Mayolives Posted July 10, 2004 Share Posted July 10, 2004 I have checked with Nissan Motorsports and Arizona Z Car. Their ss valves are for earlier heads and will not work with my 1982 P90 head with out some mods. The head will be used on a torbo set up and will maintain stock height. I know the custom valve peaple could make the valves but they will cost a small fortune. Does anyone make a ss valve that will fit other than the custom folks?.....mayolives Quote Link to comment Share on other sites More sharing options...
speeder Posted July 10, 2004 Share Posted July 10, 2004 Ferrea has P90 - length valves in their catalog. My machine shop got them for me when doing the head. They were not in stock and had to be made- had to wait about 3 weeks. About 22.00 apiece. Quote Link to comment Share on other sites More sharing options...
Doug71zt Posted July 11, 2004 Share Posted July 11, 2004 Mayolives - I just ordered a set identical to Speeder's from Ferrea. You may be able to get them on the same run as mine, cutting the order time down a bit. I ordered P/N F1839P for the intake(stock size) and P/N F1842P for the exhaust (1mm oversize). I was looking for a quality SS valve for quite a while till Speeder turned me on to Ferrea. The only other ones for the P90 are made by SI and Dave Rebello recommends not using them as the stock valves are a higher quality. If you are not shooting for 400HP or over, it is the consensis that the stock valves will be fine. Manley used to make P-90 valves, but is not interested in making just one set. They would like you to order 100 or so of each design, in order for them to tool up. Hope that this helps you out. Doug Quote Link to comment Share on other sites More sharing options...
speeder Posted July 11, 2004 Share Posted July 11, 2004 Guys, Doug's setup (standard size intakes and 1mm oversize exhausts) is what I'm using. After studying other high horspower L motor setups, I've learned that there is no further benefit from larger valves unless major porting and unshrouding is done. I've also heard that you should stay away from SI P90 Z valves. Quote Link to comment Share on other sites More sharing options...
spork Posted July 12, 2004 Share Posted July 12, 2004 ferreas here too. 1mm larger exhuast with stock sized intake Quote Link to comment Share on other sites More sharing options...
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