spotbiltxo Would go with the thick one for warp reasons as was said. I like to put a thin coat of gasket maker on the gasket then wash the head flat surface clean and dry .Put the gasket on so it is like a dam to the oil then tighten the cover while the gasket maker is still pliable. If you don't put gasket maker on the top gasket surface may be able to take it on and off when needed. But of course it will soak up oil worse so your call . My .02 cents If you wait overnite before starting so your stuff can set up may not get oil soaked as soon .
