I had a Wiseco 1mm OB piston in my 350 when i bought it, nothing wrong with it... but then when i found out that the sleve was ovel, i went to the JE 2mm OB with the 10.50 to 1, and it was a different world,... other then now running 101 oc. fuel in it,... just in holding the 2, the JE was much lighter and looked like it was built better... id recomend going with the JE... it is nice if you need to go to a 2mm OB... saved me alot of money over re sleving it....