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Description
Holley Cast Aluminum Timing Chain Cover w/Crank Sensor Port 21-152Overview: 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, see Part Number 21-150)
- 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
- Natural Cast Finish (For Satin Black Finish see Part Number 21-153)
Fitment Notes:
- 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.
- This Timing Chain cover INCLUDES the Crank Sensor Port Provision, for models WITHOUT the CKP Provision see Part Number 21-150
- Does NOT work with Double Roller Timing Chain or Non-Roller Cam!
- Only for GAS Engines! Not for use with Bi-Fuel or CNG Applications!
Applications:
| Year | Make | Model | Engine | Fitment Notes |
|---|---|---|---|---|
| 1999-2000 | Cadillac | Escalade | 5.7L V8 350 CID | With Crank Sensor Port Provision |
| 1996-2000 | Chevrolet | C35 (Mexico Only!) | 5.7L V8 350 CID | With Crank Sensor Port Provision |
| 1996-1999 | Chevrolet | C1500 | 5.0L V8 305 CID | With Crank Sensor Port Provision |
| 1996-1999 | Chevrolet | C1500 | 5.7L V8 350 CID | With Crank Sensor Port Provision |
| 1996-1999 | Chevrolet | C1500 Suburban | 5.7L V8 350 CID | With Crank Sensor Port Provision |
| 1996-1998 | Chevrolet | C2500 | 5.0L V8 305 CID | With Crank Sensor Port Provision |
| 1996-2000 | Chevrolet | C2500 | 5.7L V8 350 CID | With Crank Sensor Port Provision |
| 1996-1999 | Chevrolet | C2500 Suburban | 5.7L V8 350 CID | With Crank Sensor Port Provision |
| 1996-2000 | Chevrolet | C3500 | 5.7L V8 350 CID | With Crank Sensor Port Provision |
| 1996-2002 | Chevrolet | Express 1500 | 5.0L V8 305 CID | With Crank Sensor Port Provision |
| 1996-2002 | Chevrolet | Express 1500 | 5.7L V8 350 CID | With Crank Sensor Port Provision |
| 1996-2002 | Chevrolet | Express 2500 | 5.0L V8 305 CID | With Crank Sensor Port Provision |
| 1996-2002 | Chevrolet | Express 2500 | 5.7L V8 350 CID | With Crank Sensor Port Provision |
| 1996-2002 | Chevrolet | Express 3500 | 5.7L V8 350 CID | With Crank Sensor Port Provision |
| 1996 | Chevrolet | G30 | 5.7L V8 350 CID | With Crank Sensor Port Provision |
| 1996-1999 | Chevrolet | K1500 | 5.0L V8 305 CID | With Crank Sensor Port Provision |
| 1996-1999 | Chevrolet | K1500 | 5.7L V8 350 CID | With Crank Sensor Port Provision |
| 1996-1999 | Chevrolet | K1500 Suburban | 5.7L V8 350 CID | With Crank Sensor Port Provision |
| 1996 | Chevrolet | K2500 | 5.0L V8 305 CID | With Crank Sensor Port Provision |
| 1996-2000 | Chevrolet | K2500 | 5.7L V8 350 CID | With Crank Sensor Port Provision |
| 1996-1999 | Chevrolet | K2500 Suburban | 5.7L V8 350 CID | With Crank Sensor Port Provision |
| 1996-2000 | Chevrolet | K3500 | 5.7L V8 350 CID | With Crank Sensor Port Provision |
| 1996-1999 | Chevrolet | P30 | 5.7L V8 350 CID | With Crank Sensor Port Provision |
| 1996-1999 | Chevrolet | Tahoe | 5.7L V8 350 CID | With Crank Sensor Port Provision |
| 2000 | Chevrolet | Tahoe Limited | 5.7L V8 350 CID | With Crank Sensor Port Provision |
| 2000 | Chevrolet | Tahoe Z71 | 5.7L V8 350 CID | With Crank Sensor Port Provision |
| 1996-2003 | Chevrolet | W3500 Tiltmaster | 5.7L V8 350 CID | With Crank Sensor Port Provision |
| 1996-2003 | Chevrolet | W4500 Tiltmaster | 5.7L V8 350 CID | With Crank Sensor Port Provision |
| 1996-1999 | GMC | C1500 | 5.0L V8 305 CID | With Crank Sensor Port Provision |
| 1996-1999 | GMC | C1500 | 5.7L V8 350 CID | With Crank Sensor Port Provision |
| 1996-1999 | GMC | C1500 Suburban | 5.7L V8 350 CID | With Crank Sensor Port Provision |
| 1996-1998 | GMC | C2500 | 5.0L V8 305 CID | With Crank Sensor Port Provision |
| 1996-2000 | GMC | C2500 | 5.7L V8 350 CID | With Crank Sensor Port Provision |
| 1996-1999 | GMC | C2500 Suburban | 5.7L V8 350 CID | With Crank Sensor Port Provision |
| 1996-2000 | GMC | C3500 | 5.7L V8 350 CID | With Crank Sensor Port Provision |
| 1996 | GMC | G3500 | 5.7L V8 350 CID | With Crank Sensor Port Provision |
