<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By:
[email protected]</div><div class="ubbcode-body">Jerry MacNeish had the same problem with a 1965 396 that he just built for his Impala. The stock OEM pistons hit the heads. </div></div>my 396 had never been out of the car,66k original miles,still had its original shim head gaskets.when my machinist called federal-mogul they blamed it on the machine shop,when we told them it had never been apart,the tech guy laughed and said no way possible could it be that old and never rebuilt before!