The BB-1 rectangular port head has a 280 cc intake port and a 119 cc combustion chamber, but may be angle milled to 108 cc or angle machined to 98 cc. The BB-1 is designed for a 396 to 502 engine with a flat tappet or hydraulic cam. Most marine applications use this head for torque and throttle response. The BB-1 also comes completely CNCported. The 305 cc intake port flows over 370 cfm and has maximum port velocity. The BB-1 cylinder heads accept standard pistons, intake manifolds, and rocker arms. The exhaust ports are raised .600 higher than stock, and the valve cover rails are now raised to assure no oil leakage. **Heads are being sold as pairs and bare**
- Ends milled and drilled for accessories
- Raised valve cover rails
- A-356 virgin aluminum: easily repaired
- Ductile iron valve seats for use with unleaded fuel
- Strongest castings in the business
| Cylinder Head Specifications |
| Intake Port | Chamber Volume | Valve Sizes Intake/Exhaust | Exhaust
Pattern | Valve
Centerline | Intake Manifold |
| BB-1 | 280 cc | 119 cc | 2.250/1.880 | Standard | Standard | HV 2016/
HV 2000 |
| STS BB-1 | 305 cc | 119 cc | 2.250/1.880 | Standard | Standard | HV 2000/
HV 2001 |
| Cylinder Head Recommendations |
| Cubic Inch | Compression | Camshaft | RPM | Application |
| BB-1 | 396 - 502 | 10.5 Minimum | Hydraulic Roller/
Flat Tappet | 2000-6500 | Pro Street/
Drag Racing |
| STS BB-1 | 427-502 | 12.0 Minimum | Flat Tappet/Roller | 3500-7000 | 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-1 | 2.250 Intake | 150 | 209 | 259 | 290 | 300 | 303 | |
| 1.880 Exhaust | 106 | 137 | 166 | 190 | 211 | 225 | |
STS BB-1
(CNC Ported) | 2.250 Intake | 168 | 252 | 314 | 348 | 368 | 375 | 379 |
| 1.880 Exhaust | 130 | 166 | 200 | 235 | 264 | 283 | 295 |
