351 4v or aussie?
351 4v or aussie?
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Freshman User
Joined: May 2002
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From: Kalispell USA
351 4v or aussie?
which is better for low end torque? I have read in these boards about some people rebuilding 400's with both the 351 4v closed chambers and others going with aussies. I hope that this is not a stupid question; I am new to this motor head stuff and i have a '79 bronco that is dead and rusting away and i want to revive it into a hoss torque monster but i only want to do it once! Thanks for the patience. 
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Joined: Feb 2001
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From: Porterfield
351 4v or aussie?
IF you can get yourself a set of Aussie heads then I'd use them over the 4V heads. with the 4V heads you have to be up in the Rpm's( Above 5000 ) to get the usefulness out of them.
Tuned
Joined: Jun 2001
Posts: 266
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351 4v or aussie?
>IF you can get yourself a set of Aussie heads then I'd use
>them over the 4V heads. with the 4V heads you have to be up
>in the Rpm's( Above 5000 ) to get the usefulness out of
>them.
Shazam - I too am a fan of the Aussie's and have a set waiting to be machined. ...but I've always wondered if the added cubes of the 400 may make the 4V heads beneficial at lower RPM's since they should have ~15% higher port velocity at a given RPM. Thoughts?
>them over the 4V heads. with the 4V heads you have to be up
>in the Rpm's( Above 5000 ) to get the usefulness out of
>them.
Shazam - I too am a fan of the Aussie's and have a set waiting to be machined. ...but I've always wondered if the added cubes of the 400 may make the 4V heads beneficial at lower RPM's since they should have ~15% higher port velocity at a given RPM. Thoughts?
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Freshman User
Joined: May 2002
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From: Kalispell USA
351 4v or aussie?
the aussies on ebay, are they the right size? Are there different sizes? The ebays are 58.4 cc, would this be the ones i need for my 351m to 400 transformation? Is $315 for these heads a good deal? Thanks again for the enlightenment, ford gurus! 
Senior User
Joined: Jan 2002
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351 4v or aussie?
There was only ever one version of the closed chamber 2v heads, so if they haven't been machined they will all have the same size chamber.
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Tuned
Joined: Jun 2001
Posts: 266
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351 4v or aussie?
>the aussies on ebay, are they the right size? Are there
>different sizes? The ebays are 58.4 cc, would this be the
>ones i need for my 351m to 400 transformation? Is $315 for
>these heads a good deal? Thanks again for the enlightenment,
>ford gurus!
Yes - that is a very good price and they are the heads you want. Got mine for about $340 and they had been cleaned and magnafluxed. Shipping is typically $60 to $80...
>different sizes? The ebays are 58.4 cc, would this be the
>ones i need for my 351m to 400 transformation? Is $315 for
>these heads a good deal? Thanks again for the enlightenment,
>ford gurus!
Yes - that is a very good price and they are the heads you want. Got mine for about $340 and they had been cleaned and magnafluxed. Shipping is typically $60 to $80...
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Freshman User
Joined: May 2002
Posts: 33
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From: Kalispell USA
351 4v or aussie?
got em on ebay for 275...guy is charging 98 bucks to ship em... i think the shipping is bs...did not say if it was magnufluxed, just clean and crack free...from NC to MT... came with various parts and a rebuild manual... think i got hosed? it promised that no machine work has been done..
Senior User
Joined: Mar 2001
Posts: 296
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From: Maryland
351 4v or aussie?
I purchased the same heads from the same guy in NC. Shipping to MD was aroung 55.00. They were perfect! They are on a Modified 351M. I had them machined, 3 angle valve job ported and polished. They bolted right up with no problems. Art
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