[worlz08]

what should i set the gap to on gt40p heads stock lifters and high lift springs???

[SALIV8]

? u talkin bout valve lash? or spark plug gap?

[Iownastang]

Originally Posted by SALIV8 ? u talkin bout valve lash? or spark plug gap?

he talking about valve lash more than likely

[worlz08]

yeah valve lash????

[SALIV8]

This is what I've used and seemed to work good....

1. Place crank at TDC, compression stroke
Firing order for 5.0 is 13726548 (verify - that's from memory)
Both valves for #1 cylinder should be fully closed at this time - check
2. If you have a drill and oil pump priming rod, pump up the lifters now (run drill motor in reverse) if not, you should disconnect the coil and spin the motor PRIOR to setting the crank at TDC
3. Place rocker on stud and run the nut down until you feel some resistance. Now, back off the nut a bit, use fingers of one hand to grasp pushrod and turn it. It should turn freely. Tighten nut by hand while spinning pushrod back and forth between two fingers. At about the same time you feel resistance in tightening the nut, you should also feel resistance to turning the pushrod. This is zero lash.
4. Use wrench to turn nut down an additional 1/2 - 3/4 turn (I use 2/3 turn, but there is no magic in that). If you have locks, hold the nut steady with wrench and tighten allen nut down to lock the nut at this position.
5. Now, turn crank 90 degrees clockwise and go to rockers for cylinder 3. Repeat 1-4.
6. Turn crank 90 degrees and go to cylinder 7. Repeat 1-4.
7. Etc. following firing order. Always verify that both valves are closed prior to adjusting each rocker.

After you have driven the car a bit, it's a good idea to take off the valve covers and repeat this process with a warmed-up engine. I just finished the second setting of my rockers and found some inconsistency in preload as the initial setting was done cold and, probably, without all lifters pumped up equally.

I think that about does it.