Tom, We used to do it on big blocks all the time (flat tops), but have never tried it on a small block. We were always careful not to rev it to much when the motor was cold but it seemed that the motors made more power. SC -----Original Message----- From: Tom Watters [mailto:tomwatters@xxxxxxxxxxx] Sent: Thursday, January 28, 2010 12:58 AM To: 1962to1965mopars@xxxxxxxxxx Subject: 273 Swapping Sides on Pistons Over on the A-Bodies only Board, they are talking about swapping sides on the 10.5:1 pistons on 273's. I had some confusion, but it seems to make a little sense. Dome offset isnt centered, so parts of the piston may come closer to the head in places and more gap in others. http://www.forabodiesonly.com/mopar/showthread.php?t=84332 (3/4 down the page is where part of it starts posted by Russ (Double M). Has anybody on the list done this in the past and had any real success? What are the downsides to this? Thoughts? Thanks --Tom ---- Please address private mail -- mail of interest to only one person -- directly to that person. I.e., send parts/car transactions and negotiations as well as other personal messages only to the intended recipient, not to the Clubhouse public address. This practice will protect your privacy, reduce the total volume of mail and fine tune the content signal to Mopar topic. Thanks! 1962 to 1965 Mopar Clubhouse Discussion Guidelines: http://www.1962to1965mopar.ornocar.org/mletiq.html and http://www.1962to1965mopar.ornocar.com/general_disclaimer.html.