![]() 600 lift depending on who you ask, and 130# seat at 1.8 if you're gonna run big hyd or a roller cam. And then there is HD z28 spring version, good for. They also have the stock spring kit if you're at or near stock on your cam but can't take much more. I called sdpc and they told me that is the spring/retainer combo they use on those heads so I'd be checking. If you get them to 1.75, you'll be at 90lbs, still wouldn't run much of a cam on that either. What I learned when I went to install is that the new retainer changes the installed height to 1.8 so unless you want to put in 100 thou worth of shims, you ain't gonna have sh#t for seat pressure. That spring is rated at 110# on the seat at 1.7 installed. I recently bought a set of their $30 standard z28 springs and $30 hardened steel retainers to upgrade my own heads. 525 lift z28 spring upgraded version id be looking real close at the installed height of the spring. Which kit are you looking at? If you buy the.
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