Speedmaster®
Chevy GM LS 5.670" 25% Underdrive Harmonic Balancer Damper SFI 18.1
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Product Information
Overview
Speedmaster Harmonic dampers feature a bonding process which adheres the elastomer to the i.d. of the inertia ring and the o.d. of the hub, utilizing a strong adhesive along with an improved elastomer to create a much stronger bond. The inertia ring rotates harmonically with the engine and absorbs the torsion vibration from the rotating assembly at any frequency and RPM. It extends the life of crankshaft and bearing which allows the engine to produce more power and torque.
Specs
| Brand: | Speedmaster |
| Part Number: | PCE291.1081 |
| Part Type: | Harmonic Balancer |
| Engine Balance: | Internal |
| SFI Rating: | SFI 18.1 |
| Degree Markings: | Yes |
| Degree Marking Range: | 360 |
| Outside Diameter (in): | 5.670 in. |
| Harmonic Balancer Material: | Aluminum/Steel |
| Harmonic Balancer Construction: | Elastomer |
| Harmonic Balancer Finish: | Black |
| Mounting Hardware Included: | No |
| Quantity: | Sold individually. |
Warranty Information
12-Month Limited Worldwide Warranty
Prop 65 Warning
This product may contain chemicals known to the State of California to cause cancer, birth defects, or other reproductive harm.
Installation Guide
Our AI assistant generates a step-by-step guide for this product — covering installation, maintenance, and troubleshooting.
This AI-generated guide is for general reference only and does not constitute official Speedmaster product documentation. Always verify fitment, torque specifications, and safety requirements before installation.