Well a phone call vs asking the largest repository of people who may have tried this before, this makes sense for real world application experience. People run high comp pistons in 273’s with the same heads and they have the same basic design but they are made by a different company so I am wondering if anyone has run them or tried to run them, if there a slight point of contact I’ll grind the head a bit but these appear to basically be a 318 version of a 273 high comp piston so in theory it should work, the dimensions look like it should work, the issue is idk if the casting shape is a problem. Figured I’d ask in the one place I’d be able to find others who have done higher compression small blocks. Ive used these pistoms on very custom stuff just never chrysler heads. im juet doing another budgey build, i usually use kyb 167's for these at 0 deck and were able to use factory heads and my porting has gotten mosy all of them to 450 crank minimum, the idea of maybe getting 500 crank out of a 318 that has only pistons, cam, intake carb and headers is enticing. i love getting a lot out of mostly factory stuff. had a 500cfm 2 barrel on my 61 lancer turbo slant build years ago