Author Topic: Lead additive or not.  (Read 9608 times)

muncher

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Lead additive or not.
« on: October 05, 2010, 03:59:05 AM »
Hi All.
I have a 1967 Mustang 289. The engine has been rebuilt....not sure when. My question is should i use a lead additive when filling up. Is there a way of telling if it has the hardened valve seats....I think i know what you you will say here.
I haven't been using an additive so far and it performs great.
What do you all think?
Thanks guys.

Soaring

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Re: Lead additive or not.
« Reply #1 on: October 05, 2010, 06:20:21 AM »
It depends on how it was rebuilt, and when.  Most likely if it was a recent rebuild, it was rebuilt with hardened seats.  My original 289 has never been rebuilt, so I use an additive. 

Jeff73Mach1

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Re: Lead additive or not.
« Reply #2 on: October 05, 2010, 10:10:19 AM »
When I had a set of cleveland heads rebuilt, the builder felt that the addition of hardened seats could lead to cutting into the water jacket and decided against adding them.  His advice was to use a lead substitute every other tank of gas.  He also felt that without the additive, I would still get quite a few miles on the engine before it became an issue.

If you don't know, assume you do not have hardened valve seats.

66GTKFB

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Re: Lead additive or not.
« Reply #3 on: October 05, 2010, 10:58:48 AM »
This is another one of those car "myths". The reality is you don't need to use a lead additive in most situations on an older car that does not have hardened seats. The few times are limited to extreme strains on your engine, like towing a trailer, extensive mountain driving or racing. The recomendation from all auto manufacturers when heads are rebuilt is to have hardened seats used. In fact you will pay extra to have old type seat used as they are not easy to find. If you can find a lead additive (not a substitute), it may cause your catalytic converters to plug up. A long time ago, I used a "catalytic converter test pipe" on one of my old cars between smog checks to be able to use leaded gas. This all changed when leaded gas went away. 
Jim 

muncher

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Re: Lead additive or not.
« Reply #4 on: October 05, 2010, 08:11:57 PM »
Thanks for the replies guys. It looks like the whole engine has been rebuilt. I say that because the parts look clean also gaskits that i can see, look newish. I have no cat converter so i suppose if i use a lead additive every other tank full i should be sweet.
If i do have hardened valve seats and use the additive will it stuff up my engine?
Cheers.

Soaring

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Re: Lead additive or not.
« Reply #5 on: October 05, 2010, 08:47:40 PM »
No.  The lead additive won't harm your engine at all.  You don't have a catalytic converter to contend with. 

Jeff1967

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Re: Lead additive or not.
« Reply #6 on: October 06, 2010, 09:25:08 PM »
There are no lead additives to be found any more that I am aware of only lead substitutes here in Oregon. Are we to treat them the same by using every other tank to be safe with old style valve seats?

Thanks,

Jeff

66GTKFB

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Re: Lead additive or not.
« Reply #7 on: October 06, 2010, 09:43:43 PM »
There are no lead additives to be found any more that I am aware of only lead substitutes here in Oregon. Are we to treat them the same by using every other tank to be safe with old style valve seats?
Thanks,
Jeff

This is another one of those car "myths". The reality is you don't need to use a lead additive in most situations on an older car that does not have hardened seats. The few times are limited to extreme strains on your engine, like towing a trailer, extensive mountain driving or racing. The recomendation from all auto manufacturers when heads are rebuilt is to have hardened seats used. In fact you will pay extra to have old type seat used as they are not easy to find. If you can find a lead additive (not a substitute), it may cause your catalytic converters to plug up. A long time ago, I used a "catalytic converter test pipe" on one of my old cars between smog checks to be able to use leaded gas. This all changed when leaded gas went away. 
Jim 
If you don't put a "strain" on your engine, save your money and buy a six pack.
Jim

Soaring

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Re: Lead additive or not.
« Reply #8 on: October 07, 2010, 03:47:22 AM »
I don't know of a lead additive, but what I use is a lead subsititute.  Readline is the brand I use, and my old 289 runs like a scared rabbit.  I get on mine ocassionally, so run it hard.  I don't have any pinging or clatter. 

Jeff1967

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Re: Lead additive or not.
« Reply #9 on: October 07, 2010, 08:50:12 AM »
Thanks guys,

Lead additives I assume are no longer available. Maybe I will use a substitute on road trips if putting a lot of miles on the car especially traveling over mountain passes.

Soaring

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Re: Lead additive or not.
« Reply #10 on: October 07, 2010, 04:02:11 PM »
That's what I would do.  Like I said, you can't hurt the engine by using a substitute. 
But, you may burn the valves under stress if you don't use it.  I use about a third of a bottle on each 2nd fill-up.  Just listen to your engine to determine the need. 

thundertc64

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Re: Lead additive or not.
« Reply #11 on: December 12, 2010, 12:25:18 PM »
Under normal driving conditions there is not much wear and damage done, BUT, There is wear occurring to non hardened valve seats without the lead in gasoline,thats why the lead was put into gas in the first place, plain and simple. the more strain put on an engine just pounds the seats worse such as drag racing and the like. Summit racing has the lead additive you are looking for and is very cheap, and is recommended 2 ounces to every ten gallons of gas depending on driving habits. My 73 Mach has a 69 351 with 11:1 compression ratio so high octane and lead additive is a must for mine. If i try to run it without either i can notice a big difference. but all goes to driving habits 

 

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