Shipping Estimate
USA
- USA
- CAN
- USA
- CAN
Ships within 48 hours · Estimated delivery Jul 5 - Jul 10
Promo Codes Available:
For Your Every Summer RSVP, with Code: SUMMER15
Description
Set of 2 GM LS2 LS6 Gen III Gen IV Genuine OEM Cylinder Head 799 Assembly with Valves, Springs, and RockersCondition: USED REBUILDABLE CORE This Cylinder Head part number 12629058 is engineered for optimal engine performance in many V8 applications. Designed to enhance combustion cooling and overall power output it is widely used in vehicles such as light trucks and performance models. The part has demonstrated reliability in 5. 3L engines and its quality is supported by multiple technical sources and fitment records. Hollander Number 306 01749A
Condition: USED/REBUILDABLE COREThis Cylinder Head part number 12629058 is engineered for optimal engine performance in many V8 applications. Designed to enhance combustion cooling and overall power output it is widely used in vehicles such as light trucks and performance models. The part has demonstrated reliability in 5.3L engines and its quality is supported by multiple technical sources and fitment records. Hollander Number 306-01749A Application CAMARO 99-02 8-350 (5.7L) CORVETTE 99-00 CORVETTE 01-04 LS1 engine (VIN G 8th digit) FIREBIRD 99-02 5.7L GTO 04Hollander Number 306-01749B Application ALLURE 08-09 5.3L AVALANCHE 1500 07-10 5.3L AVALANCHE 1500 11-13 CANYON 09-12 5.3L COLORADO 09-12 5.3L CORVETTE 01-04 LS6 engine (VIN S 8th digit) CORVETTE 05 CORVETTE 06-07 6.0L CTS 04-05 5.7L (VIN S 8th digit 8-350) CTS 06-07 6.0L (VIN U 8th digit 8-364) ENVOY 05-09 5.3L (Denali) ENVOY XL 05-06 5.3L ENVOY XUV 05 5.3L ESCALADE 09-13 6.0L (Hybrid) EXPRESS 1500 VAN 08-14 8-323 (5.3L) EXPRESS 2500 VAN 08-12 8-323 (5.3L) EXPRESS 2500 VAN 08-16 8-292 (4.8L) EXPRESS 2500 VAN 17 4.8L EXPRESS 3500 VAN 08-16 8-292 (4.8L) EXPRESS 3500 VAN 17 4.8L GRAND PRIX 05-08 5.3L GTO 05-06 HUMMER H3 08-10 5.3L IMPALA 06-09 5.3L ISUZU ASCENDER 05-06 5.3L LACROSSE 08-09 5.3L MONTE CARLO 06-07 5.3L RAINIER 05-07 5.3L SAAB 9-7X 05-09 8 cylinder SAVANA 1500 VAN 08-14 8-323 (5.3L) SAVANA 2500 VAN 08-12 8-323 (5.3L) SAVANA 2500 VAN 08-16 8-292 (4.8L) SAVANA 2500 VAN 17 4.8L SAVANA 3500 VAN 08-16 8-292 (4.8L) SAVANA 3500 VAN 17 4.8L SIERRA 1500 PICKUP 05-06 5.3L VIN B (8th digit opt L33) SIERRA 1500 PICKUP 07 classic style (creased door skin) 5.3L VIN B (8th digit opt L33) SIERRA 1500 PICKUP 07 style (smooth door skin) 4.8L SIERRA 1500 PICKUP 07 style (smooth door skin) 5.3L SIERRA 1500 PICKUP 08-10 5.3L SIERRA 1500 PICKUP 08-13 4.8L SIERRA 1500 PICKUP 09 6.0L whybrid option (opt HP2) SIERRA 1500 PICKUP 10-13 6.0L SIERRA 1500 PICKUP 11-13 5.3L gasoline SILVERADO 1500 PICKUP 05-06 5.3L VIN B (8th digit opt L33) SILVERADO 1500 PICKUP 07 classic style (creased door skin) 5.3L VIN B (8th digit opt L33) SILVERADO 1500 PICKUP 07 style (smooth door skin) 4.8L SILVERADO 1500 PICKUP 07 style (smooth door skin) 5.3L SILVERADO 1500 PICKUP 08-10 5.3L SILVERADO 1500 PICKUP 08-13 4.8L SILVERADO 1500 PICKUP 09 6.0L whybrid option (opt HP2) SILVERADO 1500 PICKUP 10-13 6.0L SILVERADO 1500 PICKUP 11-13 5.3L gasoline SSR 05-06 SUBURBAN 1500 07-09 8-323 (5.3L) SUBURBAN 1500 10-14 (5.3L) TAHOE 07 TAHOE 08-09 4.8L TAHOE 08-09 5.3L TAHOE 08-09 6.0L TAHOE 10-14 TRAILBLAZER 06-08 5.3L TRAILBLAZER 06-09 6.0L TRAILBLAZER EXT 05-06 5.3L YUKON 07-09 4.8L YUKON 07-14 5.3L YUKON 08-13 6.0L YUKON XL 1500 07-14 5.3L
Part Number: 12629058
Manufacturer: GM
Weight: 54.0000 lbs
Additional Details:
Genuine OEM Parts
Please research/ensure fitment of part to your specific vehicle before purchasing. Returns because of non-fitment are accepted with a re-stocking fee, however customer is responsible for return shipping.
