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cylinder head diffrances 

 

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 Post subject: cylinder head diffrances
Posted: Tue Jun 06, 2006 8:44 pm 
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Location: canberra
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whats the diffrance between 3.9 and 4.0 heads? im after a cheap 4.0 head in canberra

 

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Posted: Tue Jun 06, 2006 8:48 pm 
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The biggest difference would be the swirl ridge that was ditched when ford went 4.0

 

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Posted: Tue Jun 06, 2006 9:29 pm 
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i have a die grinder so that could soon be removed. any other diffrances? ie comp ratio and will it bolt up to a 4.0 with multipoint?

 

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Posted: Tue Jun 06, 2006 9:34 pm 
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It will bolt up

The compression ratio is the same, but the 3.9 pistons have a bigger dish (because of the swirl ridge).

 

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Posted: Wed Jun 07, 2006 12:36 am 
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cheers

 

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