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leaded or not

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bdavis View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote bdavis Quote  Post ReplyReply Direct Link To This Post Topic: leaded or not
    Posted: 13-May-2011 at 4:13PM
A friend of mine asked what year ford swapped the fuel type from leaded to unleaded for the 351c 4v and I didnt know when either.  When was it?
-Ben

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Post Options Post Options   Thanks (0) Thanks(0)   Quote 75GranMan Quote  Post ReplyReply Direct Link To This Post Posted: 17-July-2011 at 3:00PM
I believe the Q code was available in 74 model ,which was leaded fuel.they went to unleaded fuel in the model year 75,but the 351 4v was not available for that year,so the Q code was only a leaded fuel engine.unless someone knows different.
John 75Gran Torino 4spd
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Post Options Post Options   Thanks (0) Thanks(0)   Quote lynchster Quote  Post ReplyReply Direct Link To This Post Posted: 17-July-2011 at 3:08PM
None of the 351C's were set to run on unleaded fuel in the US. Australia? Used the Cleveland until 1982 I believe.
 
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Guests Quote  Post ReplyReply Direct Link To This Post Posted: 17-July-2011 at 3:35PM
I have a 1974 351C 2v that was in a Ranchero 500 and it was a leaded fuel engine.I ran lead substitute in every tank fullBthen I moved to Arizona in 1992 and they still had leaded fuel thereN~hen I moved back I ran lead additive again as only unleaded was available.you have to take the heads to machine shop and have hardened valve seats installed to run the unleaded fuel in a motor pre 75.It will run but in time will do damage to the heads
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Post Options Post Options   Thanks (0) Thanks(0)   Quote occupant Quote  Post ReplyReply Direct Link To This Post Posted: 17-July-2011 at 4:38PM
A lot of people say you MUST have the hardened valve seats. If you're racing, towing a trailer, hauling heavy loads, sure, by all means, go get the head work done. If you don't have constant heavy use like that, it's not a problem. If someone put hardened seats in my '72 351C that's 10K into a rebuild, fine. If not, fine. I won't be pulling an Airstream anyway.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote stanman Quote  Post ReplyReply Direct Link To This Post Posted: 17-July-2011 at 4:54PM
I can't lay my hands on it right now, but I have an article from an old Popular Mechanics or similar from 1971 telling about the new 1972 Torino's. It said the 351C 4V heads had hardened valve seats.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote GranTorinoSport Quote  Post ReplyReply Direct Link To This Post Posted: 19-July-2011 at 8:03PM
I know my 71 F-250 heads did not have hardened seats in them - the unleaded fuel cupped the exhaust valve seats in about 30,000 miles. There were a ton of other problems with the heads, but certainly that did not help the situation.

A complete head job which included new valves, hardened exhaust seats (only ones to worry about) and valve guides (and other extras) was just under $1100 at a very good machine shop. They were new heads at that time (4 months ago).
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Guests Quote  Post ReplyReply Direct Link To This Post Posted: 20-July-2011 at 6:13AM
yes the exhaust seats are really the only ones need to have the hardened seats installed but you bet on my 69 429 I will have it done as I am gonna rebuild the whole motor and do performance mods so as the heads will already be having a valve job the seats will get done.
Not worth burning up a set of heads.I don't know if they make that lead substitute additive anymore but I used it back in the early 90's when I ran unleaded in my Torino with a 74 351C 2v with 4bbl Carter AFB,Edelbrock Performer intake and Erson 290 duration cam as I was not taking a chance on ruining my heads
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 73GTS Quote  Post ReplyReply Direct Link To This Post Posted: 22-July-2011 at 8:58AM

Just run AV gas. It has lead in it.Thumbs Up

Jim


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Post Options Post Options   Thanks (0) Thanks(0)   Quote Rockatansky Quote  Post ReplyReply Direct Link To This Post Posted: 23-July-2011 at 12:24PM
when unleaded first came out there was a problem but i'm pretty sure they have something in the  fuel now to help the valve seats, probably been changed several times since 
 
the 351C became the Q-code in 1971, prior to that the Q-code was a different engine
 
 
the Gasoline wiki says legislation began in 1973, but here
they're saying that Amoco always sold unleaded? called White Gas
72 GT Ute
   
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