The BRODIX BB-4 valve angles have been rolled 2° from stock to produce more torque and less chamber volume.
The BB-4 has 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 competitors low profile head slows down the air speed making the engine extremely lazy. If you want to take the next step up from a standard valve angle cylinder head, the BRODIX BB-4 is the ticket.
***The price in the shopping cart reflects a pair of heads***
- Ends milled and drilled for accessories
- 24° Valve angles
- Raised valve cover rail
- Best rocker stud bosses in the industry
| Cylinder Head Specifications |
| Intake Port | Chamber Volume | Valve Sizes Intake/Exhaust | Exhaust
Pattern | Valve
Centerline | Intake 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 |
| | | | | | |
| 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 |
| | | | | | |
| 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
4.600 Bore
(CNC Ported) | 2.350 Intake | 141 | 206 | 275 | 327 | 382 | 425 | 447 |
| 1.900 Exhaust | 122 | 156 | 190 | 222 | 245 | 263 | 276 |
| | | | | | | | |
| | | | | | | | |
Package Heads Include
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
