--- title: What Are the Torque Specifications and Tightening Sequences for BluePrint Ford, Small Block Chevy, BBC, , Chrysler 408 & 426, and LS Engine Cylinder Heads? description: Torque specifications and bolt tightening sequences for BluePrint Ford, Small Block Chevy, and LS cylinder heads and LS intake manifolds. --- [Skip to content](https://knowledgebase.blueprintengines.com/knowledge/what-are-the-torque-specifications-and-tightening-sequences-for-blueprint-ford-small-block-chevy-and-ls-engine-cylinder-heads#main-content) English Show submenu for translations ![IN CRATE ENGINES..png\]](https://knowledgebase.blueprintengines.com/hs-fs/hubfs/IN%20CRATE%20ENGINES..png?height=40&name=IN%20CRATE%20ENGINES..png) Open main navigation Close main navigation - English Show submenu for translations - Go to www.blueprintengines.com Go to www.blueprintengines.com How can we help you? - There are no suggestions because the search field is empty. 1. 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[Engine Specs](https://knowledgebase.blueprintengines.com/knowledge/engine-specs?hsLang=en) # What Are the Torque Specifications and Tightening Sequences for BluePrint Ford, Small Block Chevy, BBC, , Chrysler 408 & 426, and LS Engine Cylinder Heads? ### **Ford 302-347 and 408-427 Cylinder Head Torque Sequence** Tighten head bolts from the center outward using the sequence shown below. ### **Ford 302-347 Head Bolt Torque** Torque the cylinder head bolts using the method appropriate for the fasteners being installed: - **55 ft-lbs** using a **Torque Stick** - **70 ft-lbs** using a **Torque Wrench** - **70 ft-lbs** using a **Torque Wrench with Paint Socket** ### **Ford 408-427 Head Bolt Torque** Torque the cylinder head bolts in four steps: 1. **45 ft-lbs** 2. **70 ft-lbs** 3. **90 ft-lbs** 4. **100 ft-lbs Final Torque** **![](https://knowledgebase.blueprintengines.com/hs-fs/hubfs/undefined-3.png?width=670&height=352&name=undefined-3.png)** --- ### **Small Block Chevy Cylinder Head Torque Sequence** Follow the numbered sequence shown below, starting with the center fasteners and working outward. **SBC Head Bolt Torque** Torque all cylinder head bolts in three steps: 1. **45 ft-lbs** 2. **55 ft-lbs** 3. **65 ft-lbs Final Torque** ### **SBC Rocker Arm Stud Torque** **Torque rocker arm studs to 45 ft-lbs.** **Important:** Apply an oil-resistant RTV sealant to all intake-side rocker arm studs during installation. --- ### **BBC (PS8012 & PS8013) Cylinder Head Torque Specifications** **Important** - **Do NOT apply lubricant to the head bolts.** - **Do NOT remove the factory-applied thread sealer from the bolts.** ### **Torque Procedure** 1. Torque all head bolts to **37 ft-lbs** following the proper tightening sequence. 2. Following the same sequence, back off each bolt **one at a time**. 3. Retorque all bolts to **37 ft-lbs** in sequence. 4. Apply the final angle torque: - **Long bolts: +150°** - **Short bolts: +90°** 5. Verify final torque using a manual torque wrench: - **All bolts should click at 85 ft-lbs.** ### **Important Notes** - Maintain the specified bolt sequence throughout the procedure. - Do not lubricate the threads or under-head surfaces of the bolts. - Do not remove the pre-applied thread sealer. - Use a manual torque wrench for final verification. --- ### **Chrysler 408 Cylinder Head Torque Specifications** When installing Chrysler 408 cylinder heads, use **moly lubricant** on the fastener threads and under the bolt heads unless otherwise specified by the fastener manufacturer. Torque all cylinder head bolts in the proper tightening sequence using the following three-step procedure: 1. **50 ft-lbs** 2. **105 ft-lbs** 3. **105 ft-lbs Final Torque** ### **Important Notes** - Apply **moly lubricant** prior to installation. - Follow the recommended cylinder head bolt tightening sequence. - Torque all fasteners in stages to ensure even clamping force across the head gasket. - Use a calibrated torque wrench. - If aftermarket fasteners are used, follow the manufacturer's specifications if they differ from those listed above. --- ### **Chrysler 426 Cylinder Head Torque Specifications** Proper cylinder head installation is critical for head gasket sealing and consistent clamping force. Follow the torque sequence diagram and complete each pass in the order listed below. **Chrysler 426 Head Bolt Torque Procedure** **First Pass** - Torque bolts **1-10** to **25 ft-lbs**. - Torque bolts **11-15** to **15 ft-lbs**. ### **Second Pass** - Torque bolts **1-10** to **40 ft-lbs**. - Verify bolts **11-15** remain at **15 ft-lbs**. ### **Third Pass** - Torque bolts **1-10** to **45 ft-lbs**. - Mark bolts **1-10** with a paint pen at the **12 o'clock position**. ### **Fourth Pass** - Rotate bolts **1-10** an additional **+90°**. - Torque bolts **11-15** to **21 ft-lbs**.  ![](https://knowledgebase.blueprintengines.com/hs-fs/hubfs/undefined-4.png?width=852&height=590&name=undefined-4.png)  ### **Important Notes** - Follow the Chrysler 426 cylinder head torque sequence diagram throughout the procedure. - Use a paint marker before the final angle-torque step to provide a visual reference for the 90-degree rotation. - Complete all four torque passes in order. - Use a calibrated torque wrench and an angle gauge for the final rotation. - Verify that each bolt has received the required final torque or angle specification before installation is complete. --- ### **LS Cylinder Head Torque Sequence** Follow the tightening sequence shown in the LS Head Bolt Tightening Sequence diagram. **LS Cylinder Head Torque Procedure** **Short M8 Head Bolts** - First Pass: **22 ft-lbs** ### **Long M11 Head Bolts** - First Pass: **22 ft-lbs** - Second Pass: **(+) 90 degrees** - Third Pass: **(+) 70 degrees** ### **Important LS Notes** - Always use the proper torque-angle procedure. - Torque-to-yield head bolts should not be reused. - Follow the bolt sequence exactly to ensure proper gasket sealing. --- ### **LS Intake Manifold Bolt Tightening Sequence** Follow the sequence shown in the LS Intake Manifold Bolt Tightening Sequence diagram. **LS Intake Manifold Torque Specification** Torque all intake manifold bolts to: - **44 in-lbs (5 N·m) First Pass** - **89 in-lbs (10 N·m) Final Pass** ### Work through the sequence shown and complete both torque passes before installation is considered complete. --- ***Installation Tips*** - Verify all threaded holes are clean and free of debris. - Apply thread sealant to any fasteners that enter coolant passages. - Use the lubricant specified by the fastener manufacturer. - Always torque fasteners in multiple stages. - Use a calibrated torque wrench. - Follow aftermarket fastener manufacturer specifications when they differ from those listed above.   - [General Support](https://knowledgebase.blueprintengines.com/knowledge/general-support?hsLang=en) - [Technical Support](https://knowledgebase.blueprintengines.com/knowledge/technical-support?hsLang=en#main-content) - [General Engine FAQ](https://knowledgebase.blueprintengines.com/knowledge/technical-support?hsLang=en#general-engine-faq) - [BluePrint GM Style Engines](https://knowledgebase.blueprintengines.com/knowledge/technical-support?hsLang=en#blueprint-gm-style-engines) - [BluePrint Ford Style Engines](https://knowledgebase.blueprintengines.com/knowledge/technical-support?hsLang=en#blueprint-ford-style-engines) - [Transmissions](https://knowledgebase.blueprintengines.com/knowledge/technical-support?hsLang=en#transmissions) - [Fuel Systems](https://knowledgebase.blueprintengines.com/knowledge/technical-support?hsLang=en#fuel-systems) - [Parts and Accessories](https://knowledgebase.blueprintengines.com/knowledge/technical-support?hsLang=en#parts-and-accessories) - [Carburetors](https://knowledgebase.blueprintengines.com/knowledge/technical-support?hsLang=en#carburetors) - [Alternator](https://knowledgebase.blueprintengines.com/knowledge/technical-support?hsLang=en#alternator) - [Term X](https://knowledgebase.blueprintengines.com/knowledge/technical-support?hsLang=en#term-x) - [Valve Train](https://knowledgebase.blueprintengines.com/knowledge/technical-support?hsLang=en#valve-train) - [Factory Five FAQ](https://knowledgebase.blueprintengines.com/knowledge/factory-five-faq?hsLang=en) - [Engine Specs](https://knowledgebase.blueprintengines.com/knowledge/engine-specs?hsLang=en) - [Discontinued Engine Specs](https://knowledgebase.blueprintengines.com/knowledge/discontinued-engine-specs?hsLang=en#main-content) - [Engine Support](https://knowledgebase.blueprintengines.com/knowledge/discontinued-engine-specs?hsLang=en#engine-support) [![Chill listening crop-3](https://knowledgebase.blueprintengines.com/hs-fs/hubfs/IN%20CRATE%20ENGINES..png?width=92&height=24&name=IN%20CRATE%20ENGINES..png "Chill listening crop-3")](http://navy-blueprint-logo) www.blueprintengines.com Help Center Copyright © 2026, BluePrint Engines