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
Flow Chart CFM @ 28" H20VALVE 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:
• STS 18 SP X Bare Spread Port Exhaust 1188000 MAKE OFFER PER 2
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Warning: May cause cancer and reproductive harm.
