12™ Series/15°


In the mid 1980’s, BRODIX was the first company to offer a “rolled over” valve angle cylinder head. Since then, the -12 cylinder head has won thousands of late model and sprint car races and is still winning races today.
BRODIX has taken this design even further by adding raised intake ports, several valve spacings, and more efficient combustion chambers.
The -12 cylinder head is available in several port sizes to fulfill our customers’ needs.

Package Heads

Facts and Related Components

• PS CB:
Valve Bowls Blended

• PS MI:
Match Intake Port to FP 1263
(WP 12 SP RI, WP 12 SP RI MC)
Match Intake Port to FP 1209
(BP 12 SP B, STS 12 SP WB MC)

• PS Valve Job:
Competition Valve Job

• Intake Valves:
2.150 x 5.440 o.a.l. – BR 60415 (40/60)
2.200 x 5.440 o.a.l. (70/125)

• Exhaust Valves:
1.600 x 5.440 o.a.l. – BR 60044

• Valve Springs:
1.550 Roller Valve Spring – GA 1000,
240 lb Closed, 550 lb Open,
1.950 Installed Height,
.700 Maximum Lift

• Retainers:
1.550 10° Titanium – MA 2398BR

• Valve Locks:
10° Jumbo – CC 611

• Rocker Studs:
Shaft System Required

• Valve Seals:
11/32 – US VS529V

• Torque Heads:
70 ft-lb

• Torque Rocker Studs:
40-45 ft-lb

• Intake Gaskets:
FEL-PRO 1263
Ask for COMETIC Part Number
(WP 12 SP RI, WP 12 SP RI MC)
FEL-PRO 1209
(BP 12 SP B, STS 12 SP WB MC)

• Head Gaskets:
350 – FEL-PRO 1003, COMETIC C5399
400 – FEL-PRO 1004, COMETIC C5403

• Exhaust Gaskets:
Spread Port-
BRODIX MG 52464 (trim to fit),
COMETIC C5424

• Head Studs:
ARP 234-4723
(12 pt With 3/8 Center Studs)

• Accessory Bolt Holes Are Drilled

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

• Spring Pockets:
1.550 Out of the Box, May Be Cut to
1.625 – No Larger or Deeper

• Valve Angle:
15°

• Angle Milling:
.0065 in per cc

• Flat Milling:
.0055 in per cc

• Angle Machining:
Not Available

• Pushrod Slots:
40/60, 58/107, 70/125

• Stud Girdle:
Not Available

• Rocker Arms:
Shaft System With 40/60, 58/107, or 70/125 Spacing,
Check Heads for Intake Offset
40/60 – T&D 2206, JESEL KPS 01204
58/107 – T&D 2207
70/125 – T&D 22071

• Lifters:
.180 Offset

• Pistons:
Special 15°

• Pushrods:
Special Length

• Intake Face Angle:
BRODIX 10° Standard

• Valve Centerline:
40/60 (WP 12 SP RI, BP 12 SP B)
58/107 (WP 12 SP RI MC)
70/125 (STS 12 SP RI MC)

• Intake Manifolds:
MS 89 (WP 12 SP RI MC)
N/A (WP 12 SP RI MC)
HV 1200 / HV 1201 (BP 12 SP B,
STS 12 SP W B MC)

Flow Chart cfm @ 28″ H20

Valve Size
0.200
0.300
0.400
0.500
0.600
0.700
WP 12 SP RI – 247
(CNC Ported)
2.150 Intake 152 230 284 316 326 330
1.600 Exhaust 120 170 216 233 240 248
WP 12 SP RI – 262
(CNC Ported)
2.150 Intake 150 228 282 322 330 335
1.600 Exhaust 120 170 216 233 240 248
WP 12 SP RI MC – 262
(CNC Ported)
2.170 Intake 155 224 282 329 335 347
1.600 Exhaust 117 177 218 231 240 247
BP 12 SP B
(CNC Ported)
2.150 Intake 155 230 284 320 343 354
1.600 Exhaust 120 168 216 232 240 247
STS 12 SP W B MC
(CNC Ported)
2.200 Intake 159 233 290 334 361 372
1.600 Exhaust 106 145 190 221 235 247

Basic Easy Order Numbers

Part# Easy
Order #
Port
Vol.
Cham.
Vol.
Int/Ext
Valve
Spring Seat
Pressure
Spring
Diam.
Ret.
ST/TI
Per
12 SP P Bare
1150004 230 68 2
12 SP B Bare
1150000 270 68 2
12 SP B MC Bare
1150001 270 68 2
12 SP W B Bare
1150005 280 68 2
12 SP W B MC Bare
1150006 280 68 2
BP 12 SP B Bare
1158000 287 61 2
BP 12 SP B Pkg
1158100 287 61 2.150 / 1.600 240 1.550 TI 2
BP 12 SP B Bare W/DN
1158001 287 61 2
WP 12 SP B Pkg W/DN
1158101 287 61 2.150 / 1.600 240 1.550 TI 2
BP 12 SP B Special
1159000 Customer Order 2
WP 12 SP RI 247 Bare
1158005 247 60 2
WP 12 SP RI 247 Pkg
1158102 247 60 2.150 / 1.600 240 1.550 TI 2
WP 12 SP RI 247 Bare W/DN
1158006 247 60 2
WP 12 SP RI 247 Pkg W/DN
1158103 247 60 2.150 / 1.600 240 1.550 TI 2
WP 12 SP RI 262 Bare
1158002 262 60 2
WP 12 SP RI 262 Pkg
1158104 262 60 2.150 / 1.600 240 1.550 TI 2
WP 12 SP RI 262 Bare W/DN
1158003 262 60 2
WP 12 SP RI 262 Pkg W/DN
1158105 262 60 2.150 / 1.600 240 1.550 TI 2
STS 12 SP WB MC Bare
1158004 305 69 2
STS 12 SP WB MC Pkg
1158106 305 69 2.200 / 1.600 240 1.550 TI 2

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