You should talk to Dwayne Porter. He speced the solid flat tappet I run as I told him I like a little Rump Rump in the cam. Mine is 264 and 270 @ .050 with .592 and .588 lift but I use 1.6 rockers for .632 and .628 lift. Has a 110 LSA and I have it in on a 106 centerline. Runs great and idles just right. Its in my 63 Sport Fury that is a street car and has run 10.70's on pump gas thru the exh. Ron