turbogrill Posted May 26, 2017 Share Posted May 26, 2017 Hi, The 300zx outer vavle springs are about 0.1" taller than the L28 valve springs. Could I use them in 0.080" shimmed P79 and not have to deal with with adding shims for the springs? The will be installed at slightly different installed height but this is good since it would add some extra pressure for a mild afermarket cam? Thanks Quote Link to comment Share on other sites More sharing options...
skirkland1980 Posted May 26, 2017 Share Posted May 26, 2017 Adding shims under the cam brackets doesn't effect the springs. What you'll need are thicker lash pads. Quote Link to comment Share on other sites More sharing options...
ZHoob2004 Posted May 26, 2017 Share Posted May 26, 2017 I believe what is meant is the idea of shave the head, shim the towers and use n47 valves. the valves are between .080 and .100 longer (depending who you ask) and thus people say to shim the springs that same amount to keep the pressure and installed height the same. I'm also curious about this, could one get away without shimming the springs by using stiffer valve springs they were going to use anyway? This will give pressures slightly below advertised specs, but I don't think it'll make a huge difference. Theoretically this could also give another .080-.100 of clearance for additional lift (unless the inner spring binds first) Quote Link to comment Share on other sites More sharing options...
skirkland1980 Posted May 26, 2017 Share Posted May 26, 2017 Use Schneider springs 68022 110/240seat pressure and matching retainers. Then get the correct lash pads. Quote Link to comment Share on other sites More sharing options...
turbogrill Posted May 26, 2017 Author Share Posted May 26, 2017 I believe what is meant is the idea of shave the head, shim the towers and use n47 valves. the valves are between .080 and .100 longer (depending who you ask) and thus people say to shim the springs that same amount to keep the pressure and installed height the same. I'm also curious about this, could one get away without shimming the springs by using stiffer valve springs they were going to use anyway? This will give pressures slightly below advertised specs, but I don't think it'll make a huge difference. Theoretically this could also give another .080-.100 of clearance for additional lift (unless the inner spring binds first) Yes and getting slightly lower seat pressure might not be too bad, specially if you have a cam with a ramp that is not too agressive. Goot point with the coil bind, it should buy you some margin. Quote Link to comment Share on other sites More sharing options...
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