Overview
The HPI Racing Underhead (F4.6) is a genuine HPI replacement underhead for the Nitro Star F4.6 engine. It's the inner head section that sits under the cooling head.
Replace a worn or damaged underhead during a rebuild to get your F4.6 back to factory spec.
Key Features
- Genuine HPI Racing engine part
- Made for the Nitro Star F4.6 engine
- Direct OEM replacement
- Used with the upper cooling head
Performance Benefits
- Restores factory head fit
- Helps the engine run consistently after a rebuild
- Cheaper than a complete head assembly
Usage Notes
- Replace cylinder gaskets (e.g. #1460) when reassembling
- Tighten head screws evenly in a cross pattern
- Clean the engine exterior before disassembly to keep dirt out of the internals
Technical Specs
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Brand: HPI Racing
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Item No.: 1447
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Engine: Nitro Star F4.6
What's Included
- (1) HPI Racing underhead (F4.6)
Fitment
Compatible RC vehicles: HPI Nitro Star F4.6 Engine, HPI Savage X.
Summary
- Replacement underhead for the Nitro Star F4.6
- Genuine HPI engine part
- Restores factory head fit
