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Old 06-22-2006, 11:30 AM   #1
JoshP
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Default pic of 2.5 head gasket on 2.2 head

a lot of people were wondering about the mismatching of 2.2 heads compared to 2.5.



Im going to cut mine personally. This is p2 gasket on p1 head, I wonder if p2 2.2 heads line up better? I suppose I should mention frankenstein for the searchers.

this is what the head looks like:

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Last edited by JoshP; 06-22-2006 at 11:44 AM.
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Old 06-22-2006, 01:24 PM   #2
Russell Rogers
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That gasket is blocking water passages. I wouldn't cut gaskets either, it degrades the strength built into it. just get the correct gasket for the head.
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Old 06-22-2006, 01:47 PM   #3
JoshP
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Quote:
Originally Posted by Russell Rogers
That gasket is blocking water passages. I wouldn't cut gaskets either, it degrades the strength built into it. just get the correct gasket for the head.
thanks for pointing out the obvious. The heads are going on a 2.5 shortblock, the 2.5 gasket is used.
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Old 06-22-2006, 02:03 PM   #4
Rally_wgn
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Watching this as I am planning on a frankenmotor myself.
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Old 06-22-2006, 03:55 PM   #5
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something that was discussed on another forum is that the 2.2 turbo heads use the same coolant passages, and would line up much better. You can use the turbo heads in an n/a you would have to block off the oil and coolant feeds though.
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Old 06-23-2006, 12:01 PM   #6
opious
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Old 06-23-2006, 12:49 PM   #7
Tim Sanderson
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Quote:
Originally Posted by tzedek
something that was discussed on another forum is that the 2.2 turbo heads use the same coolant passages, and would line up much better. You can use the turbo heads in an n/a you would have to block off the oil and coolant feeds though.
Unfortunately though the p.2 2.2 heads are single port exhaust.
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Old 06-23-2006, 10:50 PM   #8
JoshP
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Quote:
Originally Posted by Tim Sanderson
Unfortunately though the p.2 2.2 heads are single port exhaust.
I think you quoted the wrong post? I would use p2 heads any day, they have bigger valves. Stock p2 makes more power than p1 (2.2s). But I looked at a P2 head, and the coolant passages are the same. So they wouldnt line up any better with the 2.5 gasket. But, the 2.2 turbo heads are P1 (dual port) and have almost the exact same coolants passages.
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Old 06-23-2006, 11:14 PM   #9
Tim Sanderson
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Bigger valves huh? I'll have to take a look-see at the manuals again.
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Old 06-24-2006, 01:26 AM   #10
JonofScio
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p2 uses same camshaft design and same valves as SOHC EJ25 head, FWIW. (I've researched part numbers, talked to gurus, and this is what I have come up with for information. but I doubt that I am wrong.)

And the phase II EJ22 makes slightly more power because of the bigger valves and slight bump in CR. (9.5:1 to 9.7:1) but I think it is an overall better torque curve. if you look at the dyno numbers, which can be found easily, just referencing to the peak hp/tq numbers, the phase II motor has a little more (like less than 10 in both areas) but offers it up quicker in the rpms... but this could be do to camshaft too, so who is to know which of the two heads is really all that much better?

I think flow charts of stock heads/valves would really show what differences in performance expecation and ability wise they both have. the biggest turn off of course of the phase II is that it is single port, and that turns most people off because of the effects of a well designed exhaust with dual ports can peform good scavenging, ect. but I have no real world diagnosis of whether this is really an issue for comparison for these heads or our motors... this is alot of rambling, but I get bored and don't get on here much. maybe there's some useful info here for those who care.

also, head shots... need to compare water passages.... I wonder if the p2 ej22 blocks and heads have the same overall design of passages, ect. as p1/p2 ej25 blocks/heads but are just at a slightly smaller piston bore and head combustion chamber shape. has anybody gotten REAL cc numbers on p1 and p2 EJ22 head combustion chambers? I'd like to see those numbers.

Most of the people running EJ22/EJ25 frankensteins are using p1 heads I do believe. if bigger valves is an issue and dual ports are a must, you can always get bigger valves made and your heads machined. don't forget that for less than $500 TWE can do a 5 angle intake and 4 angle exhaust valve job on our subie heads and that IMO is a huge improvement overall and is not to be overlooked when comparing using the p1 versus p2 argument of "bigger valves" as the only solution to more airflow.

/rant

Last edited by JonofScio; 06-24-2006 at 01:41 AM.
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