I am building my twin turbo motor up and am installing a new cam and need help with the lifters. Motor is a 454 with 8:5 compression with 990 heads and twin t6 turbos. Motor may see up to 20 lbs of boost. Cam is a .660 lift solid roller cam with 113 lobe separation and intake centerline. Heads are setup for dual springs. Max rpms 6800. Was running a flat tappet cam before. Let me know if you need any other info.
Thats with 1.7 rockers. i also have 1.8 rockers so i guess need springs good to just over 700 lift if needed. Yea decided to go with a solid roller cam and go bigger. The cam in it was a flat tappet cam with 540 lift.