Conventual 8˚ Lock
• Increased Contact Area - eliminates the possibility of contact above groove • Thinner Lock Dimension - provides superior conformability to valve stem • Increased retainer thickness due to thinner lock • More design flexibility to accommodate today's smaller spring diameters
900 Series Lock
Xceldyne 900 Series Locks • Compatible with Xceldyne's popular Top Lock Series Retainers providing the engine builder three installed height options: 0.050" more, Standard and 0.050" less. • Thinner Lock Dimension - provides superior conformability to valve stem • Increased retainer thickness due to thinner lock • More design flexibility to accommodate today's smaller spring diameters
Compatible Retainers & Locks 8° .500 Gage Retainers Taper Gage Part# Material Angle Diameter
XRE512 Ti 17 XRE512-S Premium Steel XRE513-S Premium Steel XRE521-LTW Ti 17 XRE540-TL Ti 17 XRE565-TL Ti 17 XRE572-TL Ti 17 XRE572-TL-S Premium Steel XRE573-TL Ti 17 XRE574-TL Ti 17 XRE574-TL-S Premium Steel XRE575-TL Ti 17 XRE575-TL-MC* Ti 17 * Thermal Spray Coating
8° 8° 8° 8° 8° 8° 8° 8° 8° 8° 8° 8° 8°
0.500 0.500 0.500 0.500 0.500 0.500 0.500 0.500 0.500 0.500 0.500 0.500 0.500
outer Spring Inner Spring Middle Spring Outside Spring Inner Spring Middle Spring Diameter Diameter Diameter Diameter Type Step Height Step Height
0.935 0.935 0.898 0.895 1.090 1.195 1.090 1.090 1.105 1.090 1.090 1.003 1.003
0.665 0.665 0.629 0.655 0.800 0.635 0.780 0.780 0.710 0.765 0.765 0.707 0.707
-- -- -- -- -- 0.870 -- -- -- -- -- -- --
1.150 1.150 1.150 1.090 1.350 1.450 1.350 1.350 1.370 1.350 1.350 1.250 1.250
Double Double Double Double Double Triple Double Double Double Double Double Double Double
0.100 0.100 0.100 0.075 0.100 0.100 0.100 0.100 0.100 0.070 0.070 0.070 0.070
-----.080 --------
8° .500 Gage Locks Stem Taper Groove installed gage Lock Part# Material Diameter Angle type height diameter Type
XLO577-S XLO979-C XLO980-C XLO981-C XLO989-C XLO991-C XLO992-C XLO993-C XLO994-C
Steel Titanium Titanium Titanium Titanium Titanium Titanium Titanium Titanium
11/32 7mm 7mm 7mm 11/32 11/32 5/16 5/16 5/16
8° 8° 8° 8° 8° 8° 8° 8° 8°
Square Radius Radius Radius Radius Radius Radius Radius Radius
Standard 0.050 in. less Standard 0.050 in. more 0.050 in. less 0.050 in. more 0.050 in. less Standard 0.050 in. more
0.500 0.500 0.500 0.500 0.500 0.500 0.500 0.500 0.500
--Lash Cap Recess Lash Cap Recess ---Lash Cap Recess Lash Cap Recess
8° .500 Gage Top Locks
Xceldyne - Valve Spring Retainers/Locks
Top Lock Radius Groove Valve Lock Xceldyne Top Lock Valve Locks The Top Lock ensures that the valve keeper groove is positioned at the top of the lock:
Stem Taper Groove installed gage Lock Part# Material Diameter Angle type height diameter Type
XLO806-C XLO810-C XLO810-C-S XLO811-C XLO812-C
Titanium Titanium Steel Titanium Titanium
6mm 7mm 7mm 5/16 11/32
8° 8° 8° 8° 8°
Radius Radius Radius Radius Radius
Top Lock Top Lock Top Lock Top Lock Top Lock
0.500 0.500 0.500 0.500 0.500
------
7° .350 Gage Top Locks Stem Taper Groove installed gage Lock Part# Material Diameter Angle type height diameter Type
XLO814-C XLO819-C
Titanium Titanium
7mm 6mm
7° 7°
Radius Radius
Top Lock Top Lock
0.350 0.350
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Please refer to page 117 for the proper fit of Valve Spring Retainer/Lock combination. Check out www.cvproducts.com for technical guidance for your Valve Spring Retainers/Locks.
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