The machinist and I had a lengthy discussion on valve springs and valves, we determined to use the later, larger valves and not risk ruining the head by going larger (there is a possibility of cutting into the water jacket on cylinder #1 running larger valves) the '72 head has smaller intake valves but the same size exhaust valves as the '78 and later heads, that is why we decided to just enlarge the intake (FYI for folks not familiar with the small Ford sixes; after '65 all exhaust valves were 1.38" in diameter, 170-250, '65-'74 intake valves were 1.649", '77 on intakes were upped to 1.75")Lou's Comet wrote:Your cam manufacturer will tell you what type/pressure valve springs to run with the cam. You might want to talk to them in case the head needs machine work for the springs, before you have the head work done?
As far as valve springs go, he is leaving it up to me to contact the cam manufacturer to see what they recommend with the cam set-up I am getting (as you have suggested Lou) I am sure it will be a month or more before I see my head again and in that time I will be getting my cam most likely and the valve springs, the machinist is ordering the valves and seats so he can get started (if he does) My other responsibility is to get my custom intake cast so he can do the machine work needed to attach it.
Lots to do.
See Ya,
Mike