Roger - I have to say that the Odyssey that we discussed in some detail a few months ago cranks my mild 302 exactly the same as the big Optima and maybe a little faster - but that's probably only desire. I started with a dry fuel system so had to crank a bit longer then normal and - it still cranked nicely, going through the start then stall routine several times while the fuel system filled and the engine warmed a bit

What's the voltage at the terminals, before, during and after a crank cycle? That should tell you the story and will probably be what XS will ask you