Re: Grand sport (1963) race car headers
The only thing that's arguable is the point the exhaust valve opens as it takes some time and crank angle for the blowdown wave to fully form and it is fairly long, but I think 34" is a good number for current vintage racing engines that are similar to the circa 1970 Trans-Am engines.
If one had the luxury of having sufficient resources to have multiple header sets one could be fabbed for short, tight tracks and one for big tracks with long straights. The former might be slightly longer with slightly smaller OD tubing than the latter to enhance the mid range since if you can get out of a corner quicker than a competitor onto a fairly short straight you will usually win the drag race to the next brake point.
Duke
The only thing that's arguable is the point the exhaust valve opens as it takes some time and crank angle for the blowdown wave to fully form and it is fairly long, but I think 34" is a good number for current vintage racing engines that are similar to the circa 1970 Trans-Am engines.
If one had the luxury of having sufficient resources to have multiple header sets one could be fabbed for short, tight tracks and one for big tracks with long straights. The former might be slightly longer with slightly smaller OD tubing than the latter to enhance the mid range since if you can get out of a corner quicker than a competitor onto a fairly short straight you will usually win the drag race to the next brake point.
Duke
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