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unleaded gas for early 911's?

I'm sure this has probably been addressed before but I was wondering if it would be OK to use today's unleaded fuels in an early (72-ish) 911? Would you have to change valves first? I remember adding some foul looking liquid to my 71 240Z with each fill-up when I could no longer find leaded premium (whether it really did anything I don't know but I got 244,000mi on it before moving on). Thanks for your patience

Old 01-28-2004, 07:54 PM
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I think that Porsche valve seats are hard enough to handle unleaded...works for me, anyway...
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Old 01-28-2004, 07:57 PM
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Most early aluminum heads will have no problems with unleaded since the seat inserts are much more durable than the cast variety in iron heads which are the most in need of a coating additive.
Old 01-28-2004, 07:58 PM
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Gosh I hope it's ok since that is all I can get.

I asked Steve Weiner this question a few years ago and he assured me that I would be ok.
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Old 01-28-2004, 07:59 PM
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Quote:
Originally posted by 350HP930
Most early aluminum heads will have no problems with unleaded since the seat inserts are much more durable than the cast variety in iron heads which are the most in need of a coating additive.
That's what I meant to say..
Old 01-28-2004, 08:00 PM
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If it's a 72 then you get away with regular unleaded (87) because it's such a low compression.
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Old 01-28-2004, 08:12 PM
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Sure -- I do it all the time! Even with a 9.9:1 CR. Not a problem!
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Old 01-29-2004, 04:27 AM
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I always run unleaded (I believe 83 octane) in my '74 with a 2.7L CIS. I've never had any problems. I do put in a bottle of Techron every third fill-up during "driving season" (April through November).
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Old 01-29-2004, 09:54 AM
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Bruce Anderson had a little piece in Pano a few years ago about this. From what I recall, ALL 911s have valve seats that are plenty hard enough to take unleaded gas, no problem.

Same for all 914s.

I think even the later 356s were ok. You had to go back pretty far to start to get to the cars that needed leaded, and as I recall, even those would last a long time on unleaded.

Old 01-29-2004, 12:02 PM
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