Ok first off I know this is a slant 6 site. I dont know were to find the answer to this though.

Could I replace the 1.5 rockers on a 74 stock 318 and replace them with 1.6 or even 1.7 rockers with out replacing the valve springs and with out causing valve to piston clearance problems???

On the 1.6 I think stock springs will work,it depends on your cam, for more info on this check moparchat.com,register and go to performance talk ask there and you will get your answer,,speedfreak.