Engine differences (2v, 4v?)

[Rev]

You might be referring to the heads that came stock on various 351W engines. The 4-v heads probably flowed a little better to accomodate the 4-v induction system. What exactly were you referring to?

Rev



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'66 Coupe, 306, 300 HP, C-4, 13.97 e.t., 100.3 mph
1/4 mi.