPM Torque H.P. 2500 3000 3500 4000 4500 5000 5500 6000 457 467 483 511 517 504 481 439 231 273 322 389 443 480 503 502           Dyno Test Criteria Horsepower: Engine: Heads: Compression: Carburetor: Ignition: Cam: Exhaust: Fuel: 500 HP 383cid AFR Street 190 Cyl. Heads 9.5 Holley 0-4779 750 cfm MSD Distributor 36° Timing Comp Cams XR288HR Hyd Roller Cam 236/242 @ .050 Dur .520/.540 Lift 1 3/4" Headers 93 Octane Pump Gas Edelbrock RPM Performer Manifold   RPM Torque H.P. 2500 3000 3500 4000 4500 5000 5500 6000 439 454 487 520 518 503 480 443 226 262 330 396 444 479 503 506              Dyno Test Criteria Horsepower: Engine:   Heads:   Compression: Carburetor: Ignition: Cam: Exhaust: Fuel:   500 HP  383cid AFR Street 190 CNC Competition Heads 9.4 BG Silver Claw 750 Carb. with 75/83 Jets MSD 85551 Distributor 36° Timing Comp Cams XR288HR Hyd Roller Cam 236/242 @ .050 Dur .520/.540 Lift 1 3/4" Headers 93 Octane Pump Gas Edelbrock RPM Performer Manifold   RPM Torque H.P. 4000 4500 5000 5500 6000 6500 7000 550 559 570 592 611 587 520 500 510 560 610 692 630 540           Dyno Test Criteria Horsepower: Engine: Heads: Compression: Carburetor: Ignition: Cam: Exhaust: Fuel: 690 HP 383cid Blown with 671 Weiand AFR 195 Competition Package 7.8 2 Holley 650 Double Pumpers MSD Billet Distributor 32° Timing Xtreme Energy Hyd Roller Comp Cams 230°/236° .544-.555 lift 114 Lobe Center 1 3/4 Headers 93 Octane Pump Gas     413ci Chevy Dyno Packages Power at Flywheel RPM Torque H.P. 4500 5000 5500 6000 6400 6600 6700 532 537 521 491 471 455 445 456 511 546 561 574 572 568 Dyno Test Criteria Horsepower: Engine: Heads: Compression: Carburetor: Ignition/Timing Cam: Exhaust: Fuel: Manifold: 574 HP 413cid AFR 195cc Cyl. Heads 10.5 to 1 750 carburator 36° Timing Custom Solid Roller 1 3/4 Header 92 Octane Pump Gas Holley #300-25 Extended Runner           406ci Chevy Dyno Packages Power at Flywheel RPM Torque H.P. 2500 3000 3500 4000 4500 5000 5500 6000 463 468 457 465 534 540 510 483 220 267 304 354 457 514 534 551         Dyno Test Criteria Horsepower: Engine: Heads: Compression: Carburetor: Ignition: Cam: Exhaust: Fuel: 550 HP 406cid AFR CNC Cyl. Heads 210cc Race Ready 10.3 750 Carb MSD HEI Billet Distributor 36° Timing Lunati Hyd. Roller Cams 232°/242° 0560-.570 lift W/ 1.6 Rockers 1 3/4" Headers 93 Octane Pump Gas   RPM Torque H.P. 4000 4500 5000 5500 6000 6500 7000 447 509 536 523 500 463 419 349 436 510 547 572 573 558      Dyno Test Criteria Horsepower: Engine: Heads: Compression: Carburetor: Ignition: Cam: Exhaust: Fuel: 570 HP 406cid AFR 210cc Competition Package 10.1 750 Carburator MSD Distributor @ 36° Timing Lunati Hyd. Roller Cams 242°-252° .560-.572 lift 112 Lobe Centers 1 7/8" Hedman Headers 93 Octane Pump Gas     434ci Chevy Dyno Packages Power at Flywheel RPM Torque H.P. 5000 5200 5400 5600 5800 6000 6200 6400 6600 6800 7000 752 766 776 778 786 780 781 776 766 759 751 716 758 798 830 868 891 922 946 963 983 1,001 Dyno Test Criteria Horsepower: Engine: Heads: Compression: Cam: Other Specs: 1,001 HP 434ci Blown ATI 0-2 AFR 210cc Cyl. Heads 10.1 Comp Cams Solid Roller ATI Supercharger 14psi Peak Boost.             LT-1 Chevy Dyno Packages Power to Rear Wheels RPM Torque H.P. 2500 3000 3500 4000 4500 5000 5500 6000 367 384 420 453 478 447 371 279 174 219 280 345 410 425 389 307 Dyno Test Criteria   383 LT-1 AFR Street LT-1 Cyl. Heads, Blower Cam, 9.0 Compression Ratio, Procharger 4-5psi Boost.           RPM Torque H.P. 3000 3500 4000 4500 5000 5500 6000 393 403 441 452 476 463 393 247 268 336 388 453 484 442 Dyno Test Criteria   355 LT-1 AFR Street LT-1 Cyl. Heads Steel Crank, Pink Rods, 8.4cr 12 psi Vortech , 6 speed .474/208° @.50 intake. .510/221° @.50 exhaust 112 Lobe Sep. ASM 1/ 3/4 Headers, 2.4lb. injectors, Carol Super Fueler.