Yella Terra Holden 6 Blue/Black 12-Port Alloy Cylinder Head — 56cc Assembled — ACHA 33C56
Yella Terra Holden 6 Blue/Black 12-Port Alloy Cylinder Head — 56cc Assembled — ACHA 33C56
Yella Terra’s assembled 56 cc alloy 12-port cylinder head is a performance replacement for compatible Holden Blue/Black straight-six combinations. The casting uses heat-treated 356-T6 aluminium and a revised port/chamber layout aimed at improved airflow, cooling and weight reduction compared with the original iron head.
Assembled 56 cc specification
- 56 cc combustion chambers for standard/high-compression-style combinations.
- 12-port Holden inline-six layout.
- 356-T6 aluminium construction.
- Supplied assembled with valvetrain hardware installed by Yella Terra.
- Yella Terra states the revised design flows more than 30% better than the original head and supports approximately 240 hp in suitable combinations.
Fitment: Confirm block family, bore, piston/chamber clearance, compression ratio, manifold, valvetrain geometry and cooling arrangement with the engine builder before assembly.
Supplier
Yella Terra
Product System
- Engine Parts
Supplier Part Number
ACHA 33C56
Built by Boost & Tune Support
BBT can assist with fitment review, installation, supporting modifications, configuration and calibration requirements where applicable.