Yella Terra Chevrolet Holden LS 6-Bolt Heavy-Duty Billet Flexplate 168T (YT9927)
Yella Terra Chevrolet LSA LSX 8-Bolt Steel Flywheel 168T for LS1 Clutch (YT9918)
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Yella Terra YT9918 8-Bolt LSA/LSX Steel Flywheel
The Yella Terra YT9918 is an explosion-resistant billet steel flywheel for GM LSA and LSX V8 engines with an eight-bolt crankshaft flange. It provides a robust standard-weight flywheel solution for conversions that pair an eight-bolt LSA or LSX engine with an LS1-style gearbox and clutch.
The flywheel is neutral balanced, carries a 168-tooth ring gear and is drilled for the factory 11-inch LS1 clutch bolt pattern. The LS1 reference describes the clutch pattern and gearbox conversion arrangement; it does not mean the flywheel suits a six-bolt LS1 crankshaft.
Key features
- Billet steel, explosion-resistant construction
- Designed for LSA and LSX engines with an eight-bolt crankshaft
- Factory LS1 11-inch clutch bolt pattern
- Suitable for compatible LSA/LSX conversions using an LS1 gearbox
- Standard-weight design
- Neutral balance
- 168-tooth ring gear
- 358 mm outside diameter
- 11.2 kg product weight
Specifications
| Part number | YT9918 / YT9918L |
|---|---|
| Product type | Flywheel |
| Construction | Billet steel |
| Classification | Standard weight |
| Balance | Neutral (engine balance status 0) |
| Product weight | 11.2 kg |
| Ring gear teeth | 168 |
| Outside diameter | 358 mm |
| Engine type | LSX / LSA V8 |
| Engine capacity | 376–454 cu in |
| Crankshaft flange | 8-bolt |
| Clutch pattern | Factory LS1 |
| Clutch diameter | 11 inches |
| Crank spigot diameter | 2.0625 inches |
| Manufacturer torque setting | 85 ft-lb |
Important fitment information
This flywheel is specifically for compatible LSA and LSX engines with an eight-bolt crankshaft flange. It is not a replacement flywheel for a standard six-bolt LS1 crankshaft. Confirm crank-bolt count, clutch pattern, ring-gear size, starter compatibility and gearbox arrangement before ordering. Installation and final fastener torque should be completed by a suitably qualified technician.
| Product Name | Yella Terra Chevrolet LSA LSX 8-Bolt Steel Flywheel 168T for LS1 Clutch (YT9918) |
|---|---|
| Brands | Yella Terra |
| Engine | ChevLS, GM / LS |
| Make | Chevrolet, GM, Holden, LS Chev |
Delivery & Freight
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Which engines does the Yella Terra YT9918 flywheel suit?
It is designed for compatible GM LSA and LSX V8 engines with an eight-bolt crankshaft flange, covering Yella Terra's stated 376–454 cu in application range.
Does YT9918 fit a standard six-bolt LS1 crankshaft?
No. YT9918 is an eight-bolt crankshaft flywheel. The LS1 reference applies to the factory clutch bolt pattern and compatible gearbox conversion arrangement, not the crankshaft flange.
Which clutch pattern is drilled into the YT9918?
It is drilled for the factory 11-inch LS1 clutch bolt pattern.
Is the YT9918 neutral balanced?
Yes. Yella Terra specifies neutral balance, engine balance status 0 and a standard-weight design.
What are the main YT9918 specifications?
The billet steel flywheel weighs 11.2 kg, has 168 ring-gear teeth, a 358 mm outside diameter and a 2.0625-inch crank spigot diameter.
