BRODIX BBC BB-4 AND BB-5 SERIES CYLINDER HEADS/24 2041004

CALL SHANON AT 507 445 3235 WITH ANY QUESTIONS.

The BRODIX -4 and -5 valve angles have been rolled 2° from stock to produce more torque and less
chamber volume. The -4 and -5 have a raised intake port design (approximately .400”) allowing the
short-turn radius a better air flow angle without sacrificing velocity. Our competitors offer a similar
version of these heads, but they have larger intake ports in the stock location. The competitor ’s low
profile head slows down the air speed making the engine extremely lazy. When Sonny Leonard designed
the -5 cylinder head for larger cubic inch engines, he incorporated the most important things: correct
port shape, volume, and velocity. If you want to take the next step up from a standard valve angle
cylinder head, the BRODIX -4 or -5 is the ticket.

Package Heads:

• PS CB: VALVE BOWLS BLENDED• PS MI: MATCH INTAKE PORT TO BRODIX MG 2001• PS Valve Job: COMPETITION VALVE JOB• Intake Valves: 2.300 X 5.468 o.a.l. - BR 81241 (STANDARD PACKAGE) 2.300 X 5.568 o.a.l. - BR 81341 (SPRING UPGRADE) 2.350 X 5.568 o.a.l. - BR 81351 (SPRING UPGRADE)• Exhaust Valves: 1.880 X 5.394 o.a.l. - BR 81038 (STANDARD PACKAGE) 1.880 X 5.494 o.a.l. - BR 81138 (SPRING UPGRADE) 1.900 X 5.494 o.a.l. - BR 81139 (SPRING UPGRADE)• Valve Springs: 1.550 ROLLER VALVE SPRING - GA 1000, 240 lb CLOSED, 550 lb OPEN, 1.950 INSTALLED HEIGHT, .700 MAXIMUM LIFT (STANDARD PACKAGE) 1.625 ROLLER VALVE SPRING - MA 221424, 260 lb CLOSED, 790 lb OPEN, 2.100 INSTALLED HEIGHT, .800 MAXIMUM LIFT (SPRING UPGRADE)• Retainers: 1.550 10° STEEL - CC 752 1.625 10° TITANIUM - MA 23640• Valve Locks: 10° JUMBO - CC 611• Rocker Studs: 7/16 - BR 716L, AR RRS-4I• Guide Plates: 3/8 - CC 4806• 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 2001, COMETIC C5428, FEL-PRO 1252-3• Head Gaskets: 4.310 - FEL-PRO 1027, COMETIC C5432 4.540 - FEL-PRO 1017, COMETIC C5433 4.600 - FEL-PRO 1057, COMETIC C5434• Exhaust Gaskets: FEL-PRO 1411, COMETIC C5429• Head Bolts: ARP 135-3606, MANLEY 42192• Head Studs: ARP 235-4702 (12 pt)• Accessory Bolt Holes Are Drilled• Spark Plug Starting Points: NGK R5671A-9 FOR ALCOHOL NGK R5671A-8 FOR RACING GAS• Spring Pockets: MAY NOT BE CUT ANY LARGER OR DEEPER THAN 1.625• Valve Angle: 24° AND 4° INTAKE, 15° AND 4° EXHAUST• Angle Milling: .0066 in PER cc• Flat Milling: .0050 in PER cc• Angle Machining: NOT AVAILABLE• Dowel Shift: NOT AVAILABLE• Pushrod Slots: STANDARD• Stud Girdle: STANDARD, BRODIX 1230• Rocker Arms: STANDARD• Lifters: STANDARD• Pistons: 2° VALVE ROLLED PISTON• Pushrods: CHECK PUSHROD CLEARANCE WITH HEAD INSTALLED ON THE ENGINE BLOCK BEFORE FINAL ASSEMBLY

                                   INTAKE        CHAMBER     VALVE SIZES          EXHAUST            VALVE                        INTAKE 

                                     PORT            VOLUME           INT./EXH.              PATTERN      CENTERLINE              MANIFOLD

BB-4                           340 cc              119 cc            2.300/1.880             Standard            Standard           SA 2012 / SA 2020
STS BB-4 XTRA      390 cc              119 cc            2.350/1.880-1.900  Standard            Standard           SA 2012 / SA 2020
BB-5                           387 cc              119 cc            2.350/1.900             Standard            Standard           SA 2012 / SA 2020

 Cylinder Head recommendations:

              CUBIC INCH       COMPRESSION     CAMSHAFT           RPM                       APPLICATION

BB-4                       509 - 555                  13.1 Minimum                   Roller                 4000 - 7500                    Pro Street / Drag Race
STS BB-4 XTRA   565 - 632                  13.1 Minimum                   Roller                 4000 - 7500                    Pro Street / Drag Race
BB-5                       565 - 632                  13.1 Minimum                   Roller                  4000 - 7500                   Pro Street / Drag Race

Flow Chart CFM @ 28" H20

                                           VALVE SIZE       0.200       0.300      0.400       0.500     0.600       0.700     0.800  

BB-4                                            2.300 INTAKE             151              211              261             303            334              361
                                                     1.880 EXHAUST          132              161             188              216            236              252
STS BB-4 XTRA                        2.350 INTAKE             141              206              275             327             382             425             447
4.600 BORE (CNC Ported)        1.900 EXHAUST         122              156              190             222             245             263             276
BB-5                                            2.350 INTAKE             108              150              203             258             309             354             384
                                                     1.900 EXHAUST          77               103              134             167             200             222             238

BASIC EASY ORDER NUMBER:

1.550 spring diam.

• BB-4 Pkg 119 Chamber 2041004 MAKE OFFER PER 1

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