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[toj28]

can i put 2.5v6 heads on to a 3ltr omega and can someone tell me the diffrence thanks

[Dazzler]

You probably can but you will lose alot of power, approx 30bhp...

[MutantCav]

Why would you want to? You can but there may be compression issues...you will lose power as a result of the cams being 1mm different in size (about 20bhp), I think the block is the cubic capacity bit so you wont lose all your power?? Or is that the heads too???

[Marks DTM Calib]

It ups the compression ratio into the 11's......so not advisable!

[markey mark]

i have heard its a power upgrade putting 2.5 heads on 3.0 !! carnt understand why the 3.0 heads have 1mm bigger valves and sodium filled exhaust valves !! :-?

[Marks DTM Calib]

The valves are the same size.....the cams have slightly higher lift (but could be swapped) and the exhaust valves are sodium filled to give better thermal properties.

As for a performance upgrade, its fine if you are going to use high octane fuel all the time.

[Essex_Andy]

I have no proof but have read on here that 2.5 heads fitted with 3.0 cams offer a sizeable performance gain when fitted to 3.0 engines.
Something about increased compression ratio? ? ? ? ?

[toj28]

it does increase the compression and ive been advised not to go a head as it woint run right and will most likely blow gaskets so i woint bother

[MutantCav]

Thinking about it, my mutant cavalier had a 3.0 v6 omega engine with 2.5 top end fitted and messed about with by Courtney, reportedly produced 270bhp although that couldnt be verified as the clutch couldnt cope with the power and slipped all the time I had it...@I guess with the 3.0 block capacity and the 3.0 cams there would be no real loss in power from the 2.5 heads, and increased compression could add power IF done correctly so the compression didnt blow the gaskets...also remapping the ECU may help.