Well, in another post I found a link to a Master parts catlog that only goes up to 1957. It lists the cam p/n 3836484 as fitting 53-54 corv, 54-55 util (6 cyl), and 54-up comm util ( w/ 261) only. It has a serperate p/n for all other 6 cyl.s. The site with the master catalog is chevy.oldcarmanualproject.com/1929_57chevyparts/57cmpc0138.html.
the relevant sections are 0.519.
the spring are listed as the same,starting in '56 I think, but they have a seperate p/n for corv. inner's. this is located @ 0.303.
I also noted that a 261 long block w/ 11" clutch sold for around $450.00 in 1957!! I'll take three please!
