Why Upgrade Valve Springs?
When installing performance cams or increasing boost:
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RPM limits increase
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Valve lift increases
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Cylinder pressure increases
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Spring control becomes critical
Stock springs can struggle to keep valves seated properly at high RPM.
Brian Crower premium valves guides are made from manganese silicon aluminum bronze alloy and CNC machined to exacting tolerances. Brian Crower guides are resistant to cracking and corrosion, while reducing friction and insures high lubrication even at elevated engine temperatures and RPM’s. The perfect replacement to worn or damaged guides and 100% compatible with Brian Crower lineup of stainless steel valves.
BC1100 Key Features
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High-performance single valve spring
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Designed for 4G63 turbo applications
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Increased seat and open pressure vs OEM
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Supports upgraded camshafts
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Suitable for street and moderate race builds
Translation: better valve control, safer high-RPM operation.
Ideal Applications
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Mild to moderate cam upgrades
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Higher rev limits
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Bolt-on turbo builds
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Street/track performance setups
For extreme RPM or large cam profiles, dual spring setups may be recommended.
Installation Notes
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Measure installed height
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Check coil bind clearance
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Replace retainers if required
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Verify valve stem seals during install
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Confirm cam specs compatibility
Because valve train geometry matters.
Final Verdict
The Brian Crower BC1100 Valve Spring for 4G63 is a smart upgrade when adding cams or increasing boost on Eclipse, Evo, and similar turbo builds. Improved valve control, better high-RPM reliability, and proven performance pedigree.
Because valve float ends builds fast.
John Vanlandingham –
Good price for a great product giving about 90 lbs on seat pressure in an 8v Volvo Redblock (1976—-1996 B21 , B23 or B230) 1 set of springs (16) goes to 2 heads so even better price.