ECS Belt and Pulley Size Guide ECS Novi 1500 and 2200 Kits
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ECS Belt and Pulley Size Guide Belt Drive Type: Standard= Complete Serpentine Belt DD= Direct Drive Short Belt ECS Novi 1500 and 2200 Kits C5 6-Rib 8-Rib 10-Rib HU Pulley/Balancer 3.80"/Standard 25-060895 25-080893 N/A 3.80"/Standard-DD 25-060535 25-080530 25-100554 3.80"/10% Overdrive 25-060915 25-080903 N/A 3.80"/10% Overdrive-DD 25-060544 25-080550 25-100563 3.60"/Standard 25-060891 25-080893 N/A 3.60"/Standard-DD 25-060529 25-080530 25-100554 3.60"/10% Overdrive 25-060895 25-080907 N/A 3.60"/10% Overdrive-DD 25-060535 25-080550 25-100563 3.47"/Standard 25-060888 25-080893 N/A 3.47"/Standard-DD 25-060529 25-080530 25-100540 3.47"/10% Overdrive 25-060895 25-080903 N/A 3.47"/10%Overdrive-DD 25-060535 25-080545 25-100554 3.33"/Standard 25-060888 25-080893 N/A 3.33"/Standard-DD 25-060529 28-080530 25-100535 3.33"/10% Overdrive 25-060891 25-080897 N/A 3.33"/10% Overdrive-DD 25-060535 25-080537/25-080545 25-100540 3.25"/Standard 25-060883 25-080893 N/A 3.25"/Standard-DD 25-060525 25-080530 WND-90835 3.25"/10% Overdrive 25-060891 25-080893 N/A 3.25"/10% Overdrive-DD 25-060535 25-080537 25-100540 3.00"-2.95"/Standard N/A 25-080893 N/A 3.00"-2.95"/Standard-DD N/A 25-080510 25-100510 3.00"-2.95"/10% Overdrive N/A 25-080893 N/A 3.00"-2.95"/10% Overdrive-DD N/A 25-080525 WND-90835 2.75"/Standard N/A 25-080872 N/A 2.75"/Standard-DD N/A 25-080507 25-100510 2.75"/10% Overdrive N/A 25-080872 N/A 2.75"/10% Overdrive-DD N/A 25-080510 WND-90835 2.75"/15% Overdrive-DD N/A 25-080537 25-100535 C6 3.80"/Standard 25-060895 25-080893 N/A 3.80"/Standard-DD 25-060535 25-080530 25-100554 3.80"/10% Overdrive 25-060915 25-080903 N/A 3.80"/10% Overdrive-DD 25-060544 25-080550 25-100563 3.60"/Standard 25-060891 25-080893 N/A 3.60"/Standard-DD 25-060529 25-080530 25-100554 3.60"/10% Overdrive 25-060895 25-080907 N/A 3.60"/10% Overdrive-DD 25-060535 25-080537 25-100563 3.47"/Standard 25-060895 25-080897 N/A 3.47"/Standard-DD 25-060535 25-080530 25-100540 3.47"/10% Overdrive 25-060900 25-080903 N/A 3.47"/10%Overdrive-DD 25-060544 25-080537 25-100554 3.33"/Standard 25-060895 25-080897 N/A 3.33"/Standard-DD 25-060529 25-080525 25-100535 3.33"/10% Overdrive 25-060900 25-080897 N/A 3.33"/10% Overdrive-DD 25-060535 25-080525/25-080537 25-100540 3.25"/Standard 25-060891 25-080897 N/A 3.25"/Standard-DD 25-060529 25-080525 WND-90835 3.25"/10% Overdrive 25-060900 25-080897 N/A 3.25"/10% Overdrive-DD 25-060544 25-080537 25-100540 3.00"-2.95"/Standard N/A 25-080893 N/A 3.00"-2.95"/Standard-DD N/A 25-080510 25-100510 3.00"-2.95"/10% Overdrive N/A 25-080897 N/A 3.00"-2.95"/10% Overdrive-DD N/A 25-080525 WND-90835 2.75"/Standard N/A 25-080893 N/A 2.75"/Standard-DD N/A 25-080510 25-100510 2.75"/10% Overdrive N/A 25-080893 N/A 2.75"/10% Overdrive-DD N/A 25-080510 WND-90835 2.75"/15% Overdrive-DD N/A 25-080537 25-100535 C7 4.10"/ECS Hub N/A 25-080485 25-100485 3.70"/ECS Hub N/A 25-080485 25-100485 3.50"/ECS Hub N/A 25-080485 25-100485 3.00"/ECS Hub N/A 25-080471 25-100465 Camaro 3.47"/ECS Hub N/A 25-080720 25-100719 3.33"/ECS Hub N/A 25-080720 25-100719 2.95"/ECS Hub N/A 25-080716 25-100710 ECS Kit Accesory Belt '10-'12 25-060849 ECS Kit Accesory Belt '13+ E-Steer 25-060810 (Stock) ECS Kit Accesory Belt ATI '10-'12 25-060840 ECS Kit Accesory Belt ATI '13+ E-Steer 25-060802 ECS Kit A/C Belt ATI UD Balancer 25-040373-SF Cartek Flip Drive System Belts C5 A/C: 25-040490 C5 ALT: 25-060365 C6 A/C: 25-040470 or 25-040468 C6 ALT: 25-060365 Balancer Pulley Diameters C5/C6 Standard: 7.25" 10% Overdrive: 8.00" 15% Overdrive: 8.33" C7 Standard: 8.25 Overdrive: 8.33 Camaro ECS Camaro Balancer Pulley: 8.00" MAX BLOWER RPM LIMIT Blower Step Up Ratio Novi-1500SL: 52,000 3.61 Novi-2200SL: 52,000 3.61 Novi-2000 (Oil Fed): 55,000 3.54 Novi-2200HD (Oil Fed): 60,000 3.45 Novi-2200R (Oil Fed): 65,000 3.45 Novi-2200X (Oil Fed): 65,000 3.45 Blower Max RPM Formula SR: Step Up Ratio CP: Crank Pulley Eng RPM: Engine RPM HU: Head Unit Pulley SR x CP x Eng RPM/HU=Max Blower RPM Head Unit Pulley Machining Specs Machining Instructions C5 6-Rib .200" Spacer 8-Rib .075 Off Short Side 10-Rib No Change Short Side Down C6 6-Rib .200" Spacer 8-Rib .075"Off Short Side 10-Rib No Change Short Side Down C7 8-Rib ECS NO Change/PAX Add .085 10-Rib ECS NO Change Camaro 8-Rib Machined .250" Off Long Side 10-Rib Machined .250" Off Long Side Factory Belt Sizes Napa Part Numbers C5 Accesory 6-Rib 25-060802 A/C 4-Rib 25-040420 C6 Accesory 6-Rib 25-060798 A/C 4-Rib Wet Sump 25-040410 A/C 4-Rib Dry Sump 25-040418 C7 Accesory and A/C 6-Rib 25-060650 Camaro Accesory 6-Rib Standard Steering '10-'11 25-060854 Accesory 6-Rib Electronic Steering '12+ 25-060810 A/C 4-Rib 25-040373SF.