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Author Topic: Cylinder heads  (Read 922 times)

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Bent valve

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Cylinder heads
« on: 28 February 2009, 12:37:47 »
Hi everyone, I am new to the site and wondered if anyone can tell me if the 3ltr and 2.5 heads are interchangeable, as I would like to fit the heads from a 97 2.5 onto a 97 3ltr. I understand the camshafts are different but are the heads and valves indentical?
I hope someone can help,
cheers
 Mick
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philhoward

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Re: Cylinder heads
« Reply #1 on: 28 February 2009, 12:50:35 »
I believe they are different and will change the compression ratio..
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PaulW

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Re: Cylinder heads
« Reply #2 on: 28 February 2009, 13:04:16 »
I think I remember MDTM saying fitting 3ltr heads to a 2.5 will lower compression, thus reduce power...

Fitting 2.5 heads to a 3ltr should then have the opposite effect.

I know alot of Vectra owners fit 2.5 heads to 3ltr bottom ends...
« Last Edit: 28 February 2009, 13:22:37 by PaulW »
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Humbugs...

Bent valve

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Re: Cylinder heads
« Reply #3 on: 28 February 2009, 13:15:53 »
 Thanks for the info, my other option is to put the complete 2.5 engine into the 3ltr does anyone know if this is a straight forward swap and what other items eg ECU etc would I need from the donor car?
Thanks
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