Ok hope I am not opening a can of dead worms here, but will tell what I was told many years ago....... to reduce rotating friction, turn your pistons 180 degrees when installing them,,,,,,,,,,,,,supposedly the story goes like this,,,,,,,,,the pin in the piston is not dead center, and is designed to create a very minimal amount of bind when at top dead center of the stroke,,,,,this is done so as to eliminate piston rattle when the piston is in the process of changing direction at end of stroke.......... the article that I read on this also said that the engine would be noisy compared to the stock build, but would not cause harm,,,,,,,if someone is interested I will try to find the article and post it,,,,,,,,,,,,,,, dodger In a message dated 1/28/2010 12:30:03 P.M. Central Standard Time, stevec@xxxxxxxxxxxxxxxxxxxx writes: 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. -- [Non-text portions of this message have been removed] ---- 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.