Posted by rustyfarmall on August 30, 2016 at 14:02:14 from (208.126.186.41):
In Reply to: Revisited 68 Chevy posted by Tom in Mo. on August 29, 2016 at 18:55:47:
If I remember correctly, the 307 was Chevy's attempt to conform to new EPA regulations. 1968 was the beginning of the emmisions thing, and new vehicles had to perform satisfactorily on lower octane gasoline. This meant that compression ratios had to be reduced to prevent pinging and knocking. The tried and true 283 c.i. just couldn't deliver with those reduced compression ratios, so the 307 was developed. Had to increase the bore to make up for the lower performance of the reduced compression. Did it work? Well, the EPA was happy, but at the same time a well tuned 283 could easily run circles around the 307 and get better gas mileage while doing it.
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