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Holley Cast Aluminum Timing Chain Cover

Vortec/Small Block Chevy Cast Aluminum Timing Chain Cover w/Crank Sensor provision - Black Finish

PART# 21-153

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$84.08   Suggested Retail
$75.67   Your Price
Estimated shipping date: 03/30/2021
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Holley now offers a solution to the plastic OEM timing chain covers on 1996-up Vortec Small Block Chevy engines. Our cast aluminum timing chain covers are an excellent upgrade from the OEM part, offering the superior durability of an aluminum part with improved functionality. These cast aluminum covers feature timing indicators molded into the body and are available with or without a crank sensor provision to accommodate both carbureted and EFI applications. The covers are available in two finishes; Natural Cast and Satin Black. They are packaged with a high quality gasket and E-coated mounting hardware for added corrosion resistance


  • Designed as an upgrade from the plastic OEM timing chain covers on 1996-up Vortec Small Block Chevy engines - Replaces GM part numbers 10244600, 12523972, 12523973, 12558343, 12562818, & 93800970
  • Excellent upgrade for Chevrolet Performance crate engines that use the plastic timing chain cover
  • Available for EFI (with crank sensor provisions) and carbureted applications (without crank sensor provision)
  • Includes over-molded FKM oil seal, virtually eliminating concerns of the seal spinning out at high temperatures, which is common with other aluminum timing covers
  • Timing indicator cast into the cover – Intended for use with 8” Vortec balancers and other popular 8” aftermarket balancers
  • Accommodates both stock and aftermarket water pumps
  • Includes high quality gasket, corrosion resistant E-coated hardware, and dowel pins
  • Offered in Natural Cast and Satin Black finishes


ApplicationSmall Block Chevy
Crank Sensor ProvisionYes
Emission Code5
EngineChevrolet VORTEC V8
Gaskets IncludedYes
Mounting Hardware IncludedYes
Product TypeTiming Chain Cover
ThicknessStandard OEM
WarrantyLimited 90 Day
Part Number21-153



This part is legal for sale or use on Emissions Controlled Vehicles, Uncontrolled (Non-Emissions Controlled) Vehicles, and Racing Use Only Vehicles because it does not affect vehicle emissions and is not covered by emissions regulations.

Tech Resources

- Fits both Small Block Chevy (SBC) & VORTEC series Small Block Chevy applications

- Mounting holes at the 10 o'clock and 2 o'clock positions are NOT used on VORTEC series engine fitments

- Supplied Dowel pins are used on VORTEC series engines fitments ONLY, early Small Block Chevy (SBC) have dowel pins installed in the block and will not be used.

Warranty Information

Limited 90 Day: See Details
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