Try again. The knock you're hearing when an engine pings is 2 flame fronts colliding. One being set off from a hot spot like a glowing piece of carbon, the other from the spark plug. Octane has no effect on burn time. Clean out the EGR passages of that 460 and she won't ping on 87. Thats one of the benefits of EGR. That old 460 only has an EGR valve position sensor and can't actually tell if there is enough flow.
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Today's Featured Article - Fasteners: The Nuts and Bolts of Nuts and Bolts - by Curtis Von Fange. The nuts and bolts of nuts and bolts is an interesting and essential piece of knowledge that applies to our older tractors. An improperly torqued capscrew on an engine head or a shear bolt that is too hard on the driving shaft of a bushog can create havoc and make an expensive and uncalled for repair. Let�s examine the purpose and design of these fasteners in order to ensure their proper use. Fasteners are probably one of the aspects of mechanics that is given the least amount of thought.
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