Leaded gas |
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Rivercrest
Member Joined: 07-December-2019 Location: Manitoba Canada Status: Offline Points: 175 |
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Posted: 06-September-2021 at 5:28PM |
Anyone have thoughts or suggestions when it comes to using unleaded fuel in a 72 351C. I was able to buy a lead additive but the supplier is no longer making this item. Proper lubrication is the concern........ Thanks
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Bob
1974 Cougar XR7 with a 72 351C |
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californiajohnny
Moderator Group Joined: 05-October-2013 Location: winlock, wa Status: Offline Points: 14606 |
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lead was to lube the exhaust valve seats, putting in hardened seats will cure that. running unleaded won't cause damage right away but over a long time eventually the valves can sink at which point you'll need to rebuild the heads and install hardened seats ...
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JOHN
74 GRAN TORINO S&H CLONE 74 VETTE CUSTOM 90 S10 BLAZER 4X4 LIFTED 77 CELICA CUSTOM 75 V8 MONZA SUPERCHARGED 79 COURIER VERT. SLAMMED 75 VEGA V6 5 SPD 70 CHEV C10 P/U 68 MUSTANG FB CONVERSION |
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Rivercrest
Member Joined: 07-December-2019 Location: Manitoba Canada Status: Offline Points: 175 |
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Thanks for that, it's appreciated.
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Bob
1974 Cougar XR7 with a 72 351C |
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72FordGTS
Admin Group GTS.org Admin Joined: 06-September-2005 Location: Ontario, Canada Status: Offline Points: 5802 |
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1972 Ford engines were designed for low lead fuel, so I am not sure of they had the hardened exhaust seats yet. Rockatansky might know. What I do know is that my 1972 400, which uses essentially the same heads as your 351-2V, ran unleaded for decades and to 150,000 miles without any ill effects.
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Vince
1972 Ford GTS Sportsroof - Survivor, One Family car GTS.org Admin |
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lynchster
Senior Member Joined: 07-January-2006 Location: Pennsylvania Status: Offline Points: 2150 |
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They used a "hardening" process on the heads but no valve seats at the time.
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Chuck
72 Gran Torino Sport 13 Taurus SHO "Mr Pig" |
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Rivercrest
Member Joined: 07-December-2019 Location: Manitoba Canada Status: Offline Points: 175 |
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All good information, thanks again to all who replied.
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Bob
1974 Cougar XR7 with a 72 351C |
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Rockatansky
Senior Member Joined: 30-July-2010 Location: On The Road Status: Offline Points: 6059 |
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i read somewhere that at some point an induction hardening process was used and those seats tended to crack. consider that the original seats are likely work hardened by now and may last a good long time. also consider that TEL was added as an anti-knock agent, it lubricating and cushioning effect on valves and seats may be an old wives tale?
https://en.wikipedia.org/wiki/Tetraethyllead |
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72 GT Ute
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Big Bird
Senior Member Joined: 25-August-2013 Location: New York Status: Offline Points: 4194 |
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Got a moron to put about a dozen deer slugs in his gas tank to "Make up for the lead" back in the day.
(Just the slug, not the shell/powder). He actually pulled them apart and put them in his Monte Carlo's tank. Good Times...
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"What we do in full frontal view, is more honest than your cleaned-up mind."
Randy 1979 T-Bird 2005 F-150 STX RCSB 4.6, 3.55 LSD How the Heck does a REGULAR CAB SHORTBED weigh over 5200 pounds? |
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Rivercrest
Member Joined: 07-December-2019 Location: Manitoba Canada Status: Offline Points: 175 |
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maybe some used leaded fishing weights too......LOL LOL LOL
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Bob
1974 Cougar XR7 with a 72 351C |
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Rockatansky
Senior Member Joined: 30-July-2010 Location: On The Road Status: Offline Points: 6059 |
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72 GT Ute
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