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Old 08-08-2003, 00:24   #1 (permalink)
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Leaded to Unleaded convert on '66 Stang

Hello everyone,
I have just aquired a '66 mustang with the 289 and it is set up to run on LEADED. I do not wish to pay the 10 bucks a fill up for the additive, and was wondering what was all involved with converting it to UNLEADED fuel. I have heard i need to change the valves, valve springs, valve seats and guides, and the heads. And have also heard i need to lower compression ratio (dont know if by heads or pistons) and will see a power loss if i continue this endevor. Well i am just cerious what all is actually needed, and how much of what i know is actually true. Any help will be appreciated, and i thank you in advance.

John
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Old 08-08-2003, 00:54   #2 (permalink)
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Re: Leaded to Unleaded convert on '66 Stang

The only items you MUST change are the exhaust valves and exhaust valve seats.
It is probably a good idea however to have the guides done too, though not mandatory.
As for springs, definitely not.

You also don't HAVE to lower CR, unless you only wish to use ULP. If you want to keep CR the same, you will need to use PULP, or optimax, etc.

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Old 08-08-2003, 13:12   #3 (permalink)
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Re: Leaded to Unleaded convert on '66 Stang

Hey "SOXX" Wouldn't the "octane" of the fuel depend upon which 289 he has? The "HIPO" surely need's the best, but the 175hp could get by on less. The rest of the info was dead on.
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Old 08-08-2003, 13:29   #4 (permalink)
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How can i tell if it is the HIPO or the 175 hp engine? Thank you both for the advice, it is much appreciated. Also what do you mean by optimax and PULP, i do not want to change CR and want to try and keep it as origianal as possible, minus the parts needed for the convert.

John

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Old 08-08-2003, 13:50   #5 (permalink)
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Number 1 is that all "HIPO's" were 4bbl equiped no exception's.
2. easiest way is to look at your crank pully, it will have what look's like an add counter weight.
3. remove your valve cover's. The spring's on the "HIPO" set into pocket's
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Old 08-08-2003, 14:45   #6 (permalink)
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Re: Re: Leaded to Unleaded convert on '66 Stang

Quote:
Originally Posted by big1
Hey "SOXX" Wouldn't the "octane" of the fuel depend upon which 289 he has? The "HIPO" surely need's the best, but the 175hp could get by on less. The rest of the info was dead on.
Yes it does. That's why I said he will need to use PULP (Premium unleaded petrol), and not ULP (unleaded petrol).
Although, I've just realised he may not be from Australia and I'm not sure what fuels he may have access to.

Rick.
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Old 08-08-2003, 14:48   #7 (permalink)
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Re: Leaded to Unleaded convert on '66 Stang

Quote:
Originally Posted by Metalguy68
How can i tell if it is the HIPO or the 175 hp engine? Thank you both for the advice, it is much appreciated. Also what do you mean by optimax and PULP, i do not want to change CR and want to try and keep it as origianal as possible, minus the parts needed for the convert.
John
PULP = Premium unleaded petrol and Optimaxc is an even higher performance fuel with a higher octane.
The fact that you're not sure what these fuels are, indicate that you're not form Australia, so I'm not sure what fuel you should use.

Rick.
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Old 08-11-2003, 21:10   #8 (permalink)
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Sorry fellas, I am from America. I wasn't sure what PULP stood for. Now i know, thank you.
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Old 08-12-2003, 06:00   #9 (permalink)
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Another reason why everyone should list their location.
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Old 08-12-2003, 16:34   #10 (permalink)
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Re: Leaded to Unleaded convert on '66 Stang

What about running some heads off a 5.0 mustang that used Unleaded from new?

I'm doing something similar with my mustang.
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