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Blurr
10-19-2010, 01:46 PM
On a 2nd gen set of heads, how does one tell which head is which, the front or the rear.

I have an extra 2nd gen head and I'm not sure if it's the front or the rear. It was disassembled at some point so I can't tell which side it was used on but if the loosely placed cam caps are any indicator, it was a front head, but looking on the side where the cam caps are, I can see the two holes for the Cam sensor bolts, where it would be installed.

Are the 2nd gen heads reversible?
Blurr
10-19-2010, 04:15 PM
Excellent!

I was worried that the front head didn't have the mounting location for the Cam Sensor.
blindmist
10-19-2010, 04:19 PM
It can be pretty easily identified which is which by looking at the mounting place for the thermostat housing. The timing belt side of the heads are going to have the caps blocking the holes.
Blurr
10-19-2010, 06:33 PM
It can be pretty easily identified which is which by looking at the mounting place for the thermostat housing. The timing belt side of the heads are going to have the caps blocking the holes.

That's what I would normally check, the caps, but the head has been disassembled and the caps were kind of just sitting there, no way of knowing where they originally sat.

I've been told that the head can be reversed so if you turn a front head around it becomes a rear head basically. I seriously hope this is true.
stealthee
10-19-2010, 07:12 PM
They're the same.

Steve

No. The rear head on a 93+ has the mounting location for the CAS. The front head does not. They are not the same.
Blurr
10-19-2010, 07:40 PM
Ugh, frustrating conflicting information.

I have one head from a '94, it's totally stripped down so I can't tell what's what.

Stealthee, are you sure that the 94+ heads still have the CAS sensor mounting location? I'm being told by other people otherwise, that with 94+ heads, you can use them on either side because they're identical.
stealthee
10-19-2010, 08:01 PM
No, one 91-92 you can you use them on either, but not on 93+.
Mean Green
10-19-2010, 09:39 PM
No, one 91-92 you can you use them on either, but not on 93+.

I got 2 sets of 93 heads here and they are identical.
stealthee
10-19-2010, 09:42 PM
Hmmm. I must be remembering different then. I could have sworn there was a difference. I guess I could have went to my garage and looked and the 93 engine sitting on the floor to find out for sure. I'll take your word for it and note it for future reference.
Boostaddict
10-19-2010, 09:43 PM
No, one 91-92 you can you use them on either, but not on 93+.

Damn, no wonder my vr4 isn't running 9s yet, I switched the heads around! '93+ heads are all the same.
Unknownvr4
10-19-2010, 09:50 PM
Yea my 94 TT heads are the same... And the TT heads i have laying around are the same too
Mean Green
10-19-2010, 09:53 PM
In all honestly...there is no telling what is what as the 93~94 are the bastard year's for Mitsubishi...They have the rarest ecu's and the most random mix of parts....the best combination's IMHO...
Blurr
10-20-2010, 02:04 AM
Just for clarification, are we conclusively saying that the 91-93 heads are both the same front and back and the 94+ heads are the same front and back, but the 91-93 heads and the 94+ heads are not the same?

It was my loosely defined understanding that the 91-93 heads had the CAS mounting location but not the Cam Sensor mounting location and that the 94+ heads have the Cam sensor location but not the CA location.

Thats the way it seems to be based on my varied conversations with people... and this thread.

Side Note: I just beat the single player campaign of StarCraft 2, holy crap that's a good game!
Blurr
10-20-2010, 03:41 AM
They've got the ID cast into them at the end.
Ist gen TT heads have 3T
2nd gen TT heads have something like 3T2 on them (mine have gone for scrap)
1st gen N/A with the big ports have 3N on them
2nd gen N/A with the small ports have 3A on them.
That's the JDM heads.

Front & rear are identical in every case.

Steve

Damn, that's some good data :) "Front and rear are identical in every case", that's exactly what I wanted to know.
stealthee
10-20-2010, 06:07 PM
Just for clarification, are we conclusively saying that the 91-93 heads are both the same front and back and the 94+ heads are the same front and back, but the 91-93 heads and the 94+ heads are not the same?

It was my loosely defined understanding that the 91-93 heads had the CAS mounting location but not the Cam Sensor mounting location and that the 94+ heads have the Cam sensor location but not the CA location.

Thats the way it seems to be based on my varied conversations with people... and this thread.

Side Note: I just beat the single player campaign of StarCraft 2, holy crap that's a good game!

91-92 are the same. 93-99 are the same. 93 is when the seperate cam and crank sensors started.
Blurr
10-21-2010, 12:49 PM
91-92 are the same. 93-99 are the same. 93 is when the seperate cam and crank sensors started.

Ah yes, you are correct. 93 is when it started, not 94. Thanks.
SnakeSkinner
10-21-2010, 06:57 PM
the front and rear head are the SAME, thy just mount opposite from each other on the motor.

91-92 TT heads are the same front/rear

93-99 TT heads are the same front/rear