Head gasket recommendations for magnum

Hang on now. You have a 5.2 MAGNUM engine? With flat tops with NO valve reliefs? There is your problem. As far as I know, no one makes pistons for the Magnum engine with no valve reliefs, so that means you have LA pistons in that engine I am willing to bet. Why does that matter? The Magnum block has a shorter deck height, so the Magnum pistons have a shorter compression distance. I bet you dollars to doughnuts you have LA flat tops in a Magnum block. The LA pistons have a longer compression height which will push the piston further up in the bore. Couple that with the Magnum's shorter dech height and you got problems.