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The BRODIX 18 C cylinder head has an 18° valve angle that works well on dirt late model or serious drag racing applications.
This head has special valve centerlines and dowel location requiring special components. Interlocking valve seats are installed along with replaceable phosphorous bronze guides.
The combustion chambers may be angle machined down to the mid 40 cc range without weakening the deck surface. The
18 C has two exhaust bolt patterns available and a 5° intake face requiring a special intake manifold and components.
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Intake Port
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Chamber Volume
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Valve Sizes Intake/Exhaust
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Plug Angle
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Exhaust
Pattern
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Valve
Centerline
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Intake Manifold
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18 SP C
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185 cc
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40 cc
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2.180/1.625
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Angle
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Spread Port
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58/107
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HV 1813/
HV 1814
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18 STD C
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185 cc
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40 cc
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2.180/1.625
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Angle
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18° Standard
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58/107
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HV 1813/
HV 1814
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WP 18 SP C*
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254 cc
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56 cc
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2.180/1.625
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Angle
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Spread Port
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58/107
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HV 1813/
HV 1814
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KC 18 SP C
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254 cc
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56 cc
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2.180/1.625
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Angle
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Spread Port
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58/107
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HV 1813/
HV 1814
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WP 18 SP C AP
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266 cc
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57 cc
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2.180/1.625
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Angle
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Spread Port
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58/107
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HV 1813/
HV 1814
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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 18 SP C*
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358 - 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
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KC 18 SP C
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358 - 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
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WP 18 SP C AP
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358 - 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
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* WP 18 SP C 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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WP 18 SP C
HUT 921.4 A
(CNC Ported)
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2.180
Intake
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157
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230
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280
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329
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360
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367
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1.625
Exhaust
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112
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167
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209
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227
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238
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245
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KC 18 SP C
(CNC Ported)
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2.180
Intake
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163
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232
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288
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335
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351
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360
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1.625
Exhaust
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119
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172
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214
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233
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242
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250
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WP 18 SP C AP
(CNC Ported)
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2.180
Intake
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154
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224
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278
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328
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369
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395
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1.625
Exhaust
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134
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175
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241
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261
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270
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274
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• PS CB:
Valve Bowls Blended
• PS MI:
Match Intake Port to FP 1282
• PS Valve Job:
Competition Valve Job
• Intake Valves:
2.180 x 5.540 o.a.l. - BR 60518D
• Exhaust Valves:
1.625 x 5.540 o.a.l. - BR 60154
• 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:
Modified FEL-PRO 1282
• 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 234-4727
(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:
18°
• Angle Milling:
.0065 in per cc
• Flat Milling:
.0055 in per cc
• Angle Machining:
Not Available
• Pushrod Slots:
58/107
• Stud Girdle:
Not Available
• Rocker Arms:
JESEL or T&D Shaft System With 58/107 Spacing,
Check Heads for Intake Offset
• Lifters:
.180 Offset
• Pistons:
Special 18°
• Pushrods:
Special Length
• Intake Face Angle:
5°
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18 SP C Bare
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Spread Port Exhaust
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1180003
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18 STD C Bare
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Standard Exhaust
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1180005
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WP 18 SP C Bare
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Spread Port Exhaust
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1188001
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WP 18 SP C Pkg
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Spread Port Exhaust
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1188102
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KC 18 SP C Bare
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Spread Port Exhaust
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1188004
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KC 18 SP C Pkg
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Spread Port Exhaust
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1188106
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WP 18 SP C AP Bare
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Spread Port Exhaust
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1188003
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WP 18 SP C AP Pkg
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Spread Port Exhaust
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1188105
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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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© 2009 by Brodix, Inc.
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