Yup, you can. None of the 170s ever came with the "revised" chamber head that I know. I think that head came out in 68. Same size chamber, just made supposedly "better"....kinda stupid, really, IMO. They should have redesigned the whole head FOR the 225, but performance was not in the the ballpark. Just remember to use the 225 pushrods as they are longer than the 170 pushrods.
