need to watch retainer to valve guide clearance and piston to valve clearance

i run a .485 lift roller cam in my 318 with stock untouched 360 heads,(88-360 headed 318 cop engine never been apart yet)

i swaped to comp-901-16 springs and used all stock retainers,valve seals,push rods,rockers

lunati voodoo roller cam 60710

258/264
.485/.485 lift

work great for a daily driver in a stock engine in a stepside truck

the comp springs drop on and .485 lift works great,IMHO

if it has the rotators on the exhast valve,drop those and use 8 more intake retainers and spring

the rotators make the exhast spring and clearance less in stock fourm..will not take much lift with them on the spring