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Old motor with today's gas

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Old motor with today's gas

Post by puddin head on January 14th 2013, 12:48 am

I have this 66' Falcon wagon with a 289 and C4. I plan on using this as a daily driver as well as some long trips. It is the original engine and no hardened valve seats. From what I have read, is that there isn't a need to have new seats if the motor is not ran hard like racing. I will be doing some long hauls this year and don't need any problems. So, what do you people think?
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Re: Old motor with today's gas

Post by Reb Stew on January 14th 2013, 1:41 am

Run it. If it breaks fix it. Very Happy

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Re: Old motor with today's gas

Post by Arieldouglas on January 14th 2013, 3:04 am

I know several people running leaded gas engines on unleaded with no noticeable problems. If you are really concerned, you can get additives to replace the lead.
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Re: Old motor with today's gas

Post by Reb Stew on January 14th 2013, 3:07 am

While your at it toss in a can of Zinc in the oil. Nothing is as it use to be.

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Re: Old motor with today's gas

Post by puddin head on January 14th 2013, 5:24 am

Not really worried about it. Just don't want to be like in Little Rock and have a valve issue, but I don't expect to. A guy in the Falcon club has a 66' Ranchero and he is tearing his down to have hardened seats put in. I told him I didn't think he needed to. Just spending money on something he didn't need.
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Re: Old motor with today's gas

Post by dieseldr on January 15th 2013, 1:45 am

Most old engines don't run enough miles to be an issue. But if in doubt, add a can of fake lead twice a year, pretty cheap, won't hurt it any. My .02 worth. This problem is seriously overrated, but if you have something rare and worn out, might as well have the hard seats put in if the old ones are ground down in deep. Having a 428 CJ done- it will see some hard use, and the exhaust seats had been ground numerous times, and were quite deep thanks to "race springs" with 180#seated pressure. New springs are @ 115# seated.
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Re: Old motor with today's gas

Post by puddin head on January 20th 2013, 10:50 pm

So what is everyone's thought on this. Run it or change it?
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Re: Old motor with today's gas

Post by dieseldr on January 21st 2013, 12:56 am

My .02-

It is darned near impossible to kill a 289 with catastrophic failure, I doubt you need to concern yourself with the slooooowwwwwww effects of unleaded fuel with leaded valves. I say run it! (If it's running good now)
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Re: Old motor with today's gas

Post by 911TAZZ on January 21st 2013, 12:59 am

I'd run it. As long as you're not beating on it much I don't see it being a problem
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Re: Old motor with today's gas

Post by falconwagon62 on January 21st 2013, 1:03 am

junk it, give it to me.....lol
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Re: Old motor with today's gas

Post by puddin head on January 21st 2013, 1:06 am

I've got a 5.0 in my brothers barn as a backup. Haven't been into it, but John said it was good!
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Re: Old motor with today's gas

Post by Brownie on January 21st 2013, 1:37 am

I agree with the rest. Run it I dout you have any problems out of it. For that reason anyway.
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Re: Old motor with today's gas

Post by dieseldr on January 21st 2013, 3:01 am

Thinking about it another way, you will probably see more damage from zinc deficient motor oil in this engine over time than you will see damage from unleaded gas. This comment will make a "lubritorial engineer" cuss!
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Re: Old motor with today's gas

Post by junkyardjeff on January 26th 2013, 4:19 pm

If you ever decide to tow a camper or trailer long distance I would go with hardened seats but just normal driving should be ok.

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