Shipping:
If shipping outside the contiguous 48 states is required, reach out to [email protected] to confirm shipping details.
About Us:
Custard Core Supply provides the highest quality of new, new take off, used, and core parts. We provide a variety of gas and diesel parts to our customers. Based in Dallas, TX Custard Core Supply has been in business since 1998. If you do not see a product you are looking for on our page, please reach out!
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
4.6 ★★★★★
Based on 2110 reviews
Sort
Product Reviews
★★★★★ 5
Effective Relief for Dry Mout
Flavor Name: Mint, Size: 230 Count (Pack of 1)
Oracoat XyliMelts have been a lifesaver in managing my dry mouth symptoms, especially at night due to medication side effects.
Ease of Use: These discs are simple to use; I place two in my mouth before going to bed, and they adhere comfortably throughout the night. They’re discreet and easy to apply, making them convenient for both nighttime and daytime relief.
Effectiveness: XyliMelts work effectively to stimulate saliva production, providing much-needed moisture to alleviate the discomfort of dry mouth. I wake up with less dryness, which greatly improves my comfort and oral health.
Flavor and Comfort: The mild flavor is pleasant and doesn’t interfere with sleep. The discs dissolve slowly, ensuring consistent relief without any irritation.
Overall Experience: Oracoat XyliMelts are a must-have for anyone dealing with dry mouth from medications. They offer reliable, long-lasting relief and have become an essential part of my nightly routine.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on December 18, 2025
★★★★★ 5
A Tooth Saver
Flavor Name: Mint, Size: 230 Count (Pack of 1)
Work well. My mouth gets dry due to meds and this helps me avoid cavities while sleeping. It has a mild minty taste ad lasts most of the night. I sometimes use it during the day as well and it is nice and discreet.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 7, 2026
★★★★★ 5
Best relief for dry mouth!
Flavor Name: Mint, Size: 230 Count (Pack of 1)
My neurologist recommended XyliMelts after I mentioned dry mouth with CPAP use.
I have been using them for about a year and they’ve made a huge difference. Before using them, I would wake up several times with a completely dry mouth and throat. These help keep my mouth moist for hours while I sleep.
They stick well to the roof of my mouth without being uncomfortable, and the mild mint flavor isn’t overpowering. I also like that they dissolve slowly instead of disappearing too quickly like regular lozenges.
The only small adjustment was getting used to placing them the first couple of nights, but after that they were easy to use.
Overall, I’d definitely recommend these to anyone dealing with nighttime dry mouth or dry mouth from medications.
Pro tip: bring them with you when you travel, they are super helpful in drier climates and on planes.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 7, 2026
★★★★★ 4
Works well but too expensive
Flavor Name: Mint, Size: 230 Count (Pack of 1)
We love these for nightime. Wish they didn’t stop making the cinnamon, but we like the mint anyway. Excellent for dry mouth esp at night! Too expensive though.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 25, 2026
★★★★★ 5
Great product does what it says
Flavor Name: Mint, Size: 395 Count (Pack of 1)
Love these they work so well for dry mouth.
Side effects it does cause the skin in my mouth to kinda wrinkle and loosen?? Not sure why taste is semi sweet and minty which keeps my breath fresh and clean all night
Great value for money. Dosage and ingredients on the back.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 21, 2026