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Old 07-23-2002, 02:19   #1 (permalink)
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heads

g'day all out there,

I am a new member and I have a couple of questions that hasve been bugging me for quite a while now, and someone out there may be able to answer them for me, they are to do with Cleveland heads

First, what is the difference between an open chamber head, and a closed chamber head?

Second, what is the difference between a 2V head, and a 4V head. I believe it may be something to do with the inlet and outlet ports, but I am not sure.

Another question while I am at it: How much can be taken off the head(s) before an inlet manifold machining is required, or should the inlet manifold be machined wirth the heads?

Thanks for your help
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Old 07-23-2002, 04:52   #2 (permalink)
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Open chamber is close to hemi head usually 2v
Closed chamber is similar to a wedge type head
used on 302's and the 351 4v heads..
2V = 2 barrell or ventury... 4V =4 barrell bigger valves

The 2v heads with 4v valves fitted "arguably" make more torque
and better street heads..There are tongues that can be bought now to help velocity at lower revs....
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Old 07-23-2002, 19:58   #3 (permalink)
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thanks for the info ebxr8240
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Old 07-23-2002, 21:24   #4 (permalink)
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In Australia 2V Closed Chamber heads came out on the 302C motors while 2V Open Chamber came out on 351C (except GT and HO which had 4V heads). 4V heads are easily recognisable off the car because of their massive ports and valves when compared to 2V . On the car it is a little harder but on top of one of the corners of each head they have a raised "4" cast into it.

The general consensus these days is that modified 2V heads are better on the street, 4Vs are too wild, more designed for high RPM work. Open chamber if you plan to run pump petrol, too much compression otherwise neccessitating Avgas or similar higher octane fuel.

There were also 2V and 4V Windsor heads, I'm not sure what the differences are or what cars they came out on though...some of the other more knowledgeable Ford Forumers might be able to help out here...
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Old 07-24-2002, 04:38   #5 (permalink)
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And just a comparo pic of the close/open chamber chambers -



Yep, there where 2v and 4v windsor heads, basically the 4V heads were simply small chamber heads, around 57cc iirc, they were found on the famous 'K' code 289 and for one year only (1968) as the 'J' Code as used on the 230hp XT GT Falcon and various US Fords. Theses heads actually had 4V stamped into the rocker valley.

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Old 07-25-2002, 01:44   #6 (permalink)
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thanks for all you help! Much appreciated
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Old 07-25-2002, 02:37   #7 (permalink)
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and thanks very much for the link, Kieron the photo explains it all explicitly!!!
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