10 thousandths over pistons are not really "custom", just not normally stocked on the shelf. They can be made to order by any of the name brand manufacturers, just involves a bit more time to receive your parts.
An engine builder who will supply parts & info to make sure your build goes properly is Mark McKeown at MME, http://mmeracing.com
When you block a person, they can no longer invite you to a private message or post to your profile wall. Replies and comments they make will be collapsed/hidden by default. Finally, you'll never receive email notifications about content they create or likes they designate for your content.
Note: if you proceed, you will no longer be following .