Gentleman I need some advice. I have a 55 Chevy with a stock v8. When you try to start it the crankshaft tries to turn a little but nothing else happens which leads me to believe that the rings have rusted and seized on one or more cylinders. Marvel and seafoam have not helped. What do you guys think about pouring vinegar, muratic acid, or CLR down the intake? Transmission fluid? All suggestions wanted, would like to keep this original engine in the car!