Thanks! The only spec I could find from a Ford source was in the Model T service manual which specified something ridiculously low like 24-28 lbs when compressed to "valve closed" height. Even 34-38 seems low to me though... I guess I've been messing with too much "modern stuff" (early 40's tractors and such).
The low valve spring pressure is the reason why you dont need to worry about the lack of zink in most of the automotive oils.No need for zinc additives at all in these old engines,but if it makes you feel better,go for it!