| 1996-1999 | GMC | K1500 | 5.0L V8 305 CID | With Crank Sensor Port Provision |
| 1996-1999 | GMC | K1500 | 5.7L V8 350 CID | With Crank Sensor Port Provision |
| 1996-1999 | GMC | K1500 Suburban | 5.7L V8 350 CID | With Crank Sensor Port Provision |
| 1996-2000 | GMC | K2500 | 5.7L V8 350 CID | With Crank Sensor Port Provision |
| 1996-1999 | GMC | K2500 Suburban | 5.7L V8 350 CID | With Crank Sensor Port Provision |
| 1996-2000 | GMC | K3500 | 5.7L V8 350 CID | With Crank Sensor Port Provision |
| 1996-1999 | GMC | P3500 | 5.7L V8 350 CID | With Crank Sensor Port Provision |
| 1996-2002 | GMC | Savana 1500 | 5.0L V8 305 CID | With Crank Sensor Port Provision |
| 1996-2002 | GMC | Savana 1500 | 5.7L V8 350 CID | With Crank Sensor Port Provision |
| 1996-2002 | GMC | Savana 2500 | 5.0L V8 305 CID | With Crank Sensor Port Provision |
| 1996-2002 | GMC | Savana 2500 | 5.7L V8 350 CID | With Crank Sensor Port Provision |
| 1996-2002 | GMC | Savana 3500 | 5.7L V8 350 CID | With Crank Sensor Port Provision |
| 1996-2003 | GMC | W3500 Forward | 5.7L V8 350 CID | With Crank Sensor Port Provision |
| 1998-2003 | GMC | W4500 Forward | 5.7L V8 350 CID | With Crank Sensor Port Provision |
| 1996-1999 | GMC | Yukon | 5.7L V8 350 CID | With Crank Sensor Port Provision |
| 2000 | GMC | Yukon Denali | 5.7L V8 350 CID | With Crank Sensor Port Provision |
| 1996-2003 | Isuzu | NPR | 5.7L V8 350 CID | With Crank Sensor Port Provision |
| 1998-2003 | Isuzu | NPR-HD | 5.7L V8 350 CID | With Crank Sensor Port Provision |
| 2002-2004 | Workhorse | FasTrack FT1061 | 5.7L V8 350 CID | With Crank Sensor Port Provision |
| 2000-2001 | Workhorse | FasTrack FT1260 | 5.7L V8 350 CID | With Crank Sensor Port Provision |
| 2002-2005 | Workhorse | FasTrack FT1261 | 5.7L V8 350 CID | With Crank Sensor Port Provision |
| 2000-2002 | Workhorse | FasTrack FT1460 | 5.7L V8 350 CID | With Crank Sensor Port Provision |
| 2002-2005 | Workhorse | FasTrack FT1461 | 5.7L V8 350 CID | With Crank Sensor Port Provision |
| 2000-2001 | Workhorse | FasTrack FT1600 | 5.7L V8 350 CID | With Crank Sensor Port Provision |
| 2002-2005 | Workhorse | FasTrack FT1601 | 5.7L V8 350 CID | With Crank Sensor Port Provision |
| 2000-2001 | Workhorse | FasTrack FT1800 | 5.7L V8 350 CID | With Crank Sensor Port Provision |
| 2002-2004 | Workhorse | FasTrack FT1801 | 5.7L V8 350 CID | With Crank Sensor Port Provision |
| 2002-2003 | Workhorse | FasTrack FT1802 | 5.7L V8 350 CID | With Crank Sensor Port Provision |
| 2000-2005 | Workhorse | P30 | 5.7L V8 350 CID | With Crank Sensor Port Provision |
| 2001-2002 | Workhorse | P32 | 5.7L V8 350 CID | With Crank Sensor Port Provision |
| 1999-2004 | Workhorse Custom Chassis | P42 | 5.7L V8 350 CID | With Crank Sensor Port Provision |
Specs:
| Application | Small Block Chevy |
|---|---|
| Brand | Holley |
| Crank Sensor Provision | Yes |
| Emission Code | 5 |
| Engine | Chevrolet VORTEC V8 |
| Finish | Natural |
| Gaskets Included | Yes |
| Material | Aluminum |
| Mounting Hardware Included | Yes |
| Product Type | Timing Chain Cover |
| Thickness | Standard OEM |
| Warranty | Limited 90 Day |
Interchange:
| Reference Name | Reference Number |
| OEM | 10244600 |
| OEM | 12523972 |
| OEM | 12523973 |
| OEM | 12558343 |
| OEM | 12562818 |
| OEM | 93800970 |
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
4.9 ★★★★★
Based on 1382 reviews
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Product Reviews
★★★★★ 3
Weird smell
Color: White-cooling Basic, Size: Queen(Pack of 2)
The pillows are great for someone looking for something cool and comfortable. We loved them so much that we bought a second pair. However, we were seriously disappointed with the odor of our last purchase. They give off a strong and indescribable chemical/burning plastic smell so nauseating that it’s difficult to sleep with. We’re hoping this issue will resolve with a couple more washes of the pillow cases, but am worried the source is the stuffing itself.
