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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Today's Featured Article - George's Fordson Major - by Anthony West (UK). This is a bit of a technical info to add on to the article about George's Major in the "A Towny Goes Plowing" article. George bought his Major from a an implement sale about 18 years ago for £200.00. There is no known history regarding its origins or what service it had done, but the following work was undertaken by Harold alone to bring it up to show standard. From the engine number, it was found that the major was produced late 19
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