Thats right! You can run .550+ lift on a stock Vortec guide and Stock valves! No machine work. Lots of info in this video! Please watch the whole video for all the details
The video shows what springs we will be using for the L31 budget build with a LT4 Hotcam as well as how to get .570+ lift out of a Vortec head with a stock guide and stock valve length.
**Screw in Studs should be used over 300 lbs of open spring pressure or 6000+ rpm**

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Summit .550 Springs # SUM-174002
Summit .600 Springs # SUM-174004
Summit Retainers # SUM-174003-3
Summit +.050 Offset Keepers # SUM-174003-4
Competition Products +.030 Offset Keepers part# VTO4134
Felpro Valve Seals - SS72861 link [ Ссылка ]

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