Holley's cast aluminum timing chain cover replaces the plastic OEM cover on 1996-up Vortec Small Block Chevy engines, offering the durability of aluminum with improved functionality. It features a molded-in timing indicator and is available with or without a crank sensor provision to suit both carbureted and EFI applications.
Specifications:
- Application: Small Block Chevy
- Engine: Chevrolet VORTEC V8
- Crank Sensor Provision: Yes
- Finish: Black
- Gaskets Included: Yes
- Material: Aluminum
- Thickness: Standard OEM
- Product Type: Timing Chain Cover
- Part Number: 21-153
Fits both Small Block Chevy (SBC) and Vortec-series SBC applications. Replaces GM part numbers 10244600, 12523972, 12523973, 12558343, 12562818, and 93800970. Mounting holes at the 10 and 2 o'clock positions are not used on Vortec-series fitments; supplied dowel pins are for Vortec-series fitments only (early SBC blocks already have dowel pins installed). Includes an over-molded FKM oil seal, corrosion-resistant E-coated hardware, and a high-quality gasket, and accommodates both stock and aftermarket water pumps.
FAQ
Does 21-153 include a crank sensor provision?
Yes — this version includes the crank sensor provision for EFI applications.
What GM part numbers does it replace?
10244600, 12523972, 12523973, 12558343, 12562818, and 93800970.
Are dowel pins and a gasket included?
Yes, along with corrosion-resistant E-coated mounting hardware. Dowel pins are for Vortec-series fitments only.
Will it work with an aftermarket water pump?
Yes, it accommodates both stock and aftermarket water pumps.
