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The 100% CNC ported LM 12 STD is the latest in dirt late model technology. It features a 12° valve angle, 85 / 134 valve spacing, and newly designed intake and exhaust ports. The intake port on this head flows 387 cfm with a 2.180 valve. The exhaust port flows 270 cfm with a 1.625 valve.
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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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WP LM 12 STD
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300 cc
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49 cc
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2.180/1.625
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Raised
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18° Standard
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85/134
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TBA
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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 LM 12 STD
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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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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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0.750
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0.800
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WP LM 12 STD
(CNC Ported)
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2.180 Intake
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155
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236
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305
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352
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375
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384
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386
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387
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1.625 Exhaust
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111
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155
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215
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243
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254
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263
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267
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270
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• PS CB:
Valve Bowls Blended
• PS MI:
Match Intake Port to BRODIX MG 1215
• PS Valve Job:
Competition Valve Job
• Intake Valves:
2.180 x 5.740 o.a.l. -
BX 2180-574T (Titanium)
2.180 x 5.740 o.a.l. -
BR 60718D (Steel)
• Exhaust Valves:
1.625 x 5.740 o.a.l. - BR 60174D
• 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
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• Torque Heads:
70 ft-lb
• Torque Rocker Studs:
40-45 ft-lb
• Intake Gaskets:
BRODIX MG 1215
• Head Gaskets:
350 - FEL-PRO 1003, COMETIC C5399
400 - FEL-PRO 1004, COMETIC C5403
• Exhaust Gaskets:
FEL-PRO 1407
• Head Studs:
BRODIX SK HSSB 13 (Aluminum Block)
• 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
• Pushrods:
Special Length
• Rocker Arms:
Shaft System - T&D 22076
• Lifters:
.180 Offset
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LM 12 STD CNC Bare
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49 Chamber
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1120002
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WP LM 12 STD
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49 Chamber
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1128008
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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 2010 by Brodix, Inc.
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