K800 k motion. Check the site. The smaller cam might like these hers084-283 175lbs/1.75- 400/1.150 those springs are to my recollection a little lighter than advertised at open psi...I think 375-380 was what I found.
I run a .575 [email protected] 108 solid roller and use k800 springs for higher rpm, insurance. I have a set of the Herbert's ...but my cam is a custom grind just past that level of spring. Did it to myself when I asked for a little narrower Int to touch 7000 rpm. Fwiw Bruce came up with the cam numbers and told me I needed more than the herbert spring.... i went and picked the k800...they fit the installed height of a sbm... 1.70-1.75
