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Thread: Unleaded gas - classic pre-unleaded engines

  1. #1
    Administrator SVT10th's Avatar
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    Unleaded gas - classic pre-unleaded engines

    So -- you guys with classic Mustangs from the pre-unleaded era...

    Do you have to do anything special to run unleaded gas without damaging the valves, etc in your engines? It used to be that people would add lead additives to their gas, but I'm not even sure you can get that any more.

    Or is it kind of a non-issue now....


    Reason I ask... well, if I was was to say... Sell the Cobra and buy a 69 Mach... is it something I need to know about?
    ---
    Jim

    1990 Twilight Blue Mustang GT Convertible

    GT40 Tubular upper and lower intake, GT40 heads, Trickflow Stage One cam,
    BBK 70mm Throttle Body, 24lb Injectors, Silver Fox Transmission AOD SPT-1 Valve Body,
    Headers, O/R H pipe, Flowmasters.
    Dyno July 2016 - 253 RWHP / 293 RWTQ

    Also in the stable:
    2013 Cayenne Red Nissan Altima SL 3.5
    Sold (2015): Black 10th Anniversary Cobra #353

  2. #2
    Moderator ToplessPony94's Avatar
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    FWIW, I saw the lead additive at Advance Auto Parts last time I was at cruise night.
    Bruce
    TFS TW heads, rockers, 75mm intake, cam, 75mm TB, CAI, MAF, DeatschWerks 35# injectors, Aeromotive rails/regulator, 255 pump, BeCool rad, alum water pump, MSD 6A/coil, alum flywheel, PP, driveshaft, McLeod clutch, Torsen T2R, 3.73, 31spline axles, 17" 95 Cobra R, NT-05 255/275, MM CC plates, coil-over (Bilstein), rlca, K-brace, A-arms, SF conns, Cobra brakes, =len shorties, 2.5" SS Hpipe, Borla CB...

  3. #3
    Senior Member LILBLKSNAKE's Avatar
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    Just stop by NED for leaded race fuel

    1994 GT Convertible
    1997 COBRA **SOLD**
    2003 GT Convertible
    2013 Mustang GT 5.0 **SOLD**
    2017 F150 Lariat Luxury FX4

  4. #4
    Administrator SVT10th's Avatar
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    Quote Originally Posted by ToplessPony94 View Post
    FWIW, I saw the lead additive at Advance Auto Parts last time I was at cruise night.
    Really? I'm amazed that the tree-huggers haven't gotten it outlawed by now. (It IS pretty nasty stuff)

    Quote Originally Posted by LILBLKSNAKE View Post
    Just stop by NED for leaded race fuel
    yeah. I'm gonna drive 30 miles to get a tank of gas.


    How about Todd and George, you guys must have some insight, since you actually drive cars with engines designed for lead.
    Last edited by SVT10th; 07-25-2014 at 01:44 PM.
    ---
    Jim

    1990 Twilight Blue Mustang GT Convertible

    GT40 Tubular upper and lower intake, GT40 heads, Trickflow Stage One cam,
    BBK 70mm Throttle Body, 24lb Injectors, Silver Fox Transmission AOD SPT-1 Valve Body,
    Headers, O/R H pipe, Flowmasters.
    Dyno July 2016 - 253 RWHP / 293 RWTQ

    Also in the stable:
    2013 Cayenne Red Nissan Altima SL 3.5
    Sold (2015): Black 10th Anniversary Cobra #353

  5. #5
    Moderator ToplessPony94's Avatar
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    Quote Originally Posted by SVT10th View Post
    Really? I'm amazed that the tree-huggers haven't gotten it outlawed by now. (It IS pretty nasty stuff)
    You can still get things with 2-cycle engines, too!
    Bruce
    TFS TW heads, rockers, 75mm intake, cam, 75mm TB, CAI, MAF, DeatschWerks 35# injectors, Aeromotive rails/regulator, 255 pump, BeCool rad, alum water pump, MSD 6A/coil, alum flywheel, PP, driveshaft, McLeod clutch, Torsen T2R, 3.73, 31spline axles, 17" 95 Cobra R, NT-05 255/275, MM CC plates, coil-over (Bilstein), rlca, K-brace, A-arms, SF conns, Cobra brakes, =len shorties, 2.5" SS Hpipe, Borla CB...

  6. #6
    Senior Member chachee52's Avatar
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    I was told that you have to replace something on the pistons (or something like that) to run the unleaded. I just run unleaded now, no additives. I was told mine was replaced but knowing my luck it's still original and I've totally screwed up the engine and it shouldn't be running now. (just like everything else on my car)
    Growing older but not UP

    My car now has a heater, and now has HEAT!!

  7. #7
    Senior Member 390gtconv's Avatar
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    The issue with "classic cars" and unleaded fuel is the valves. In the old days "regular" gas had the lead in it to help lubricate the valves. So when folks have their old engines rebuilt, shops install "harden" valve seats to handle todays unleaded fuel.
    Now it's been said in articles and on classic car forums such as: http://forums.vintage-mustang.com/ that as long as you are doing gentle cruzing and not hard driving or towing, classic cars (think early '70 and older) you'd be ok.
    But if you wanna just upgrade, pull heads, have valve job done, all set.

  8. #8
    Senior Member fredfordguy's Avatar
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    I had hardened seats put in when the engine was built some 30 years ago, no probs.....

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