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For up to 7500rpm and 30psi boost Kelford Cams recommend valve spring KVS109-1JZ
Spline drive is a better system if you have your crank out when upgrading which usually happens at the same time
street / strip
WG38/40 5psi Grey Inner Spring
Kit is designed to fit the following SINGLE CAM engines:
Barra BA FG Falcon Cams 218-SP BOV 60mm For up to 7500rpm and294 302 12. 40mm 12. 40mm Valve Lift 294 302 pro drag racing cams to suit high RPM competition cars. These are to suit a solid lifter conversion, not to be used with hydraulic lifters. Suits extreme high power Barra engines making 1600hp+ with a 85mm+ turbo. Kelford Cams recommend the KVS40 EXTREME valve spring kit.
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