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06-27-2007, 11:41 AM
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#1 |
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Junior Member
Join Date: Mar 2007
Location: Hideaway, TX
Posts: 4,950
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Leaded or Unleaded
I bought a 69 about a month ago and need to know what to do reguarding gas. It has the original motor set up for leaded gas. Will running unleaded damage the valves/heads? I never thought about it before I bought the truck.
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71 Suburban 350/700R4 Project Trixie 72 CHEVY,Highlander,SWB,396,T400 |
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06-27-2007, 11:45 AM
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#2 |
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Registered User
 
Join Date: Oct 2005
Location: Sacramento, CA
Posts: 1,970
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Re: Leaded or Unleaded
Need hardened valve seats. The lack of lead in todays gas will help destroy the valve seats in heads not designed for unleaded fuels. It's a gradual deteriation of the seat, not an overnight thing.
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72 Cheyenne SWB Fleet Nut & bolt frame off in progress...99.9999% - supercharged 383 - 4 wheel discs - relocated fuel tank -  My Build Thread |
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06-27-2007, 12:03 PM
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#3 |
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Senior Member
Join Date: Dec 2006
Location: Studio City, Calif.
Posts: 2,861
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Re: Leaded or Unleaded
Last I heard,they still sell an additive that may help prevent this damage. "Instead-a-lead" or something like that.
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'69 GMC C2500 Custom Camper, 8 1/2' bed, New GM 350, NP 435 Close Ratio 4spd. Trans., 3.73 Dana-60 open.Camper and Trailer wiring, PS, PB, AC, tach , three gas tanks, 2nd owner, Work-Truck supreme. Best $300 I ever spent. |
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06-27-2007, 12:46 PM
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#4 |
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Registered User
Join Date: Aug 2003
Location: MN
Posts: 380
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Re: Leaded or Unleaded
Yeah they still have it in the auto parts stores. A quart of it treats something like a couple hundred gallons, IIRC. When I tore down my original 72 350 the valve seats were destroyed from the previous owner running unleaded.
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1972 C10 1972 C20 
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