"I've searched a bit and found many threads devoted to putting a Chevy truck engine in a boat, but I did the opposite. I recently purchased a 67 Chevy C10 smoker after the owner offered to throw in a good engine. Turned out to be a Mercruiser 165 hp 250 ci inline 6. It of course required some mods using the trucks original manifold etc including the distributor which provides for vacuum advance. It runs great, started on the first try w/o a wisp of smoke. However I didn't get a chance to drive it much before it was put away for the winter. I've read these Merc engines have HD bearings and a cam ground for high RPMs. I'm curious if anyone can guess how this engine will perform in a truck? I'm also curious about the compression ratio? Thanks for your observations and expertise, Jeff"