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because i can.
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10,154 Posts
I'd get them both personally...

The 2.5 is a good engine...there are some slight differences from the 2.7 but most obvious is the lack of a Variable Intake Valve plate and the 2.5 uses vacuum advance at the distributor to adjust timing...
 

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because i can.
Joined
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10,154 Posts
To my knowledge, with or without a cat, the 2.5 always put out 10 less than the 2.7....

That is to say:

Cat- 2.5 = 151 hp and 2.7 = 161
Non Cat = 2.5 = 161 and 2.7 = 171

I believe the main increase was from the butterflies, displacement and different heads...
 

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because i can.
Joined
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10,154 Posts
Actually I would stick with the 2.5 intake manifold for the time being and see about porting it out as it (anecdotally) flows better than the 2.7 manifold due to the lack of a bypass valve plate....

I'm still trying to get my hands on an extra 2.5 manifold to do a complete comparison...
 
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