I think the flat 6 is intrinsically well balanced like the I6. 60 degree V6 (like Duratec) better balanced than 90 V6 (like GM pushrod 3.8) or V8 (90 degree best here) or I4/flat 4. I think a V12 or flat 12 is well balanced as well..
1999 Amazon Green SVT Contour (#554/2760)
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