Hi:<br /><br />I just listed my 1956 Mark 20H racing motor on ebay and I got a question from someone who may be interested. He specifically wondered if the serial number on the block matches the serial number on the tag. Where is the s/n located on the block for this motor. I checked my merc 110 and the s/n is stamped on the block by the exhaust cover. What about the Mark 20H?<br /><br />Oh yeah - and if any of you are interested yourself, have a look:<br /><br /> http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&category=310&item=7154877478&rd=1&ssPageName=WDVW <br /><br />Thanks in advance for your replies.