TRYNKEEPUP 0 Posted November 22, 2008 hi ive been looking about at forged pistons, for 1.9 8v, as i understand the standard bore is 83mm. The pistons come in 83mm, 83.5mm and 84mm, why is this ? and will say 83.5mm fit a standard 83mm bore ? just wondered why this is. cheers Share this post Link to post Share on other sites
Flix 0 Posted November 22, 2008 They are oversized to accomadate a re-bore. You must use the correct size. Share this post Link to post Share on other sites
