03' 4V Flow #'s

[1 BAD 03 MM]

Flow numbers, it compares 2003 4V heads to 1999 4V heads.

Lift------2003 Exh------2003 Int------1999 Exh-------1999 Int
0.050-----35------------46------------28--------------35
0.100-----74------------95------------68--------------87
0.150----105-----------128------------99-------------118
0.200----126-----------161------------121------------153
0.250----146-----------182------------136------------184
0.300----159-----------226------------145------------204
0.350----165-----------245------------151------------218
0.400----171-----------259------------153------------223
0.450----173-----------262------------156------------228
0.500----175-----------266------------158------------231
0.550----176-----------268------------159------------231

Some interesting info to read through: :burnout: :burnout:

http://www.modfords.com/forums/showthread.php?t=3050

[David Morton]

Are these #'s per valve or for the two as a pair?

MIND WORM! Now you got me wondering what can be done with some porting, smoothing and polishing!

It's getting worse. What about seperate specs for lift, duration and timing for each valve?
Now I won't sleep! :lol:
Thanks a lot, buddy. :lol:

[TripleTransAm]

I'm guessing per port, but that's just a wild guess.

[BillyGman]

Yes, I believe it's per runner like Steve stated. But whatever it is, it's the same standard that every cylinder head flow device uses.