I've been searching to find out what my cam specs are for a 350 M engine with a stock cam? I want to up grade, but uncertain to what yet. I have several ideas, but to know what I have now to what I should go to is a good place to start. I beleive the lift on 350 cams are basically the same, 260 intake 273 exhaust. I don't know the duration full or 50% lift? Thats the question I guess. My idea is some where around 209/214 duration w/ 424/443 lift,or 218/224 duration w/ 460/488 lift with the heads plained to boost up compression some so I don't loose to much low end torque,with the longer duration cam. So having an idea what I have now might help the oranges to apple theory.