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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
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| | | | Joined: Nov 2005 Posts: 1,048 'Bolter | | 'Bolter Joined: Nov 2005 Posts: 1,048 | Dave:
It is interesting that you have referred to “today’s fuels” in your note. I’m wondering what the difference is between gasoline of the 40’s & 50’s and the gasoline of today.
I’m thinking that it is essentially the octane rating that should affect the timing and spark knock (pre-ignition). Was the octane rating of the older gasoline’s lower or higher than today’s? I remember something about the older fuels being measured by one method and, I think, modern gasoline octane rating is an average of the old method and a newer method all if which rates today’s gasoline at a higher octane that it would have been rated in the 40’s.
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