The 18° Pro Stock style cylinder heads from BRODIX are the Big Dukes. The PB 1800 and PB 1801 were the original designs in this legendary series. The PB 1802 is a cast ported version of the PB 1800 capable of flowing over 480 cfm. The professionals at BRODIX have contoured each intake port, exhaust port, and combustion chamber to flow its maximum potential out of the box. The revolutionary PB 1803 cylinder heads from BRODIX feature oval intake ports, CNC combustion chambers, and use all standard components for the 18° Pro Stock head excluding the manifold. For the BP PB 1803, BRODIX contacted the best head porters in the business to incorporate our porting design into a 100% CNC ported masterpiece. The BP 1803 utilizes an as-cast intake port that delivers outstanding out-of-the-box performance. Copper valve seats and a 55° seat angle make either head an excellent choice when looking for serious torque and horsepower. All Big Duke series heads require special pistons, valve covers, head studs, shaft rockers, and intake manifold.
- Ends milled & drilled for accessories
- Raised intake & exhaust ports
- 18° Valve angles
- A-356 Virgin Aluminum
- Minimum 80HP Gain over stock bbc heads
** The price in the cart reflects a set of heads**
| Cylinder Head Specifications |
| Intake Port | Chamber Volume | Valve Sizes Intake/Exhaust | Exhaust Pattern | Intake Manifold |
| PB 1801 | 375 cc | 89 cc | 2.400/1.900 | Standard | PM 1800/PM 1810
PM 1903**/
PM 1913** |
| PB 1800 | 415 cc | 89 cc | 2.400/1.900 | Standard | PM 1800/PM 1810
PM 1903**/
PM 1913** |
| PB 1802 | 456 cc | 91 cc | 2.400/1.900 | Standard | PM 1800/PM 1810
PM 1903**/
PM 1913** |
| PB 1803 | 413 cc | 95 cc | 2.450/1.860 | Standard | PM 1803/PM 1813
PM 1903/PM 1913 |
| BP PB 1803 | 410 cc | 95 cc/ 91 cc* | 2.450/1.860 | Standard | PM 1803/PM 1813
PM 1903/PM 1913 |
| * Chamber Volume With Trick Titanium Valves
** Oval Port Manifold MUST Be Port Matched to Fit Rectangular Port Heads |
| Cylinder Head Recommendations |
| | Cubic Inch | Compression | Camshaft | RPM | Application |
| PB 1801 | 522 - 555 | 13.5 Minimum | Roller | 4500-7500 | Pro Street/
Drag Race/
Truck Puller |
| PB 1800 | 540 - 632 | 13.5 Minimum | Roller | 4500-7500 | Pro Street/
Drag Race/
Truck Puller |
| PB 1802 | 555 - 632 | 13.5 Minimum | Roller | 4500-7500 | Pro Street/
Drag Race/
Truck Puller |
| PB 1803 | 522 - 632 | 13.5 Minimum | Roller | 4500-7500 | Pro Street/
Drag Race/
Truck Puller |
| BP PB 1803 | 522 - 632 | 13.5 Minimum | Roller | 4500-7500 | Pro Street/
Drag Race/
Truck Puller |
| Flow Chart cfm @ 28" H20 |
| | Valve Size | 0.200 | 0.300 | 0.400 | 0.500 | 0.600 | 0.700 | 0.800 | 0.900 |
| PB 1801
(Hand Ported)
4.500 Bore
| 2.400 Intake | 162 | 245 | 312 | 367 | 411 | 442 | 463 | |
| 1.900 Exhaust | 129 | 180 | 222 | 269 | 301 | 308 | 315 | |
| PB 1800
4.600 Bore | 2.400 Intake | 117 | 184 | 256 | 328 | 391 | 435 | 453 | |
| 1.900 Exhaust | 113 | 166 | 211 | 239 | 252 | 259 | 264 | |
| PB 1802
4.600 Bore | 2.400 Intake | 135 | 205 | 280 | 351 | 409 | 449 | 480 | |
| 1.900 Exhaust | 100 | 151 | 193 | 234 | 265 | 296 | 306 | |
| PB 1802
(CNC Combustion
Chambers) | 2.400 Intake | 156 | 230 | 305 | 361 | 414 | 453 | 476 | |
| 1.900 Exhaust | 135 | 180 | 219 | 252 | 294 | 306 | 313 | |
| PB 1803
(CNC Combustion
Chambers) | 2.450 Intake | 137 | 217 | 296 | 362 | 418 | 464 | 484 | 490 |
| 1.860 Exhaust | 110 | 162 | 204 | 238 | 265 | 288 | 320 | 328 |
| BP PB 1803
(CNC Ported) | 2.450 Intake | 145 | 224 | 300 | 369 | 425 | 475 | 500 | 515 |
| 1.860 Exhaust | 126 | 172 | 211 | 245 | 270 | 318 | 338 | 351 |
Package Heads come fully assembled with the following options:
• PS CB:
Valve Bowls Blended
• PS MI:
Match Intake Port to FP 1298
(PB 1800-1802)
Match Intake Port to BRODIX MG 2013
(PB 1803)
• PS Valve Job:
Competition Valve Job
• Intake Valves:
2.400 x 6.600 o.a.l. - BR 81660,
45° Seat Angle (PB 1800-1802)
2.450 x 6.650 o.a.l. - BR 81665,
55° Seat Angle (PB 1803)
• Exhaust Valves:
1.900 x 6.450 o.a.l. - BR 81645,
45° Seat Angle (PB 1800-1802)
1.860 x 6.550 o.a.l. - BR 81685,
55° Seat Angle (PB 1803)
• Valve Springs:
1.625 Roller Valve Spring - MA 221424,
260 lb Closed, 790 lb Open
2.100 Installed Height,
.800 Maximum Lift
1.645 Roller Valve Spring - CC 948,
315 lb Closed, 915 lb Open,
2.100 Installed Height,
.850 Maximum Lift
• Retainers:
1.625 10° Titanium - MA 23640
1.645 10° Titanium - MA 2001
• Valve Locks:
10° Jumbo - CC 611
• Rocker Studs:
Shaft System Required
• Valve Seals:
11/32 - US VS529V (1.625 Valve Spring)
11/32 - US VS485V (1.645 Valve Spring)
