The BRODIX 18X offers the best of both worlds, 18° horsepower without using expensive shaft rockers or offset lifters. This head offers a dramatic horsepower increase over the previous 23° cylinder head. Several advantages of the 18X are intake ports that flow over 320 cfm out of the box, an intake valve size of 2.140, raised intake ports, and shallow combustion chambers. The 18X is an excellent choice for the budget-minded racer who wants to go fast.

Package Heads:

• PS CB: VALVE BOWLS BLENDED • PS MI: MATCH INTAKE PORT TO BRODIX MG 1800 • PS Valve Job: COMPETITION VALVE JOB • Intake Valves: 2.140 X 5.290 o.a.l. - BR 81050• Exhaust Valves: 1.600 X 5.300 o.a.l. - BR 81051• 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: 7/16 - BR 716L, AR RRS-4I • Guide Plates: 5/16 - BR 5160 • Valve Seals: 11/32 - US VS529V

FACTS AND RELATED COMPONENTS:

• Torque Heads: 70 ft-lb • Torque Rocker Studs: 40-45 ft-lb • Intake Gaskets: BRODIX MG 1800, COMETIC C3250 • Head Gaskets: 350 - FEL-PRO 1003, COMETIC C5399 400 - FEL-PRO 1004, COMETIC C5403• Exhaust Gaskets: STANDARD - FEL-PRO 1406, COMETIC C5415 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-9 FOR ALCOHOL NGK R5671A-8 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: 40/60 • Stud Girdle: 40/60 - BR 6440 • Rocker Arms: STANDARD 7/16 ROLLER ROCKERS OR SHAFT SYSTEM WITH 40/60 SPACING • Lifters: STANDARD • Pistons: SPECIAL 18° • Pushrods: SPECIAL LENGTH • Intake Face Angle: BRODIX 10° STANDARD

Cylinder Head Specifications:

INTAKE PORT CHAMBER VOLUME VALVE SIZES INTAKE/EXHAUST EXHAUST PATTERN VALVE CENTERLINE INTAKE MANIFOLD

18 STD X          244 cc        68 cc        2.140/1.600         Angle         Standard         40/60         HV 1800 / HV 1801

18 SP X             244 cc        68 cc        2.140/1.600         Angle         Spread Port    40/60         HV 1800 / HV 1801

STS 18 STD X   254 cc        68 cc        2.140/1.600         Angle          Standard        40/60         HV 1800 / HV 1801

STS 18 SP X      254 cc       68 cc         2.140/1.600         Angle         Spread Port     40/60        HV 1800 / HV 1801

Cylinder Head Recommendations:

                CUBIC INCH         COMPRESSION       CAMSHAFT             RPM                                       APPLICATION

18 STD X         358 - 430        13.5 Minimum         Roller        4000 - 7500        Oval Track / Drag Race / Pro Street

18 SP X            358 - 430        13.5 Minimum         Roller        4000 - 7500       Oval Track / Drag Race / Pro Street

STS 18 STD X  358 - 430        13.5 Minimum         Roller        4000 - 7500       Oval Track / Drag Race / Pro Street

STS 18 SP X     358 - 430        13.5 Minimum         Roller        4000 - 7500       Oval Track / Drag Race / Pro Street

                              VALVE SIZE          0.200           0.300         0.400         0.500           0.600         0.650          0.700

18 STD X           2.140 INTAKE             157               212             260              303              319              321              325

                           1.600 EXHAUST            106               145              179              195              205              209              211

18 SP X              2.140 INTAKE             157               212             260               303              319              321             325

                           1.600 EXHAUST            122               164              200              217              226              230              233

STS 18 STD X   2.140 INTAKE             145               214              261             303              328               331             336

(CNC Ported)    1.600 EXHAUST          110               154              206              224              231             234              237

STS 18 SP X      2.140 INTAKE             145               214              261              303              328              331             336

(CNC Ported)    1.600 EXHAUST          119               158              196              232              243              247             250 

BASIC EASY ORDER NUMBER:

• 18 STD X Pkg Standard Exhaust 1181002 MAKE OFFER PER 2

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