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Upgrading the valve springs on your GM 3100/3400 (3x00) engine with LS-style springs is one of the most effective enhancements for improved valve control and higher RPM performance. This guide provides step-by-step details for selecting the appropriate springs, retainers, supporting modifications, and installation techniques for optimal results. Check out the article on Wbodytech.com LS Valve Spring Upgrade Guide for GM 3100/3400 Engines
Recommended LS-Style Valve Springs:
1. GM LS6 Valve Springs (Part #12499224):
• Installed Height: 1.800”
• Seat Pressure: 90 lbs @ 1.800”
• Open Pressure: 260 lbs @ 1.250”
• Max Lift Capability: ~.550”
• Coil Bind Height: 1.085”
• Application: Ideal for mild performance upgrades and street applications.
2. PAC 1218 Springs:
• Installed Height: 1.800”
• Seat Pressure: 130 lbs @ 1.800”
• Open Pressure: 318 lbs @ 1.200”
• Max Lift Capability: ~.600”
• Coil Bind Height: 1.140”
• Application: Recommended for high-performance builds and aggressive camshafts.
Compatible Retainers and Valve Locks:
• Retainers: Comp Cams LS-style Retainers (#787-16 or #774-16), GM OEM LS Retainers (Part #10166344)
• Valve Locks: Comp Cams #623-16 or GM OEM #10166345 (7-degree)
Supporting Modifications:
• Camshaft: Choose custom grind camshafts from WOT-Tech that match your intended RPM and power goals.
• Timing Chain: Upgrade to a Cloyes or Rollmaster Double-Roller timing set for increased reliability and reduced timing chain stretch.
• Valve Seals: Viton valve seals are recommended to ensure improved sealing and longevity.
• Rocker Arms: Roller-tip or full roller rockers are recommended for performance builds, though stock rocker arms may suffice for mild cam upgrades.
Pushrod Information:
• Stock pushrods can typically be used for mild performance upgrades and moderate camshaft profiles.
• Custom-length pushrods may be necessary for aggressive cam profiles, significant head milling, or when significant valve train geometry changes are made. Always verify pushrod length using an adjustable pushrod checker.
Installation Guide:
1. Measure and verify installed height (~1.800”) carefully using a height micrometer or dedicated measuring tool.
2. Ensure retainer-to-seal clearance is at least .050” at maximum lift.
3. Verify coil bind clearance to prevent spring damage.
4. Check and adjust rocker arm geometry to ensure accurate valve stem tip alignment, preventing premature wear and promoting efficient valve operation.
5. Lubricate all components thoroughly during assembly to prevent initial startup wear.
6. Double-check all torque settings on rocker arms, retainers, and valve covers according to manufacturer specifications.
Benefits of Upgrading:
• Enhanced RPM capability and stability
• Reduction or elimination of valve float issues
• Improved reliability and durability of the valve train
• Increased overall engine performance, power output, and responsiveness
Conclusion:
Following these detailed steps and carefully selecting your valve train components will significantly enhance the performance and reliability of your GM 3x00 engine. If you are unsure about any part of the installation process, always consult professional advice or detailed installation manuals specific to your application.
Recommended LS-Style Valve Springs:
1. GM LS6 Valve Springs (Part #12499224):
• Installed Height: 1.800”
• Seat Pressure: 90 lbs @ 1.800”
• Open Pressure: 260 lbs @ 1.250”
• Max Lift Capability: ~.550”
• Coil Bind Height: 1.085”
• Application: Ideal for mild performance upgrades and street applications.
2. PAC 1218 Springs:
• Installed Height: 1.800”
• Seat Pressure: 130 lbs @ 1.800”
• Open Pressure: 318 lbs @ 1.200”
• Max Lift Capability: ~.600”
• Coil Bind Height: 1.140”
• Application: Recommended for high-performance builds and aggressive camshafts.
Compatible Retainers and Valve Locks:
• Retainers: Comp Cams LS-style Retainers (#787-16 or #774-16), GM OEM LS Retainers (Part #10166344)
• Valve Locks: Comp Cams #623-16 or GM OEM #10166345 (7-degree)
Supporting Modifications:
• Camshaft: Choose custom grind camshafts from WOT-Tech that match your intended RPM and power goals.
• Timing Chain: Upgrade to a Cloyes or Rollmaster Double-Roller timing set for increased reliability and reduced timing chain stretch.
• Valve Seals: Viton valve seals are recommended to ensure improved sealing and longevity.
• Rocker Arms: Roller-tip or full roller rockers are recommended for performance builds, though stock rocker arms may suffice for mild cam upgrades.
Pushrod Information:
• Stock pushrods can typically be used for mild performance upgrades and moderate camshaft profiles.
• Custom-length pushrods may be necessary for aggressive cam profiles, significant head milling, or when significant valve train geometry changes are made. Always verify pushrod length using an adjustable pushrod checker.
Installation Guide:
1. Measure and verify installed height (~1.800”) carefully using a height micrometer or dedicated measuring tool.
2. Ensure retainer-to-seal clearance is at least .050” at maximum lift.
3. Verify coil bind clearance to prevent spring damage.
4. Check and adjust rocker arm geometry to ensure accurate valve stem tip alignment, preventing premature wear and promoting efficient valve operation.
5. Lubricate all components thoroughly during assembly to prevent initial startup wear.
6. Double-check all torque settings on rocker arms, retainers, and valve covers according to manufacturer specifications.
Benefits of Upgrading:
• Enhanced RPM capability and stability
• Reduction or elimination of valve float issues
• Improved reliability and durability of the valve train
• Increased overall engine performance, power output, and responsiveness
Conclusion:
Following these detailed steps and carefully selecting your valve train components will significantly enhance the performance and reliability of your GM 3x00 engine. If you are unsure about any part of the installation process, always consult professional advice or detailed installation manuals specific to your application.
