THE BIG DUKE® PB 1800™ Series/18°


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 PB 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.

Package Heads

Facts and Related Components

• PS CB:
Valve Bowls Blended

• PS MI:
Match Intake Port to FP 1298
(PB 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:
1.640 Roller Valve Spring – MA 221424,
250 lb Closed, 745 lb Open
2.050 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)

• Torque Heads:
70 ft-lb

• Torque Rocker Studs:
40-45 ft-lb

• Intake Gaskets:
FEL-PRO 1298, COMETIC C5419
(PB 1800-1802)
BRODIX MG 2013
(PB 1803, BP PB 1803)

• Head Gaskets:
4.540 – FEL-PRO 1017, COMETIC C5433
4.600 – FEL-PRO 1057, COMETIC C5434

• Exhaust Gaskets:
FEL-PRO 1412, COMETIC C5418

• Head Studs:
ARP 235-4712 (12 pt)

• Accessory Bolt Holes Are Drilled

• Spark Plug Starting Points:
NGK R5671A-10
for Alcohol
NGK R5671A-9
for Racing Gas

• Spring Pockets:
May Not be Cut Any Larger
or Deeper Than 1.750

• Valve Angle:
18° and 4° Intake,
9° and 4° Exhaust

• Angle Milling:
Not Available

• Flat Milling:
.0055 in Per cc

• Angle Machining:
Not Available

• Dowel Shift:
Not Available

• Pushrod Slots:
Standard

• Rocker Arms:
Shaft System – T&D 3036, JESEL KPS 22797

• Lifters:
Standard

• Pistons:
Standard 18° x 9° Valve Angle

• Pushrods:
Check Pushrod Clearance with Head Installed on the
Engine Block Before Final Assembly.

• 4.375 Minimum Bore

• Intake Manifold:
PM 1800 / PM 1810 / PM 1903* / PM 1913* (PB 1802)
PM 1803 / PM 1813 / PM 1903 / PM 1913 (PB 1803, BP PB 1803)

* Oval Port Manifold MUST Be Port Matched to Fit Rectangular Port Heads

Flow Chart cfm @ 28″ H20

Part Number Valve Size 0.200 0.300 0.400 0.500 0.600 0.700 0.800 0.900
PB 1802
4.600 Bore
2.400 Intake 45° 135 205 280 351 409 449 480  
1.900 Exhaust 45° 100 151 193 234 265 296 306  
PB 1802
(CNC Combustion
Chambers)
2.400 Intake 45° 156 230 305 361 414 453 476  
1.900 Exhaust 45° 135 180 219 252 294 306 313  
PB 1803
(CNC Combustion Chambers)
2.450 Intake 55° 137 217 296 362 418 464 484 490
1.860 Exhaust 55° 110 162 204 238 265 288 320 328
BP PB 1803
(CNC Ported)
2.450 Intake 55° 145 224 300 369 425 475 500 515
1.860 Exhaust 55° 126 172 211 245 270 318 338 351

Basic Easy Order Numbers

Part# Easy
Order #
Port
Vol.
Cham.
Vol.
Int/Ext
Valve
Spring Seat
Pressure
Spring
Diam.
Ret.
ST/TI
Per
PB 1802 Bare 2180001 456 91         1
PB 1802 Pkg 2181002 456 91 2.400 / 1.900 250 1.625 TI 1
** PB 1802 Pkg ** 2181003 456 91 2.400 / 1.900 315 1.645 TI 1
PB 1802 SPECIAL 2189001 CUSTOM ORDER           1
PB 1803 Bare 2180003 413 95         1
PB 1803 Pkg 2181006 413 95 2.450 / 1.860 250 1.625 TI 1
PB 1803 Pkg 2181007 413 95 2.450 / 1.860 315 1.645 TI 1
BP PB 1803 Bare 2188001 410 95         1
BP PB 1803 Pkg
2188102 410 95 2.450 / 1.860 250 1.625 TI 1
BP PB 1803 Pkg 2188103 410 95 2.450 / 1.860 315 1.645 TI 1
BP PB 1803 Pkg
2188104 410 91 2.450TI / 1.860TI 250 1.625 TI 1
**Indicates most popular packages sold. **