rreford Posted November 9, 2001 Share Posted November 9, 2001 Does anyone have specs on valve length of these cylinder heads? I'm looking at shaving a p79 and using the N42/47 valves to keep geometry correct. Also, anyone know if Bryan Little's 'Datsun Z Garage' site can be found at a new site? All the references I'm finding lead to a dead-end site. Thanks! Quote Link to comment Share on other sites More sharing options...
DAW Posted November 10, 2001 Share Posted November 10, 2001 the lengths in mm are: N42/47 Int: 115.2 Ex: 116.0 P79/P90 Int: 113.1 Ex: 113.9 So about 2mm . I don't believe this is going to help you with shaving the head, i.e. swapping in the longer valves. I'm assuming you're talking about shimming the cam towers to keep the timing chain length/geometry intact. I think you may make up more distance than you need. However, if you were to add a regrind high performance cam at the same time (using the added valve length instead of thicker lash pads that you would need otherwise), then both factors may justify the 2mm distance. If you were to go with the cam, and are on the ridiculous sort of budget I'm on, it looks to me like the Nissan 4cyl Z series head might provide a good alternative, plentiful, valve spring with more pressure than the L series springs. You'd have to check that out to confirm. DAW Quote Link to comment Share on other sites More sharing options...
rreford Posted November 17, 2001 Author Share Posted November 17, 2001 Thanks! Quote Link to comment Share on other sites More sharing options...
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