My LS7 Valvetrain Info Well I finally got all of the parts of my valvetrain for my LS7 headed LS1 block. I decided to weigh each reciprocating part, except for the rockers, lifters, and pushrods, so I can get a good idea of what I'm working with. It's also for reference for anyone else with similar setups or plan. Here's the setup: GM LS7 Heads... GM LS7 Rocker Arms Comp OE Replacement Lifters GM LS7 Titanium Intake Valve: 76.7g GM LS7 Intake Valve Lash Cap: 1.8g GM LS7 Sodium Filled Exhaust Valve: 72.7g PRC Dual Spring: 93.3g PRC Titanium Retainer: 10.8g GM LSx Valve Locks: 2.6g for pair, or 1.3g ea Camshaft: 230/248, .628"/.630", XE-R/XE, 112+2 LSA, Comp Cams grind Everything should work nicely together. The valvetrain overall is fairly light in my opinion. I'm definitely glad I went with the LS7 valves instead of stainless steel ones. I would have gone with lighter springs but I wanted a dual spring incase of a failure. Considering my cam lift and application, the PRC springs seemed like a reasonable choice. We'll see how it holds up on the dyno in a few weeks! |
Do those valves set-up at 1.850"? For some reson I thought they set-up at 1.950", in which case the PRC kit wouldn't work. May just be thinking about the ET stuff, but it's worth measuring. |
Just measured the installed height(top of spring seat to bottom of retainer) and it came out to about 1.810". You almost gave me a heart attack Jason! |
That camshaft duration looks very nice for the LS7 application! |
Originally Posted by John B That camshaft duration looks very nice for the LS7 application! |
Thanks for your order Mike. This is a very nice grind for a street driven LS7 setup. I'm impressed at your thoroughness at arriving at this choice. This has a nice balance of driveability and yet will pull hard to 7000rpms. I look forward to seeing your progress. Richard :) |
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