Tom in Missouri wrote:

> All the good stuff disappeared 20-25 years ago because of EPA regulations.
> The lead you get is so miniscule that nothing happens except the seller gets
> rich.
>
> You will be dollars ahead to simply locate some real higher octane racing
> fuel and mix a bit of it even at the $5, $6, or $7 a gallon it will run. If
> I remember right, I think you said once you were in NJ. With Flemington
> Racetrack and Englishtown basically in distance to most, there have to be
> some racers around who can tell you where to find racing gas or could
> probably be talked into hauling you back 5 or 10 gallons from their weekend
> at the track.
>
> A gallon of 114 leaded racing will bring 10 gallons of 94 up to roughly 96
> octane.
>
> That is more than adequate for your 427 if it is stock. The octane
> requirements in your owners book are Research numbers. Today's octane is
> R+M, which is the average of Research and Motor combined. So if the gas was
> 87 Motor and 93 Research, you'd have 90 R+M today. So 94 R+M that you are
> using is equivalent to around 97 Research. Unless you are running the 12.5
> to 1 engine, you should be fine on 97 Research.
>
> If you are getting pinging, then likely the ignition is not set right. That
> is not just the initial timing, but the entire curve. Check your total
> timing, how the curve comes in, and so on.
>
> Lead is highly overrated.
>
> In the typical lead-era small block and big block, if it would go 100,000
> miles before having to do a valve job, then it will go roughly 75-80,000 on
> the unlead, based on stock spring pressures and proper valve adjustment.
> Wrong springs and too loose of adjustment will destroy the heads much faster
> than no lead.
>
> How long will it take you to put 75,000 miles on your Corvette?
>
>
> "Barking Rats" > wrote in message
> ...
>
>>In article .com>,
" > wrote:
>>
>>
>>>95% of Octane Booster is just snake oil.
>>>It won't hurt anything but your pocketbook.
>>
>>Is this a personal opinion or can you cite any reference material I
>>might be able to look at?
>>
>>As I mentioned, I'm not after the boost as much as the lead substitution
>>and fuel stabilization qualities. 94 octane unleaded seems to do OK in
>>my 427 - though i don't get my foot in it very hard, very often.
>>
>>Here's waving to ya - \||||
>>
>>Owen
>>___
>>
>>'67BB & '72BB
>>
>>-- not affiliated with JLA forum in any way -- alt.autos.corvette is
>>original posting --
>>___
>>
>>"To know the world intimately is the beginning of caring."
>> -- Ann Hayman Zwinger
>
>
>
Hi Tom,
I switched to unleaded and had "vanishing lash" from seat
recession in a 914-6 daily driver (aluminum heads with ferrous
seats--not stellite though). Was measurable on two valve lash
adjustments over about 12,000 miles (when we pulled the heads). Had
the heads reworked with hardened valve seats--then no problem.
Agree though that cast iron heads and hydraulic lifters should
help minimize the problem.
Cam grind is also a player along with spring tension.
PJ