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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 customer's needs.
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Intake Port
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Chamber Volume
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Valve Sizes Intake/Exhaust
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Exhaust
Pattern
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Valve
Centerline
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Intake Manifold
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WP 12 SP RI
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247/262 cc
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60 cc
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2.150/1.600
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Spread Port
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40/60
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MS 89
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WP 12 SP RI MC
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262 cc
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61 cc
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2.170/1.600
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Spread Port
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58/107
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N/A
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KC 12 SP B
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287 cc
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61 cc
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2.150/1.600
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Spread Port
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40/60
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HV 1200/
HV 1201
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STS 12 SP WB MC
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305 cc
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69 cc
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2.200/1.600
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Spread Port
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70/125
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HV 1200/
HV 1201
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Cubic Inch
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Compression
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Camshaft
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RPM
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Application
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WP 12 SP RI
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358 - 410
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13.5 Minimum
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Roller
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4000-7500
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Oval Track/
Drag Race With Nitrous
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WP 12 SP RI MC
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358 - 410
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13.5 Minimum
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Roller
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4000-7500
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Oval Track/
Drag Race With Nitrous
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KC 12 SP B
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406 - 430
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13.5 Minimum
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Roller
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4000-7500
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Oval Track/
Drag Race With Nitrous
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STS 12 SP WB MC
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421 - 440
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13.5 Minimum
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Roller
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4000-7500
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Oval Track/
Drag Race With Nitrous
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Valve Size
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0.200
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0.300
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0.400
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0.500
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0.600
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0.700
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WP 12 SP RI - 247
(CNC Ported)
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2.150 Intake
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152
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230
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284
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316
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326
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330
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1.600 Exhaust
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120
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170
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216
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233
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240
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248
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WP 12 SP RI - 262
(CNC Ported)
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2.150 Intake
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150
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228
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282
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322
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330
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335
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1.600 Exhaust
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120
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170
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216
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233
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240
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248
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WP 12 SP RI MC - 262
(CNC Ported)
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2.170 Intake
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155
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224
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282
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329
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335
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347
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1.600 Exhaust
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117
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177
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218
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231
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240
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247
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KC 12 SP B
(CNC Ported)
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2.150 Intake
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155
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230
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284
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320
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343
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354
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1.600 Exhaust
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120
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168
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216
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232
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240
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247
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STS 12 SP WB MC
(CNC Ported)
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2.200 Intake
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159
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233
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290
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334
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361
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372
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1.600 Exhaust
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106
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145
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190
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221
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235
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247
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• 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
(KC 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
Special Spread Port Exhaust Gaskets Are Available Exclusively From BRODIX
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• 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
(KC 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
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12 SP P Bare
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Spread Port Exhaust
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1150004
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WP 12 SP RI 247 Bare
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Spread Port Exhaust
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1158005
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WP 12 SP RI 262 Bare
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Spread Port Exhaust
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1158002
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12 SP B Bare
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Spread Port Exhaust
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1150000
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KC 12 SP B Bare
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Spread Port Exhaust
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1158000
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KC 12 SP B Pkg
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Spread Port Exhaust
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1158100
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STS 12 SP WB MC Bare
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Spread Port Exhaust
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1158004
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Untitled Page
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Phone: (479) 394-1075 • Fax: (479) 394-1996 • 301 Maple • P.O. Box 1347 • Mena, Arkansas 71953
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| Not legal for sale or use on pollution controlled motor vehicles. |
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© copyright 2013 by Brodix, Inc.
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