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Message: <blockquote data-quote="Dave70968" data-source="post: 3101477" data-attributes="member: 13624"><p>So, reading the first link, in particular about small-base-circle cams.  I understand their advantages (or at least I think I do).  I understand the danger of the lifter falling below the dogbone.  It seems like that could be fixed with a slightly taller lifter, though I can see where that could be a problem in that it would add mass to the pushrod stack (the linked lifters make for a clever solution).  Aside from keeping the lifter from falling below the dogbone, are there any other advantages to a larger base circle in the cam?  Other than simplicity and insensitivity to rotation, are there other advantages to non-roller (am I using "flat-tappet" correctly?) lifters?  Other than (I'm guessing) cost, is there any downside to forged pistons?</p></blockquote><p></p>