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Reviewed in the United States on May 28, 2026
★★★★★ 5
helped treat my sore neck
Color: White-cooling Basic, Size: Camping Pillow(Pack of 1)
This pillow — after dialing in the right amount of shredded foam — has greatly helped my sore neck. Initially, I had to remove some foam. Then I gradually added foam until it reached optimum comfort and support.
It is also CPAP-friendly — especially when I position my head near the pillow's edge. (I am a left-side sleeper.)
I like the travel size because I use a bulky hugging pillow to ease stress on my shoulder and elbow. That makes my side of the bed feel cramped if using a larger head pillow. A smaller pillow is easy to flip end-to-end in the middle of the night.
I have spent lots of money on pillows over the years, but this is the best I've ever had for relieving [1] neck pain and [2] CPAP mask seal problems. Very comfortable, supportive, and affordable.
I did not notice any unpleasant smell — and I am usually sensitive to that kind of thing.
Would highly recommend.
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Reviewed in the United States on May 7, 2026
★★★★★ 5
Love them!
Color: White-cooling Basic, Size: Queen(Pack of 2)
Love them! After 10 years with our MyPillows, they finally lost their fluff. The reviews I read of the MyPillows of today were not good; they didn’t have as much filling as they used to. These pillows remind me of how fluffy our new MyPillows were 10 years ago!! You sink right into them and can mush them however and they stay. These are way cheaper than the Coop and it’s the same concept; add or remove the filling as needed. The cooling side is a huge plus too! You won’t be disappointed with these pillows!
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Reviewed in the United States on May 22, 2026
★★★★★ 5
super smooth, silky, stays comfortable feeling. DO NOT DRY or wash with heat
Color: Blue, Size: Queen (U.S. Standard), Set name: Stretchy and Soft, Color: Blue, Size: Queen (U.S. Standard), Set name: Stretchy and Soft
I'm impressed. I have used cooling pillow cases before, and found them effective, but the cooling material have always been on just one side. These are 100% cooling material. The material is super smooth and silky feeling. It is great feeling against hair and skin (even better than my old polyester satin I was using before cooling pillowcases). The material is cool, and does not seem to get hot hot. The pillow cases are super stretchy with a small hidden zipper. They grab onto the pillow and dont loosen up. Makes my pillow look neat and clean, not sloppy from loose material. I can even have two pillows stacked and somehow despite being a smooth material, the pillows dont just slide off each other.
The cooling aspect works by not trapping heat, not allowing heat to get to the pillow and hold it there. So yeh, the pillow case will feel warm eventually but if you have a fan, or AC, or flip the pillow, then it is is truly cool. Otherwise in my experience when I use a pillow without this, the pillow just gets hot, stays hot, and even with flipping it feels hot.. because the pillow itself has trapped the heat for remainder of night. Yuck.
One thing to know and this is very important-- as I learned the hard way-- DO NOT DRY IN DRYER. DO NOT WASH IN HOT WATER. Heat will destroy the material ability to feel and stay cool. Do you want a regular heat trapping pillow case? Then go ahead and dry these in the dryer a few times and you will have a regular pillow case. HOw do I know? I bought these to replace another set (different brand, same idea, same instructions that I failed to remember). I always dried them in the dryer, and one night after having gloriously cool pillows, I noticed that my pillow was HOT night after night. It was then when looking for another set of pillow cases that I learned that they cant be exposed to heat like that. SO PLEASE, just AIR DRY.
And so, after I got these and put them on my pillows, I had a much better nights rest. I remember thinking that I wasnt waking to rearrange my pillows. They were just comfortable all night long. Sure, I'd love an even colder pillow, but our room is on the warm side. But at least I wasnt noting the hot hot pillows anymore.
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Reviewed in the United States on June 6, 2021
★★★★★ 5
A must try for hot sleepers!
Color: Blue, Size: Queen (U.S. Standard), Set name: Silky, Color: Blue, Size: Queen (U.S. Standard), Set name: Silky
If you are a hot sleeper these pillowcases are for you! Not only are they silky and beautiful, but they are cool to the touch!The Arc-Chill fabric absorbs heat and instantly cools your skin! If you are prone to insomnia, night sweats, give these a try! They come in a 2 pack and have a few different colors to try out. Highly recommend.
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Reviewed in the United States on May 27, 2026