Boys I need some guidance here. This has to do with ULH cylinders. Are 74 and 80 cube cylinders the same with one being bored larger or are they different cylinders? I read Bruce’s paragraph on this subject but obviously I’m missing something. Thanks guys, Bob L
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Originally posted by Robert Luland View PostThanks Jerry but what do you mean relieved around the valve. I'm not retarted, just slow.Be sure to visit;
http://www.vintageamericanmotorcycles.com/main.php
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The 13 fin cylinders have 120-37 and 120-371 cast in the front/rear base flanges. They will be used on the 1937 Big Twin flatheads and the 1938-41 ULH models. The 11 fin cylinders have 120-38 and 120-381 cast in the front/rear base flanges, and were used on the 1938-48 74 cubic inch flatheads.Last edited by Steve Slocombe; 03-30-2012, 04:21 AM.
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