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1" primaries may be too big. Looking at the amount of exhaust coming out in comparison to a 350 SBC...
43.75 CID/primary. Usual* header primaries are 1.625" for street headers, 1.5" are rarer but would push the torque peak down lower.
Metro 1.0 has 0.33 CID/primary, a 24.6% reduction in exhaust gas volume.
1.5" x .754 = 1.131" primaries.
I stand corrected! Now I don't know if you can directly compare like this. The size I came up with seems to show that 1" is the way to go if this math checks out okay!
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