9° Small Block Chevy Cylinder Heads

Imagine the raw power offered by exotic head designs coupled with the simplicity of an in-line valve design. The 9° cylinder head is the embodiment of this combination.

9° Small Block Chevy Cylinder Heads

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Overview

Optimal valve angle and intake port positioning achieve maximum potential air/fuel flow around the circumference of the valves, for ultimate power potential. A mirrored valve configuration has been used with inline valves, this allows for a more compact intake manifold, which in turn makes for easier tuning and better throttle response thanks to the even distribution between the runners.

The 4.400" bore space heads have 286cc intake ports, 4.500" heads have 296cc. Both versions are fully CNC ported and have 45cc chambers and 5/16" valve guides.

It is recommended that you contact a Dart technical representative before placing an order for this item. Detailed information about your planned engine build will help to ensure that you choose the right configuration for your motor and that any special parts and considerations are taken into account.

Features:
- Premium alloy: Dart aluminum heads are cast from virgin 355-T61 aerospace alloy for superior strength and integrity.

- Redesigned casting has been optimized for CNC porting.

- Improved intake port and valve design for excellent response and a broad power band.

- The valve seats for intake and exhaust valves have been cut at 50 degrees to increase air/fuel flow at high lift.

- The exhaust flange pattern for the standard 4.400" bore space head has been designed to work with widely available 13 degree exhaust headers.

- Copper beryllium seats are standard.

- The flange for the front valve cover mount has been made taller, allowing for shorter valve covers.

- Provisions for extra head bolts have been added to each end, making for an improved seal.

- Non standard exhaust and valve cover patterns.

- 9° heads sold bare, no assemblies available.

- All cylinder heads are sold individually.
 

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