SU HD8 Triple Carburettor Set for Austin Healey 3000
This SU HD8 Triple Carburettor Set is designed for custom and performance applications on six-cylinder Austin Healey 3000 models. While HD8 carburettors were factory-fitted in twin form to later BJ8 models, a triple-HD8 configuration was never an original factory specification. This set is ideal for high-performance builds, historic motorsport, or period-style modifications requiring increased airflow.
Supplied with three brand-new SU HD8 carburettors, the assembly is precision-spaced and fully linked for installation on manifolds designed to accept three 2″ HD8 units. Built to SU specification, it offers robust construction and reliable fuelling when correctly tuned.
Benefits
- Triple-carburettor configuration using brand-new 2″ SU HD8 units
- Pre-assembled with correct spacing and linkages for easy installation
- Provides increased airflow for tuned and high-compression engines
- Suitable for custom, competition, or high-performance road use
- No fabrication required when used with a compatible triple-carb manifold
Compatibility & Fitment Guidance
This kit is intended for Austin Healey 3000 engines equipped with or adapted to use a triple-carburettor inlet manifold for 2″ HD8 units. Not a factory BJ8 specification — fitting requires the correct manifold, linkage, and bonnet clearance checks. Always verify
before ordering.
Why Fit This Assembly
HD8 carburettors deliver greater airflow than HS4, HS6, or HD6 units, making them a popular choice for engines built for higher power output. A triple-HD8 layout helps optimise mixture distribution across all six cylinders in demanding performance applications.
Technical Notes
- Type: SU HD8 side-draft carburettors (2″ bore)
- Set Includes: 3× brand-new carburettors, integrated linkages, correct spacers
- Supplied pre-aligned and ready for installation on compatible manifolds
Servicing & Maintenance
Each carburettor can be maintained using standard SU HD8 service kits. Regular checks of float levels, jets, and linkage play are recommended for tuned applications.
Note on Originality
This is an aftermarket performance assembly and was never a documented factory configuration. It is intended for experienced restorers, tuners, or owners building a custom triple-carburettor setup for competition or high-performance use.
Factory Carburettor Reference
Use the table below to confirm the original factory carburettor type for your Austin Healey 3000 variant.
Factory Carburettor Reference
| Model | Chassis Codes | Production Dates | Factory Carbs | Bore Size |
| MK I (3000) | BN7/BT7 | Mar 1959 - May 1961 | Twin SU | HD6 1¾″ |
| MK II (3000) - Tri-carb | BN7/BT7 | Late May 1961 - Mar 1962 (BN7)
Jun 1962 (BT7) | Triple SU | HS4 1½″ |
| MK II (3000) - BJ7 | BJ7 | Aug 1962 - Oct 1963 | Twin SU | HS6 1¾″ |
| MK II (3000) | BJ8 | Oct 1963 - 1967 | Twin SU | HD8 2″ |
FAQ
Will this fit my Austin Healey 3000 BJ8?
This set can be fitted to BJ8 models only if you have or install a triple-port inlet manifold for 2″ HD8 carburettors. The factory BJ8 specification used twin HD8 units, so this is not a direct factory replacement.
Is this the same setup originally fitted at the factory?
No. Austin Healey 3000 BJ8 models were factory-fitted with twin HD8 carburettors. A triple-HD8 layout is an aftermarket performance configuration.
Do I need to modify anything to fit this?
Yes — you’ll need a compatible triple-port manifold, correct linkages, and to verify bonnet clearance. It will not fit on a standard twin-carb manifold.
What are the benefits of a triple-HD8 setup?
The larger 2″ HD8 carburettors allow more airflow, which can improve performance on tuned or high-compression engines. Triple units help balance fuel delivery across all six cylinders.
Are these carburettors reconditioned?
No - these are brand-new SU HD8 carburettors built to original SU specification.