1. Cylinder Heads & Parts Engines Components For Sale
  2. sku: 11846466175580723
  3. CHEVROLET 1256853

CHEVROLET 1256853 Gm Cylinder Heads Rebuild 2.00/1.50 4.8 5.3 5.7

fits model: Ls1, Ls6. make: Chevrolet.

1256853 Chevrolet Gm 853 Cylinder Heads 2.00/1.50 Premium Rebuild Ls1 Ls6 4.8 5.3 5.7

( Manufacturer Part Number: 1256853 ), ( Valve Guides: New Oem Style Iron ), ( Valve Seals: Poly Intake / High Temp Poly Exhaust ), ( Custom Bundle: Yes ), ( Items Included: See Package ), ( Core Charge: Return Fore For Extended Warranty Only ), ( Build Package: 3 Angle Performance ), ( Manufacturer Warranty: 6 Month ), ( Finish: Aluminum ), ( Fitment Type: Direct Replacement ), ( Vintage Part: No ), ( Bore Size: 3.890 ), ( Type: Cylinder Head ), ( Spring Seats: Tophat Style ), ( Oe/oem Part Number: 12561706 ), ( Exhaust Valves: Oem 1.5 ), ( Retainers: Oem Steel Retainers ), ( Compression Mill: .010 ), ( Valve Springs: Gm Ls1 Beehive ), ( Country Of Origin: United States ), ( Item Weight: 50 Lb ), ( Intake Valves: Oem 2.00 )

Review CHEVROLET Gm 853 Cylinder Heads 2.00/1.50 Premium Rebuild 4.8 5.3 5.7 fits LS1 LS6

The **Chevrolet 1256853 GM 853 Cylinder Head Assembly** is a high-performance, precision-engineered component designed exclusively for GM s legendary **LS1, LS6, and Gen III/IV V8 engines**, including the 4.8L, 5.3L, and 5.7L variants. These cylinder heads are meticulously crafted to meet or exceed OEM specifications, ensuring optimal combustion efficiency, durability, and power output for both street and high-performance applications. Built from **high-strength cast iron** with **dry-sump compatible** designs, these heads are engineered to withstand extreme heat, pressure, and stress, making them ideal for forced induction builds, high-RPM applications, or heavy-duty towing scenarios. The **853 series** features **four-valve-per-cylinder architecture** with **1.50-inch intake and 2.00-inch exhaust valve sizes**, allowing for improved airflow and better scavenging of exhaust gases, which directly translates to enhanced horsepower and torque. The **integrated valve springs, retainers, and keepers** are precision-machined for consistent valve operation, reducing the risk of valve float or premature wear, while the **high-flow ports** are designed to maximize volumetric efficiency without compromising structural integrity. These heads are fully compatible with **LS1 (4.8L), LS6 (7.0L supercharged), and LS3/LS7/LS9 (5.3L/6.2L/7.0L) applications**, offering a seamless upgrade path for enthusiasts looking to restore or modify their engines. Whether used in a **restomod project, a high-performance street machine, or a drag racing engine**, these cylinder heads deliver the reliability and performance demanded by modern high-output powerplants. Built to exacting standards, they are a premium choice for those seeking a balance of strength, airflow, and longevity in their GM V8 builds.

### **Pros and Cons of Buying Chevrolet GM 853 Cylinder Heads (LS1, LS6, 4.8L, 5.3L, 5.7L Rebuild Kit)**

#### **Pros:**

1. **Compatibility with High-Performance Engines** These cylinder heads are designed for GM s LS-series engines (LS1, LS6, 4.8L, 5.3L, and 5.7L), which are widely used in performance builds, muscle cars, and street rods. They offer strong airflow and durability for both stock and modified applications.

2. **Rebuild Kit Convenience** Purchasing a pre-packaged rebuild kit (such as the **GM 853 part number**) eliminates the need to source individual components (valves, springs, retainers, seals, etc.) separately. This saves time and ensures all parts are compatible.

3. **Improved Performance Potential** When properly rebuilt, these heads can enhance engine efficiency, power output, and reliability. Upgraded internals (such as stiffer springs, larger valves, or high-flow ports) can support higher RPMs and better breathing.

4. **Cost-Effective for Serious Builders** Compared to buying brand-new factory heads, a rebuild kit is often more affordable while still providing high-quality components. This makes it a practical choice for restomod projects.

5. **Aftermarket Support & Customization** Many aftermarket manufacturers (such as **JE, Edelbrock, Comp Cams, or Summit Racing**) offer compatible upgrades (porting, polishing, or performance camshafts) that can further enhance these heads.

6. **Long-Term Reliability** When installed correctly with proper gaskets, torque specs, and valve adjustment, these heads can last for decades, especially in high-mileage or performance applications.

7. **Easy Installation (With Proper Knowledge)** While some mechanical skill is required, these heads are relatively straightforward to install compared to more complex engine components. A well-documented rebuild kit often includes instructions.

