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Description
GM LS2 LS6 Gen III Gen IV Genuine OEM Cylinder Head 799 Assembly with Valves and SpringsCondition: 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. Fitment information provided with best
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.
Fitment information provided with best effort, customer is ultimately responsible for fitment
Hollander Number 306-01749A
| Application | Year(s) | Engine / Notes |
|---|---|---|
| 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 | 04 |
Hollander Number 306-01749B
| Application | Year(s) | Engine / Notes |
|---|---|---|
| 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 hybrid 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 hybrid 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: 26.0000 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
4.3 ★★★★★
Based on 18 reviews
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Product Reviews
★★★★★ 5
Really soft and comfortable for the price!
Special Size: 27.5" Full Length, Size: Small, Color: Ocean Blue, Special Size: 27.5" Full Length, Size: Small, Color: Ocean Blue
These are soooo soft and the quality is amazing! They feel like they would be way more expensive! I love the color and get lots of complements.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on January 22, 2026
★★★★★ 5
Fabulous!
Special Size: 19" Capri with Pockets, Size: X-Small, Color: Flamingo Pink
These are AMAZING! Just received my first two pairs ( black and flamingo pink) and I am back ordering more! They are so smooth and soft and feel great! They fit so well-not to restrictive but have strength enough in the Lycra to look amazing (not the thin, flimsy, cheap tights/leggings). I live in the Sunshine State so I can wear these to workout and run indoor or outdoor practically year round. I prefer this shorter length because they are cooler to wear in the 95° heat 100% humidity. So hoping they make these in the green color and the bright blue color that is available in the full length active leggings! These are my new favorite crop active leggings! Please, please, please make more colors! Amazon, these are fabulous quality and style and at this price point, I'd buy every color and pattern available (I just don't do flesh tones).
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on July 8, 2025
★★★★★ 5
Super comfortable fabric and launders well.
Special Size: 19" Capri with Pockets, Size: Large, Color: Taupe
Super soft fabric with a nice high waist that does not seem to rolll down when exercising, Yeah!
As always I love a good cell phone pocke. After the comfortable fit I also ordered the Slate Blue version.
BTW, I have had 2 knee replacements so this below the knee length is a perfect solution for my vanity issues!.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on July 2, 2025
★★★★★ 4
Great product and quality!
Special Size: 19" Capri with Pockets, Size: Medium, Color: Slate Grey
I got the matching sports bra for these and I love the set together and honestly really liked the shorter leggings. The quality is incredible and super comfortable. For the amount I spent on this set it was absolutely worth it. The material is definitely thick enough so they are squat proof but they fit a little loose. I think I would size down one size if I bought another color in these. Overall great product!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on July 16, 2025
★★★★★ 5
THESE
Special Size: 19" Capri without Pockets, Size: X-Small, Color: Navy
I love these leggings! Purchased Navy seriously I have had a gazillion brands, styles types, ie. flare, etc. over my legging years of which there are many. These are the best so far. Perfect for ME. I am 112lbs. 5'1" so not 'normal human size' as my kids say. The small is perfect. Hits 'capri' length on my smaller frame a little longer for me so yay for that too. These are super good quality and I am picky about leggings. They are better than Costco WHAT? Yes they are. **NOTE: These do NOT have a phone pocket which I was also looking for. I am over phone pockets for now. These you could dress up for a night out. Buying every color. The price point is low-so were my expectations. But VOILA! These were a super surprise. Happiness is my Amazon delivery human.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 24, 2026
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