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Old 06-10-2011, 07:06 AM
greenmeanie greenmeanie is offline
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Question gas?

First of all, thank all of you for your great advice!!!

I'm a new Chevelle owner(1970) and I'm about due for my first tank of fresh gas. Is it better to use lower or higher octane?

I also know that I need a lead substutute additive.

-GM
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Old 06-10-2011, 07:58 AM
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Hank70SS Hank70SS is offline
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This is your 3rd post asking about your 1970 Chevelle but you still haven't told us anything about your car. To give you good advice you need to tell us a little about it, like what engine is in it. Is it still 1970 stock or has it been rebuilt, modified, replaced? Some of the questions you ask just don't have a 'one size fits all' answer.

In general you would probably need to run a higher octane gas but again, that may not be true for your particular engine. Lead additive, don't really believe it's needed. Some will say if it's a stock 70 engine you need it but there are a lot of stock engines running fine without it.

A higher octane gas will let you run more timing advance. That can help with performance, fuel mileage and it will run cooler. Do you need a higher octane? Can't answer that, don't know anything about the engine or how the timing is set now. To be safe I would say use premium so you don't risk pinging, detonation which can ruin an engine.
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Old 06-10-2011, 08:03 AM
Czeto Czeto is offline
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The highest octane you can find (I use Shell). I also use Red Line Lead substitute (the good stuff is not made anymore) and a fuel treatment for ethanol. I think the increase in ethanol is more of a problem than the lack of lead.
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Old 06-10-2011, 11:06 AM
greenmeanie greenmeanie is offline
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Thank you for all of your help!! I have a 1970 Chevelle 307 automatic.
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Old 06-10-2011, 06:37 PM
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Mike 1972SS Mike 1972SS is offline
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Quote:
Originally Posted by greenmeanie View Post
Thank you for all of your help!! I have a 1970 Chevelle 307 automatic.
If the engine is relatively stock, then it's compression ratio is approximately 8.5-9.0:1 which should run fine with the lower octane fuel at stock timing.

Mike
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Old 06-10-2011, 07:04 PM
grandsport grandsport is offline
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Hi green.
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