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If anything more than a stock cam is used, springs are required. TechCrunch's weekly newsletter dedicated to all things space, including launch, satellites, space stations and more. Oct 4, 2004 · Vortec heads (and most others) like straight stemmed valves. For a cam, right now I'm looking at the Lunati Voodoo 60103 hyd tappet cam or the Comp cams EX274H cam. golf r pretoria wheels 608" So max lift would be around. 665-inch lift, but when installed at 1. 510" max lift, drop-in valve spring kit for GM L31 Vortec Cylinder Heads This COMP Cams Valve Spring Kit is designed to maximize the potential of GM L31 Vortec cylinder heads when using a flat tappet camshaft. 550" in stock form but you would beat out the seal pretty darn quick, take the seal out and you have plenty of room. accident in hemel hempstead today This is one practice that I have used very successfully with Vortec heads. Jul 13, 2014 · The vortec heads I bought from summit at the time of purchase said they had a max lift of. All that's stated in the description is that they have Z28 springs, LT4 retainers, a max lift of. These "stock diameter. 800-inch height, the. Undercut valves create unwanted turbulence and a decrease in intake charge velocity (they add volume (slowing the gases) to the overall "port" volume just behind the valve where max velocity is required. dnd clapper meaning 1982 C10 SWB pickup: Unmolested base truck, original paint. ….

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