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BRODIX designed the 12x12 Series for use in the dirt late model market.
The 12x12 has excellent wet flow characteristics due to a revised spark plug location. The combustion chamber and valve placement work extremely well with gasoline. The 12x12 RP has the same features as the 12x12 with improvements that include a raised valve cover rail, .500 taller intake ports, and a tall short side radius. The new style spark plug angle and combustion chamber design give the 12x12’s excellent torque and throttle response.
These cylinder heads are available in several CNC ported configurations.
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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 12x12 B - 275
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275 cc
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67 cc
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2.150/1.600
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Spread Port
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58/107
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HV 1800/HV 1801
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WP 12x12 B - 286
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286 cc
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67 cc
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2.180/1.600
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Spread Port
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58/107
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HV 1800/HV 1801
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WP 12x12 B - 296
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296 cc
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67 cc
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2.180/1.600
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Spread Port
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58/107
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HV 1800/HV 1801
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WP 12x12 SP RP
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299 cc
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64 cc
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2.200/1.600
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Spread Port
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58/125
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GM #24502653
Edelbrock #2955
With BRODIX
Spacers and Valley Plate
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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 12x12 SP B*
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380 - 421
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13.5 Minimum
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Roller
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4500-8000
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Oval Track/
Drag Race
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WP 12x12 SP RP
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415 - 460
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13.5 Minimum
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Roller
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4500-8000
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Oval Track/
Drag Race
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*WP 12x12 SP B are available in several intake port sizes. Ask a BRODIX representative which size would best fit your application.
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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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0.800
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WP 12x12 SP B - 275
(CNC Ported)
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2.150 Intake
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166
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236
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293
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333
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344
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346
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1.600 Exhaust
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112
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156
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188
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237
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249
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255
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WP 12x12 SP B - 286
(CNC Ported)
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2.180 Intake
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154
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228
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289
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334
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357
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360
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1.600 Exhaust
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112
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156
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188
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237
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249
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255
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WP 12x12 SP B - 296
(CNC Ported)
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2.180 Intake
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165
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230
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291
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338
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358
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376
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1.600 Exhaust
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112
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156
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188
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237
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249
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255
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WP 12x12 SP RP - 299
(CNC Ported)
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2.200 Intake
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154
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228
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290
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343
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375
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388
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399
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1.600 Exhaust
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119
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158
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216
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245
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254
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258
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263
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• PS CB:
Valve Bowls Blended
• PS MI:
Match Intake Port to BRODIX MG 1212
(12x12)
Match Intake Port to MG 2200
(12x12 RP)
• PS Valve Job:
Competition Valve Job
• Intake Valves:
2.180 x 5.540 o.a.l. - BR 60518D (12x12)
2.200 x 6.090 o.a.l. - BX 2200-609T (12x12 RP)
• Exhaust Valves:
1.600 x 5.540 o.a.l. - BR 60054 (12x12)
1.600 x 6.090 o.a.l. - BR 91600 (12x12 RP)
• 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 Intake Gaskets Are Available Exclusively From BRODIX®.
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• Torque Heads:
70 ft-lb
• Torque Rocker Studs:
40-45 ft-lb
• Intake Gaskets:
BRODIX MG 1212 (12x12)
BRODIX MG 2200 (12x12 RP)
• Head Gaskets:
350 - FEL-PRO 1003, COMETIC C5399
400 - FEL-PRO 1004, COMETIC C5403
• Exhaust Gaskets:
Spread Port-
BRODIX MG 52464, COMETIC C5424
• Head Studs:
ARP 234-4723
(12 pt with 3/8 Center Studs)(12x12)
BRODIX BR HSRP/GB CI BLK (12x12 RP) -
Available Exclusively From BRODIX
• 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:
12°
• Angle Milling:
.0065 in Per cc
• Flat Milling:
.0055 in Per cc
• Angle Machining:
Not Available
• Pushrod Slots:
58/107, 58/125
• Stud Girdle:
Not Available
• Rocker Arms:
JESEL or T&D Shaft System with 58/107, or 58/125
Spacing, Check Heads for Intake Offset
• Lifters:
.180 Offset
• Pistons:
Special 12°
• Pushrods:
Special Length
• Intake Face Angle:
BRODIX 10° (12x12)
BRODIX 5° (12x12 RP)
• Valve Covers:
VC 100 (12x12)
Sheet Metal (12x12 RP)
• Manifold:
HV 1800 or HV 1801 (12 X 12)
-Valley Tray and Spacers Required -
Available Exclusively From BRODIX
(12x12 RP)
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12x12 SP B Bare
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Spread Port Exhaust
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1120000
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WP 12x12 B 286 Bare
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Spread Port Exhaust
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1128002
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WP 12x12 B 286 Pkg
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Spread Port Exhaust
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1128101
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12x12 SP RP Bare
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Spread Port Exhaust
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1120001
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WP 12x12 RP 299 Bare
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Spread Port Exhaust
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1128006
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WP 12x12 RP 299 Pkg
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Spread Port Exhaust
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1128103
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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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© 2008 by Brodix, Inc.
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