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quick follow up
Thank you for the compliment, I am here to learn and share info so we can all better our mileage.
I measured the header this morning when I got home from work because it was on my mind. The tube is slightly oval shaped and measures approximately 1.25" by 1.5" with my caliper.
If you use the calculator mcrews suggested between 1.25" and 1.5" is large enough to flow ALL 62 HP and would be large enough properly exhaust the capacity of the complete engine. When/if I build a new set I will likely use 3/4" primaries tubes. I haven't calculated the length yet but will be longer than these ebay junk.
Good day/night to all. Dave
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