turbogrill Posted August 29, 2017 Share Posted August 29, 2017 Hi, Any suggestion what exhaust valves to get for a mild enduro race engine? Max RPM 6500-7000, 200hp - 250hp It would be a stock replacement for a N47 head. Would cheapest from Zcardepot do it? Quote Link to comment Share on other sites More sharing options...
clarkspeed Posted August 30, 2017 Share Posted August 30, 2017 Si valves Quote Link to comment Share on other sites More sharing options...
Chickenman Posted August 30, 2017 Share Posted August 30, 2017 (edited) I wouldn't cheap out on Valves. Bad place to try and save money. Cheap valves can drop a valve head = $$$$ Edit: SI Valves are good, Ferrera are excellent. Manley used to make excellent SS valves for Nissan. They may still make them, but not listed in current catalogs. If you can find NOS Nissan valves, they are very good quality as well. Edited : Sorry about the SI Valve info. It was SuperTech that I was thinking of. Very popular in Audi/VW Turbo engines Edited September 3, 2017 by Chickenman Quote Link to comment Share on other sites More sharing options...
HuD 91gt Posted August 31, 2017 Share Posted August 31, 2017 I had a bad experience with SI valves. If you do this, ensure you are using bronze guides. This is a must and fairly well known with most builders. My builder did not and it cost me. Quote Link to comment Share on other sites More sharing options...
Leon Posted August 31, 2017 Share Posted August 31, 2017 I also had a bad experience with SI, they ate the valve guides in short order. Go with OEM. Quote Link to comment Share on other sites More sharing options...
turbogrill Posted August 31, 2017 Author Share Posted August 31, 2017 I ended up getting valves from DatsunSprit, not the expensive DSI but the other ones he sells. Not sure what brand but I trust that it's good quality, I think he uses the same for his less crazy builds. Quote Link to comment Share on other sites More sharing options...
primaz Posted September 2, 2017 Share Posted September 2, 2017 On 8/31/2017 at 1:56 PM, turbogrill said: I ended up getting valves from DatsunSprit, not the expensive DSI but the other ones he sells. Not sure what brand but I trust that it's good quality, I think he uses the same for his less crazy builds. Datsun Spirit makes great engines and I recommend both fully built engines from them as well as their parts they sell for those willing to try to DIY. I have two of their engines, a Stage II mild engine for my wife and a 3.0 liter bottom end which uses a DL Potter ported head and Datsun Spirit cam. I think they are the best Datsun builders now that Don Potter has passed. Quote Link to comment Share on other sites More sharing options...
clarkspeed Posted September 12, 2017 Share Posted September 12, 2017 Note on SI valves. My head builder always has to straighten them before install. If you do that, they work fine. Ferrara and Manley were custom last time I checked. Quote Link to comment Share on other sites More sharing options...
Leon Posted September 12, 2017 Share Posted September 12, 2017 32 minutes ago, clarkspeed said: Note on SI valves. My head builder always has to straighten them before install. If you do that, they work fine. Ferrara and Manley were custom last time I checked. Wow, interesting. I guess that explains my smoked valve guides. FWIW, I ended up going with OEM exhaust and Supertech Intakes by recommendation of Dave Rebello. Quote Link to comment Share on other sites More sharing options...
madkaw Posted September 12, 2017 Share Posted September 12, 2017 I also had a bad experience with SI . Wouldn't pass a hardness test that the machinist did- he wouldn't use them . Quote Link to comment Share on other sites More sharing options...
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