[Mike C]

Big block Chevy's are notorious for cam lobes going flat anymore. If even one flat tappet cam fails, you would have been better off with the roller.

I just built an L36 427 for my 69 short bed. It has the big oval closed chamber heads, so figure 10:1 compression or just a bit more. I plan on running through iron manifolds and want a hot street truck not a daily. I chose the smallest Comp Nitrous roller. It has 113 deg lobe separation and 224/235 duration at .050. I am hoping the nitrous grind will bring the most out of the motor running through iron manifolds. While I think this will be a great street cam for MY application, I would suggest you stay below 220 degrees .050 duration on the intake for your 402.

Look at the computer controlled retrofit Comp roller. 210/220 at .050 on 113 lsa. Or even same grind on 110 lsa would be great with carburetor. I would call Comp as they have grinds that aren't in the catalog.