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Back to the side pipes. I realize all the cars were 289's. No mystery here as they were the cars that won all the races back in the day. I think the reason for lack of FIA sidepipes is current engineering trends are usings much longer and larger diameter primary tubes which dictates undercar routing for the most part. The OEM FIA headers/collectors were very poor for torque. The primaries were only about 14" long (or less).
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Rick
As you slide down the Banister of Life, may the splinters never be pointing the wrong way 
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