whemme wrote:
How was it possible to install a bigger cam. I can’t see how a bigger cam would fit into the existing bearing journals that hold the cam.
The lobes that activate the valves/lifters are taller and longer duration of lift.
For the Op... you probably just want to move about 10% so 4.56 to 4.10 would be an example or 4.10 to 3.73 depending of course on what is available. Your RPM will move down the exact same percentage. Speedometer will need corrected, I think a replacement gear on the speedo cable.