Re: Higher octane??

Try slowing down the advance in the dist. Make sure it is not advancing to far. You may have to shorten up the slots. Retarding the cam will close the intake valve later and bleed off some cylinder pressure. Pinging under light acceration can do adjusted by the vacuum advance with an allen wrench.

From: Jacob Fox <imfast101@xxxxxxxxx>
To: "1962to1965mopars@xxxxxxxxxxxxxxxx" <1962to1965mopars@xxxxxxxxxxxxxxxx>
Sent: Sunday, November 20, 2011 11:24 AM
Subject: Re: Higher octane??

In my manual my 383 needs high octane. I still don't understand why I have so much pinging when I punch the accelerator. I've tried timing, I made sure my advance was working by watching timing with advance hooked up I run the high octane idk what else to do! Lol

Sent from my iPhone

On Nov 20, 2011, at 8:06 AM, "Gary H." <62to65mopar@xxxxxxxxxxx> wrote:

> Any pinging or spark knock?
>
> >From a BP document: Increased octane does not increase power.
>
> Higher compression and improved engine breathing will increase power.
> These modifications may lead to detonation or combustion knock which is
> then eliminated by using fuel with a higher octane.
> www.powerchipgroup.com/articles/PET0605.pdf
>
> Thanks,
> Gary H.
>
>
>> -------Original Message-------
>>
>> Now I think know the answer to this question, but I'm gonna ask it any
>> way. Should I be running higher octane gas in my 440? It's a 1970 engine
>> with a bit of a cam, new rings, and stock heads with high rise exhaust
>> manifiolds. It's in my 65 Polara. ...
>
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