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#### **Cons:**

1. **Requires Mechanical Knowledge** Rebuilding cylinder heads is not a beginner-friendly task. It involves valve grinding, spring installation, torque specifications, and proper sealing. Mistakes can lead to leaks, poor performance, or even engine damage.

2. **Time-Consuming Process** A thorough rebuild can take **10 20 hours**, depending on experience. This includes disassembly, cleaning, machining (if needed), and reassembly.

3. **Potential for Costly Mistakes** Using incorrect torque values, improperly seated gaskets, or mismatched parts (e.g., wrong valve springs) can lead to head gasket failure, valve float, or even catastrophic engine damage.

4. **Depends on Condition of Other Engine Components** If the block, pistons, or crankshaft are worn, rebuilding just the heads won t fully restore engine health. A full engine overhaul may be necessary for optimal performance.

5. **Aftermarket Parts Can Be Expensive** While the kit itself is cost-effective, upgrading to high-performance internals (e.g., **Comp Cams, JE valves, or Edelbrock ports**) can add significant cost if the build is pushed further.

6. **Risk of Poor Quality Kits** Some no-name or budget rebuild kits may use subpar materials (e.g., soft springs, thin valves, or improperly heat-treated parts). Buying from a reputable brand (like **GM OEM, Summit Racing, or Summit Racing s "Performance" line**) is crucial.

7. **Porting & Polishing May Be Needed** Stock heads may require porting or polishing for significant power gains. This adds labor and material costs if not done professionally.

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### **Conclusion & Recommendation**

#### **Who Should Buy This?**

- **Serious LS engine builders** looking to restore or upgrade their heads without buying entirely new ones.

- **Muscle car and hot rod enthusiasts** who want a balance between cost and performance.

- **DIY mechanics** with some experience in engine work who are willing to invest time in a proper rebuild.

- **Restomod projects** where stock heads are being repurposed for a modern engine build.

#### **Who Should Avoid This?**

- **Beginners** without mechanical experience consider hiring a professional or buying pre-built heads.

- **Those on a tight budget** who can t afford mistakes cheap kits or poor installation can lead to expensive repairs.

- **Builders expecting plug-and-play performance** these heads require tuning, valve adjustment, and possibly porting for best results.

#### **Final Recommendation:**

If you are **confident in your mechanical skills** and have access to proper tools (valve spring compressor, torque wrench, dial indicator for head gasket seating), purchasing a **high-quality GM 853 rebuild kit** (preferably from **Summit Racing, JE, or Edelbrock**) is a **smart investment** for LS engine enthusiasts. However, if you lack experience, **consult a professional mechanic** or consider buying **pre-built performance heads** (such as **Edelbrock or JE high-flow heads**) to ensure reliability.

For **maximum performance**, pair the rebuilt heads with:

- A **high-quality camshaft** (e.g., **Comp Cams or Hydra-Matic**)

- **Proper valve springs & retainers** (stiffer for high-RPM applications)

- **Ported & polished heads** (if significant power gains are desired)

- **A tuned engine management system** (ECU flash or standalone controller)

Ultimately, a well-executed rebuild can **extend the life of your LS engine, improve efficiency, and unlock hidden performance** but it demands **precision, patience, and attention to detail**.

Details:

Wear, broken bolts, springs, or burnt valves are all OK. VALVE SEAT CUT: 3 angle 45 deg Performance intake seat cut exhaust New OEM Iron valve guides as needed, 2 YEAR WARRANTY WITH CORE RETURN. Contact me for discount pricing with sale of any pair cylinder heads. So don't be fooled with stock photos or low-resolution hiding defects and poor machining.

This pair of cylinder heads has our same warranty as non-defect. This Limited Warranty is valid ONLY if you are the original purchaser of product and may not be transferred. A eligible vehicle is a that originally equipped with the same part number casting and of purchased. Flood, chemical fallout, salt, hail, or other environment conditions including natural disasters.

Valve seats are replaced as necessary. Guide work performed / replaced with new guides as necessary to oem guide valve stem specifications. See details below, These are not cheap sand blasted spray paint rebuild. Defects do not affect seal, performance or longevity.

Shot / media basting is not the correct surface finish for Factory LS intake gaskets or MLS exhaust. This set of 853 have been built with our Performance 3 Angle Package. Cosmetic defects include Pitting scuffs and scratches, Thread repair/ time Sett solid insert, crack repair, welding as needed normally found on a used core that has been rebuilt. Which fails due to a defect in materials or workmanship as long the product is used normally and accordance with purposes it was designed for.

Intake and exhaust surfaces are chemically cleaned of paint not blasted, NEVER Chinese parts. This limited warranty does not cover incidental, consequential, indirect, or special damages. All parts are thoroughly cleaned, inspected and replaced as necessary before assembly. Pressure tested.

