well, a brand new rebuild will need to "wear in" a bit. You have also increased (probably) the compression with the new rings and valve job. new rebuilds are always "tight".
Now, you could have a bearing cleance issue. Did you install the pistons in the correct orientation? Are the main caps installed with the correct orientation? Did you use assembly lube or oil when you assembled?
There could be a number of things "wrong" or it could just be "new, tight".
I don't know your level of experience or background, so please don't be offended by my questions.
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Today's Featured Article - Fabrication (Who Me? Make it myself?) - by Chris Pratt. First of all, what are the reasons for not fabricatin your own parts? Most judgements on what should be purchased rather than fabricated stem from: Originality - If the tractor restoration is to be 100% original, it is likely that you should spend the time and money to locate the component in the used or New-old-stock market. Since this can be extremely difficult, you may want to fabricate the item or purchase a modern replacement temporarily, but eventually, you s
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