Hello .. First message board posting . I am having major problems installing pistons with new rings in my 88 chevy 350 . All gaps are within specs , machine shop said pistons look good , rings are cast iron from napa , rings are on correctly ( i paid close attention to markings and directions ) piston was placed in the original orientation ( mark towards the front) all pistons slide freely in there cylinders with no wooble( without rings ) , I coated the piston and bore with plenty of oil , and now the piston is completely jammed in the cyllinder ??? I tried the next piston and it also jammed . I used a somewhat flimsy ring compressor for the installation . Could this have caused a problem ? What am i missing? I have never had this kind of problem . All my previous engine rebuilds were water cooled VWs . This is my first push rod V8 .