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Description
Holley Cast Aluminum Timing Chain Cover - 21-151Overview: 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
Overview:
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
Features:
- 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
Application:
| Year | Make | Model | Submodel | Engine Size |
|---|---|---|---|---|
| 1985 - 1986 | Chevrolet | C10 | 262/4.3L V6 | |
| 1985 - 1986 | Chevrolet | C20 | 262/4.3L V6 | |
| 1985 - 1986 | Chevrolet | G10 | 262/4.3L V6 | |
| 1985 - 1986 | Chevrolet | G20 | 262/4.3L V6 | |
| 1985 - 1986 | Chevrolet | G30 | 262/4.3L V6 | |
| 1985 - 1986 | Chevrolet | K10 | 262/4.3L V6 | |
| 1985 - 1986 | GMC | C1500 | 262/4.3L V6 | |
| 1985 - 1986 | GMC | C2500 | 262/4.3L V6 | |
| 1985 - 1986 | GMC | G1500 | 262/4.3L V6 | |
| 1985 - 1986 | GMC | G2500 | 262/4.3L V6 | |
| 1985 - 1986 | GMC | G3500 | 262/4.3L V6 | |
| 1985 - 1986 | GMC | K1500 | 262/4.3L V6 | |
| 1985 | Chevrolet | Astro | 262/4.3L V6 | |
| 1985 | Chevrolet | K20 | 262/4.3L V6 | |
| 1985 | GMC | K2500 | 262/4.3L V6 | |
| 1985 | GMC | Safari | 262/4.3L V6 |
Specs:
| Application | Small Block Chevy |
|---|---|
| Brand | Holley |
| Crank Sensor Provision | No |
| Emission Code | 5 |
| Engine | Chevrolet VORTEC V8 |
| Finish | Black |
| Gaskets Included | Yes |
| Material | Aluminum |
| Mounting Hardware Included | Yes |
| Product Type | Timing Chain Cover |
| Thickness | Standard OEM |
| Warranty | Limited 90 Day |
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- Free Standard Shipping on $100+ Orders to the USA.
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4.4 ★★★★★
Based on 24 reviews
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Product Reviews
★★★★★ 5
an excellent reference book
Format: Hardcover
At a time when the U.S. and Israel’s military operation against Iran has become one of the most important issues on the global agenda, this is an excellent reference book that summarizes the historical development of events and provides valuable context for better understanding what is happening today.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 11, 2026
★★★★★ 5
Great for better understanding Iran's strategic perspectives
Format: Hardcover
The book moves through the growth of Iran's strategic history since the 1979 revolution. By the time it gets to the last 100 pages its very interesting as far as understanding Iran's perspective. Also found it chilling how foreboding many parts were in light of what is happening right now
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on March 2, 2026
★★★★★ 5
Great book to understand Iran's strategy in a historical context
Nasr provides a solid understanding of Iran both in contemporary and historical context. It makes the case clear what and how Iran is thinking. Reading it at the time of Us-Israel and Iran war helped make sense of the news media, which often follows shallow analysis.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on March 27, 2026
★★★★★ 5
Iran’s Strategic Error.
Format: Audiobook
Excellent discussion of Iran’s grand strategy in what they believe will protect their Nation as they continue as the world’s pariah. The book is well written and clearly lays out the history of Iran over the past 50-60 years and why they are implementing this strategy albeit a failed one, and the results. The Ayatollahs continue to pursue the destruction of Israel and struggle via terrorism and supporting war proxies to become the regions power, instead of pursuing economic wealth. This book describes the how’s and whys of this failed strategy. Good reading
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Reviewed in the United States on November 15, 2025
★★★★★ 5
Highly Recommend
Format: Hardcover
A must read, especially during the current circumstances, for anyone wanting to have a better understanding of the nuanced Iranian political strategy. This book not only clarifies how the current government of Iran thinks and operates but also why it does what it does. Contrary to the western narrow and wrongheaded perception of the Iranian regime as an fanatical religious theocracy, the book lays bare different approches the Iranian government takes to different problems and shows how many of those decisions are not based on religious convictions. Decisions are made for pragmatic and historical reasons and until the Western governments understand what the issues are, they will not be able to find a path forward that does not include violence, war, and mass casualties.
During these times that you have ignorant American Senators that push for war on behalf of a foreign government and don't know the most basic facts about Iran, I wish every American and European politician would read this book before uttering another word.
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Reviewed in the United States on June 21, 2025
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