These lower (crank) pulleys by DSX are compatible with ATI damper part numbers 918854 (LSA) and 918856 (LT4 wet sump only). They are machined from 6061 aluminum and anodized for protection.
The lower pulleys are available in the following diameters (% of overdrive is shown):
- 230mm (9.06") [LSA 15%/LT4 12%]
- 235mm (9.25") [LSA 18%/LT4 15%] IDLER RELO BRACKET REQUIRED FOR LSA
- 240mm (9.45") [LSA 20%/LT4 17%] IDLER RELO BRACKET REQUIRED FOR LSA
- 245mm (9.65") [LSA 23%/LT4 20%] IDLER RELO BRACKET REQUIRED FOR LSA
- 250mm (9.84") [LSA 25%/LT4 22%] IDLER RELO BRACKET REQUIRED FOR LSA
Note the 9.84" can interfere with the sway bar on extreme suspension geometry events in LT4 ZL1s/CTS-Vs.
Idler relocation bracket for LSA is required on factory drive systems only. Not applicable to all aftermarket ones. Check with aftermarket manufacturer if you are unsure.
OEM LSA diameter is 199.93mm (7.87").
OEM LT4 diameter is 204.97mm (8.07").