original 302 do you need to put lead additive - Team Camaro Tech
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post #1 of 9 (permalink) Old Oct 10th, 02, 03:46 PM Thread Starter
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is it true that you need to put lead aditive in or you will burn up your valves and seats? i run 104 octaine boost but no lead. is this the right thing to do?
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post #2 of 9 (permalink) Old Oct 11th, 02, 12:32 AM
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It certainly wouldn't hurt.

Save your pennies, nickels, & dimes. Some day, you can pull the heads and have hardened exhaust seats installed, or buy some new alum heads. Put the originals in a garbage bag for safekeeping. Spray with lots of WD-40.

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post #3 of 9 (permalink) Old Oct 11th, 02, 05:23 AM
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I don't have first hand experience on this but, it's been posted here before. If the engine is origional and has never been taken apart for head work the seats and seals should be well protected by years of leaded gas deposits.

Use the search engine in the old tech forums and I think you'll find more information on this...

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post #4 of 9 (permalink) Old Oct 11th, 02, 05:31 AM
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I remember I used something called CDR or CDJ additive that I got at walmart. If you just did a head job without putting in hardened seats, you really need to use something until it gets some built up on the seats. After that, a little goes a long way. Better safe than sorry

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post #5 of 9 (permalink) Old Oct 11th, 02, 10:10 AM
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You'll definitely hammer the valve seats if you didn't put in hardened seats when you rebuilt the engine. You'll get about 10-15K miles out of the heads before it gets ugly. Less mileage if you have big springs!!
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post #6 of 9 (permalink) Old Oct 11th, 02, 12:26 PM
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If you run a blend of 5 gallons of leaded race fuel with premium unleaded for 2 tankfulls you will be fine. That is how I did mine. The most important thing to do is lash the valves right at .026/.026 if you are running stock rockers. I posted on this recently so take a look. That is the best way to save your heads.

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post #7 of 9 (permalink) Old Oct 12th, 02, 12:57 PM
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Just found some Bardhal stuff at the auto parts store this morning. It's called "Instead O' Lead". It cost $1.50 and says it will treat 20 gallons.

Anybody know if I should trust my 35 yr old fuelies to this stuff???
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post #8 of 9 (permalink) Old Oct 14th, 02, 07:24 AM
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If you want to protect your heads from valve seat regression, its a good idea to use one of the lead substitutes. All of the substitutes are based on either phosphorus, potassium, sodium or manganese compounds. If I remember correctly, sodium and phosphorus work a little better. I believe that Instead 'O Lead is sodium based.
Also, most of the lead substitutes have other additives like cleaners and/or octane boosters.
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post #9 of 9 (permalink) Old Oct 19th, 02, 04:29 AM
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Thanks Bowtie,

It sounds like this stuff is good, cheap insurance!!
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