As you may recall, I recently did some work on my A10 semi-unit Plunger engine. The camshaft was changed from standard to the Road Rocket 357? cam. I still have flat topped low comp pistons. Apart from the camshaft and followers, the engine has new little end bushes, new piston rings, new big end shells. The ignition timing was set as per Road Rocket, 9/32"? BTDC. Since the rebuild the engine now requires a fairly heavy kick to start it. After the previous rebuild, six years ago the engine was pretty easy to kick over to start. If I didn't know better, I'd say the engine had higher compression pistons. It's strange! Is this phenomenon caused by the new camshaft, or the more advanced ignition timing? I don't believe the engine is still stiff; I've done a few hundred miles since the rebuild.