Special Order Item
Crank Pulley Ring
2009-2015 LSA Applications, 2016 & Newer LT4 Applications with Innovators West Balancer
These are the individual crank pulley rings used with our Interchangeable Crank Pulley Kit for the GM LSA and LT4 engine. If you have our kit installed on your car, you can buy the rings separately for a quick and easy change to the boost level.
These crank pulley rings are precision-machined from billet aluminum on a CNC lathe to ensure exacting dimensions, no runout, and the proper groove shape for maximum belt engagement. Each ring is black-anodized for long-lasting good looks and to provide the optimum surface for the ribbed side of the belt. The ring dimensions shown are effective diameters, as measured from belt-surface to belt-surface. These measurements do not include the flanges of the pulley.
In LT4 (CTS-V and ZL1) applications, pulley rings as large as 10.0" can be used without changing or relocating idler pulleys on the blower drive. For LSA applications, no idler pulley changes are necessary when using the 8.60" & 9.10" pulley rings. When using a 9.55" or larger ring in an LSA application, the crank idler pulley must be re-positioned for clearance. Metco manufactures a billet pulley mounting bracket under PN MRB1000, which installs as a direct replacement for the original bracket, but optimizes the position of both the crank idler pulley and supercharger idler pulley. This bracket can be used with the OEM idlers or our billet supercharger idler pulley, which offers durability, functional, and cosmetic upgrade. The supercharger idler pulley is available under PN MIP-100V. This item is listed elsewhere in this section.
Note: The original crank pulley in LSA & LT4 applications is approximately 8.0" in diameter. A pulley ring in this size is not available to fit the Innovators West balancer assembly, as this size pulley ring will not clear the case of the balancer.
The 8.60", 9.10", 9.55", and 10.0" pulley rings can be used on the 2016 & later LT4 applications using the appropriate Innovators West balancer, PN 8410. In select LT4 ZL1 applications, rings sized 9.55" and larger may interfere with the front sway bar.
Each ring size will require the appropriate supercharger belt. If you have questions regarding belt size, please call or email (email@example.com) for assistance.
Note: These crank rings can also be purchased in a 10-rib configuration for custom applications. Please call or email for details on availability and pricing.
2016 & Newer ZL1 & CTS-V LT4 Applications
An original-length belt can be retained with the installation of a 2.30" supercharger pulley.
With the 8.60" crank pulley kit: No Info
With the 9.10" crank pulley kit: Gates K080842HD
With the 9.55" crank pulley kit: Gates K080850HD
With the 10.0" crank pulley kit: Gates K080865HD
With the 10.5" crank pulley kit: No Info