Not Ranked
Fred,
Not necessarily a ye wise man but, if you want to go square with a Dart block why not a 447 (4.155 x 4.125)? I stay at 434cid (4" stroke) since efficiency and reliability are already compromised with the 434 combination. When over 400cid, the 4.030 bore isn't really an option by my way of thinking, for efficiency reasons.
Scott
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