Hi, Guest
04-29-2004, 05:37 AM
You will also need a good set of feeler guages to check valve lash.
In addition, if you select a cam with lift over .400" you will need to enlarge the cam pockets in the head for clearance. This requires milling a significant amount of aluminum out of the head.
Also be aware, that with lift over .400" you may very well need to replace springs and retainers. This has nothing to do with valve float. The fact is, with high lift, the cam may compress the valve springs solid before they have completely opened the valve. If the this happens you can break the cam and/or the valve retainer and possibly punch the valve into the cylinder.
Compounding this problem is the fact that Ford didn't manufacture the heads to high tolerences, and a number of spring seats have been found to be higher than they should be. This additional height contributes to reduced spring compression distance.
Hope this helps.
In addition, if you select a cam with lift over .400" you will need to enlarge the cam pockets in the head for clearance. This requires milling a significant amount of aluminum out of the head.
Also be aware, that with lift over .400" you may very well need to replace springs and retainers. This has nothing to do with valve float. The fact is, with high lift, the cam may compress the valve springs solid before they have completely opened the valve. If the this happens you can break the cam and/or the valve retainer and possibly punch the valve into the cylinder.
Compounding this problem is the fact that Ford didn't manufacture the heads to high tolerences, and a number of spring seats have been found to be higher than they should be. This additional height contributes to reduced spring compression distance.
Hope this helps.