I have found a set of 6.0 heads on ebay for cheap. Now I need to know if they will work with the 5.3 block I dont have one yet but I like the 5.3 with the ls7 crank idea . will the 6.0 heads work on the 5.3 though with valve clearance to bore/cylinder walls?

 

Thats the thing, I don't know if you can run smaller valves in a 317 type casting head.........im almost sure you could