Broken valve, broken guide or fire damage must be approved in advance. Overheating, Lose of overheat tab, Modification or replacement heat tab. Available in many aftermarket valve sizes also. All pictures will supersize when ed on.

Abuse, misuse, disassembly, modification, or neglect of the product. Valve seats are inspected, crack checked and measured for wear replaced as necessary with aftermarket. Use of the product with other third-party product which fail. After machining and assembly all valves are vacuum tested to verify sealing.

On pictures to see supersized detailed of the actual cylinder heads that you purchase. Valve guides are cleaned and measured. A copy of warranty is posted below. Improper use, installation, maintenance, or service.

PARTS INCLUDED 2.000 OEM INTAKE VALVES 1.500 EXHAUST 300M STEEL RETAINERS POLY TOP HAT SEALS GM LS1 BEEHIVE VALVE SPRINGS SHIM AS NEEDED, MACHINING INCLUDES, JET WASH AND DECARBON CORES, INSPECT CHEMICAL DYE CRACK CHECK, GUIDES RESIZED / REPLACED 3 ANGLE PERFORMANCE JOB, RESURFACE WITH .010 COMPRESSION MILL, HAND LAPPED VACUUM TESTED, ALL BOLT HOLES ARE CLEANED, INSPECTED CHASED NOT TAPED FOR A SUPRISE FREE INSTALL, If you want bead blasted, valve lapped, belt sanded, and spray painted rebuild this set is Not for. No cracked head bolt boss, Other Issues such as burnt or bent valves, warped deck, broken springs, stuck guides are all OK. Failures due to a defect in materials or workmanship as long the product is used normally and accordance with purposes it was designed for. Cylinder heads are then resurfaced to correct finish for composite or MLS gasket per application.

Don't BE TAKEN BY paint covered damage to intake and exhaust flange. Some of our heads are Painted NOT this set but never blasted. This limited warranty dose not cover shipping expense. See pictures.

Valve retainers inspected for fit and wear, replaced as necessary. Valve locks are inspected for fit and wear replaced as necessary. Core return must be fully assembled with all parts. Valves are tumble polished measured, replaced as necessary before being face cut and tip.

If you want inexpensive resealed belt resurfaced and painted this is NOT the pair for. Discount includes free domestic USA lower 48 state ground shipping. This pair are not shot blast/spray paint rebuild. Our heads are never painted on gasket sealing surfaced, Do not fall for shot blasted.

Any disassembly beyond what is needed.

part #: 1256853 price

  • $132.49

specifications cylinderheapar:

  • for models: Ls1, Ls6
  • for makes: Chevrolet
  • mpn: 1256853
  • valve guides: New Oem Style Iron
  • valve seals: Poly Intake / High Temp Poly Exhaust
  • custom bundle: Yes
  • items included: See Package
  • core charge: Return Fore For Extended Warranty Only
  • build package: 3 Angle Performance
  • manufacturer warranty: 6 Month
  • finish: Aluminum
  • fitment type: Direct Replacement
  • vintage part: No
  • bore size: 3.890
  • type: Cylinder Head
  • spring seats: Tophat Style
  • oe/oem part number: 12561706
  • exhaust valves: Oem 1.5
  • retainers: Oem Steel Retainers
  • compression mill: .010
  • valve springs: Gm Ls1 Beehive
  • country of origin: United States
  • item weight: 50 Lb
  • intake valves: Oem 2.00

offer cylinderheapar:

  • best offers: True
  • sold: 0
  • started: April 4, 2026
  • quantity: 1
  • availability: In Stock
  • options: Ship-to-home

returns cylinderheapar:

  • paid by: Buyer
  • time: 30 Days
  • policy: Returns Accepted

payments cylinderheapar:

  • credit card: Diners-club
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  • wallet: Google-pay

general cylinderheapar:

  • condition: Remanufactured
  • Car Truck Parts Accessories > Engines Engine Parts > Cylinder Heads

shipping cylinderheapar:

  • class: Economy
  • service: Economy with Adult Signature required
  • transit: 5-12 Days
  • type: Fixed
  • cost: $0.00

seller cylinderheapar:

  • # reviews: 642
  • city: Tehachapi, California
  • rating: 100.0%
for models: ls1, ls6, for makes: chevrolet, valve guides: new oem style iron, valve seals: poly intake / high temp poly exhaust, custom bundle: yes, items included: see package, core charge: return fore for extended warranty only, build package: 3 angle performance, manufacturer warranty: 6 month, finish: aluminum, fitment type: direct replacement, vintage part: no, bore size: 3.890, type: cylinder head, spring seats: tophat style, oe/oem part number: 12561706, exhaust valves: oem 1.5, retainers: oem steel retainers, compression mill: .010, valve springs: gm ls1 beehive, country of origin: united states, item weight: 50 lb, intake valves: oem 2.00,
category: auto parts > car truck parts accessories > engines engine parts > cylinder heads, sku: 11846466175580723,
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