A buddy of mine has a set of SE 259E cams that are lightly used that I can get for a good price. My '11 FXS has stage 1 done on it. Stock 96. Would these cams be too much for the stock heads? Would pistons and/or valve springs need to be upgraded. I would like to upgrade to a hot 103 setup in the future.

 

Do it all at once and yes the 259 heads need new springs, so you might as well port and polish the heads. Careful exceeding 120 hp as your stock crank won't take it. Why does your buddy have a set of lightly used 259s? Might want to explore the reason for that.

 

i can personally attest to the crank not taking it, i went from 203's to 211's and right now my motor is being rebuilt with darkhorse fixing the crank the way it should have be done to begin with.

i will make ya a sweet deal on my old 203's. nothing wrong with them just went a tad wilder. 25.00 and freight and they are yours

 

U have to build a motor with parts that work together, Just putting in a Cam TOO big without all the other work will produce a motor they runs and performs badly....