North American Turbocoupe Organization



N/A valves
Superstroke17 Offline
Junior Member
#1
Hello I'm new here with some issues. Of course my turbo head was found to be cracked. Well i had my machine shop on waiting while i searched for another head. Well he closed the doors without me knowing and i lost my old head and valves. I opened the chambers up on a n/a head but i no longer have the turbo valves. Question is how long will the na valves hold up on stock -15lb boost. Thanks Also if anyone has any valves laying around let me know
87 TC 5 speed, new motor, T3 upgrade, K&N cone filter!!!!!!!!!!!!
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Pete D Offline
Administrator
#2
I don't know how long NA valves might last. Probably depends on how much and how often you lean on it. You could use SS valves in it, many have. This works if you want to go over sized. Or put an ad in the Parts Wanted forum for a set of turbo exhaust valves.
Pete Dunham


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turbo tom Offline
Senior Member
#3
I ran 30# boost on mine for 2 years and know several others running na valves without any issues. I upgraded to bo-ports stainless valves as part of a package deal with the cam and so on. If youre running a mild combo, the na valves should be fine. Tom
Speak softly and carry a ...errr really big turbo. 84 GT R.I.P 94 F250 Turbo Diesel
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Superstroke17 Offline
Junior Member
#4
Thanks that was the answer i was hoping for. If everything works out within a year I'll have a head worked up for this thing anyway. I just want it to last till then on stock boost. Thanks again and if you know anyone else running them have them post. The more that say it'll be fine the safer I'll feel
87 TC 5 speed, new motor, T3 upgrade, K&N cone filter!!!!!!!!!!!!
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turbo tom Offline
Senior Member
#5
turbo dad on turboford has been running 30+ on the na valves since he built it 5 or 6 years ago. do a search over there as I asked the same question and there were numerous replys. IIRC the general concensus was stock or close to stock your fine. The harder you push them, aka higher boost or rpms, the more chance theyll fail. rpms will kill a valve faster than boost. Aftermarket cams and higher valve spring pressures will def kill any stock valves.
Speak softly and carry a ...errr really big turbo. 84 GT R.I.P 94 F250 Turbo Diesel
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