CHI small block Chevy 13 degree heads are the ultimate in wedge style Chevy performance. These CNC ported heads are designed for serious circle track or drag racers who want maximum performance. The CHI 13 degree head features extra tall intake ports, revised spark plug location, and a highly efficient combustion chamber significantly increasing horsepower potential. Suitable for applications well over 800HP.
As standard these heads come with CNC machined combustion chambers and ports, extra thick decks, machined for O’ring intake gaskets and reverse flow water passages.
Options include peripheral CNC machining (lightening), machining for down nozzles, Beryllium copper seats.
You have the option of bare heads or complete assemblies ready to bolt on. All CHI heads are fitted with hardened or bronze alloy valve seats and CHE Bronze Alloy valve guides making these heads suitable for the toughest environment.
| Head Model | Part No. | Assembled | Chamber | Valve Sizes Intake | Valve Sizes Exhaust | Exhaust Pattern | Intake Manifold | Application |
|---|---|---|---|---|---|---|---|---|
| 13 Degree | SBC13275B-55 | Bare | 55cc | 2.200 X 6.090 | 1.600 X 6.090 | Spread | Special Order | |
| SBC13275B-60 | Bare | 60cc | 2.200 X 6.090 | 1.600 X 6.090 | Spread | Special Order | ||
| SBC13275B-55-1 | Bare | 55cc | 2.200 X 6.090 | 1.600 X 6.090 | Spread | Special Order | ||
| SBC13275B-60-1 | Bare | 60cc | 2.200 X 6.090 | 1.600 X 6.090 | Spread | Special Order | ||
| SBC13275C5-55 | Competition | 55cc | 2.200 X 6.090 | 1.600 X 6.090 | Spread | Special Order | Race Solid Roller | |
| SBC13275C5-60 | Competition | 60cc | 2.200 X 6.090 | 1.600 X 6.090 | Spread | Special Order | Race Solid Roller | |
| SBC13275C6-55-1 | Competition | 55cc | 2.200 X 6.090 | 1.600 X 6.090 | Spread | Special Order | ||
| SBC13275C6-60-1 | Competition | 60cc | 2.200 X 6.090 | 1.600 X 6.090 | Spread | Special Order | ||
| SBC13CNC-Raw | Bare | as cast | N/A | N/A | Spread | Semi Finished suit CNC porting |
