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 SP X Pkg Spread Port Exhaust 1181000 MAKE OFFER PER 2

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