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post #1 of 5 (permalink) Old Aug 21st, 00, 06:23 AM Thread Starter
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Location: mid-Missouri
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What are you guys thoughts on the different lead substitute gas additives? Do they work like they are supposed to? Which is best? In the long run, do they really "gum up" your engine like some people say? Years ago when I rebuilt this engine, you could still find leaded gas. (in Texas) I really don't want to fork out the money for new heads...
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post #2 of 5 (permalink) Old Aug 21st, 00, 08:01 AM
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Location: Buffalo NY
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Well, you really should fork over the money to have hardened seats installed on the exhaust side though. Or mix AvGas in the tank. AvGas has lead.

Gene C.
67 Chevelle SS 427/L88
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post #3 of 5 (permalink) Old Aug 21st, 00, 08:56 AM Thread Starter
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How much forkin' are we talking for hardened seats? Will my kids have to go barefoot?
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post #4 of 5 (permalink) Old Aug 21st, 00, 03:40 PM
Join Date: Aug 1998
Location: Waldorf Md. USA
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How much do you drive the car ?? If it is just a weekend, fun type car, you probably do not have to worry about it at all. Just run the unleaded fuel. We have found that as long as a motor has been run for a while with leaded fuel, the lead seems to form a coating on the valves and seats. Also the seats tend to "work" harden after a while. As long as you are not using the car for a daily driver, the motor will probably run for quite a few years without any problems.
My 71 Chevelle has had nothing but Amoco unleaded high test in it since the day I purchased it new in August of 1971...never had a problem with valve seats, then or now. Same deal with my 73 Z-28 which my brother bought new in 73. The heads have never been off and I use unleaded Amoco 93 octane. Drive it about 3000 miles a year. Granted, the 73 might have come from the factory with hardened seats, thats right about when they started using them.
I know this goes against what a lot of people say, but to be honest with you we see more valve seats killed on the newer "smog" motors than anything else. Rarely see one on an old motor, and we do heads all day !
I say forget the lead replacement and drive it.
Hope this helps,

Bill Koustenis
Advanced Automotive Machine
Waldorf Md
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post #5 of 5 (permalink) Old Aug 22nd, 00, 05:25 AM Thread Starter
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Thanks Bill! That's pretty much how I felt on the subject. I hate to admit it, but I drive the car very little. I used leaded gas for the first couple years and when they discontinued it just switched to unleaded. After that, the car was stored for a number of years. Lately I have been running a lead substitute in it solely because people swear it'll ruin your heads if you don't. I just wondered if it was absolutely necessary. Thanks for the info!

Hey 427TRI, Great looking car! If it were a 66, it would be my "dream car" since I was a kid.

[This message has been edited by mbrekke (edited 08-22-2000).]
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