careful with the springs 2 firm ones are better than light ones with a big block --- the oil control is more than likely exhaust valve seals -- you said the plugs looked fine so one could say the seals on the valves if they even put them on are bad ( as in hard like a rock ) take a valve cover off and look to see if it has any and the type -- best type would be a rubber type cap with a tin band type clamp to hold it onto the valve guide -- not a floating seal like some have that looks like an umbrella --- jz
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