BRODIX -18x Series Cylinder Heads/18 Top End Combo 9991002

CALL SHANON AT 507 445 3235 WITH ANY QUESTIONS.

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

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

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

STS 18 SP X    254cc          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

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CALL SHANON AT 507 445 3235 WITH ANY QUESTIONS.

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