After reading so much different information on this, i'm not quite sure what to go with. I have a 4k bottom end where i'm putting in a cam with .396" in lift and .399" ex lift. I have been told that the retainers on the 3kbp head will limit the lift that i want. i have a 4k head aswell. Is it best just to swap the valves and rocker assembly over or is there anything aftermarket that would be more appropriate????
Also, i originally wanted a 5k but had no luck. So i would like to bore the 4k block a little. I think that 2.5mm brings me out to around the 1405cc. I know i can't really go much bigger so what would be a good piston to go off around that size? Any help would be appreciated. Cheers