Thunder Tiger 40?
<span style="font-family: Comic Sans MS"><span style="font-size: medium">It has come to my attention that <span class="squiggly" title="To see spelling suggestions, click this word" splc="splc" state="new" word="Hobico">Hobico</span> has been shipping <span class="squiggly" title="To see spelling suggestions, click this word" splc="splc" state="new" word="TT">TT</span> 40 Pro engines with 46 crank, piston, sleeve, and heads.
The case says it's a 40 as well as the box but they are not. This might not be a big deal to you unless you are racing in AMA 424 or Club 40 class.
The first tip off is if a quarter will fit between the head and case you may have a 46.
The stroke and bore are about <span class="squiggly" title="To see spelling suggestions, click this word" splc="splc" state="new" word="1mm">1mm</span> larger on the 46.
If you have one please call <span class="squiggly" title="To see spelling suggestions, click this word" splc="splc" state="new" word="Hobico">Hobico</span> and let them know it.
These will likely be engines purchased with in the last year...</span></span>