That surprises me about the Mark I 348/409. As I recall, the whole idea for what ultimately became the trimmed down Mark IV big blocks was to cut the weight down from the Mark I so could have big block power in Corvettes to go up against big Fords and Chryslers without messing up the 55/45 front to rear weight ratios for handling too much. The Mark IV changed it to 60/40, as I recall, and the Mark I was going to pretty much not make it a handling car at all because of its weight.
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Today's Featured Article - The Nuts and Bolts of Fasteners - Part 2 - by Curtis Von Fange. In our previous article we discussed capscrews, bolts, and nuts along with their relative hardness and thread sizes. In this segment we will finish up on our fasteners and then work with ways to keep them from loosening up in the field. Capscrews, bolts and nuts are not the only means of holding two parts together. When dealing with thinner metals like sheet tin, a long bolt and
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