FordMatty

Well, I've been told 10 different stories todfay :) well not hat many, but here goes,

Cleveland 4V heads, the cast marking on the end of the head says 4 but i dont believe these heads are 4V and that marking tells me nothing but some guys say it does mean 4v, What do the markings mean and there any other ways of telling 4V other than the inlet size

ps. does anyone have the inlet size handy for 2v and 4v

xacoupe

chances are if it has 4 on it , it will be 4v ... 4v heads have big valves .. big ports ..and usually closed chambers.
I dont have port sizes handy...but if you can look at the inlet ports and they are massive..then they are 4vs..if they look big but not huge..2v's

Chris Nee

Ford Matty,

For american built engines.
From what I have read and seen, the casting marks, 4V, on the heads mean they are american 4v heads. If there are no markings then they are 2v.

For aussie built engines, a 4v engine came with a 4 barrel mainfold and carb, and the 2v was a 2 barrel manifold and carb.

Anyone else know if I'm right?? (Don't mind being proven wrong).

xafalcon

All american manufactured cleveland heads have either a 2 or a 4 cast into the head. It is located on the flat surface of the head at either end where the head surface meets the intake manifold and the rocker cover gasket rail curves around.

All aussie cast heads had just a flat surface with no numbers in this particular location.

Valve size for 2V = 2.05 intake, 1.65 exhaust
Valve size for 4V = 2.19 intake, 1.71 exhaust

Note that both 2V and 4V came in open and closed chamber, and the 1974 4V heads had 2V valve sizes.

You can alwayss tell the 4V heads by looking at the exhaust port shape. 2V = true oval shape, 4V = almost square shape with an intrusion for the exhaust manifold bolt boss in one top corner.

Good luck
Tris

Racer

To add to that, there are also 4. (dot) heads.
Apparently they are all open chambered but the only ones I have seen have been closed chamber. Can anyone clear this up?

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xacoupe

4. is supposed to be closed chamber AFAIK .. my XB had factory 4. and they were closed

Great White

One way I tell when they are on the engine is to look at the intake runner as it enters the head.If it is broad(about 60mm or so)then it is 4V. I have seen 4 stamped on 2V closed chamber so the numbers aren't always reliable.

I have a couple of pics of heads I want to post but dont know how to do it.

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[V8]Ford Power

the number isn't stamped... it is cast - eg. raised above the level of the metal around it. Mine are cast on 4's.

ADZ351

mine are cast 4. (with a dot after the 4) they are open chamber but I also have a set of closed chamber with just the 4

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xacoupe

seems that there is no apparent reason for the dot.... I always assumed it was for closed chamber but that's since been proven worng