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Discussion Starter #1
I don't know anything about the history of my '84 GTV6, but I noticed that there is a difference between its left cylinder head and the one from my '82 parts car (history also unknown). The '84 has an unhooked sensor and a block-off plate (for a distributor in transverse applications?). It's hard to see, but it looks like it's stamped as a 2.5. Are there any real differences between these heads?
 

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The later head is set up for the front drive (164) distributor and the unplugged sensor you see is for the idiot light oil pressure switch used on the Milano.

I know they made some engine changes in 84 or 85 ( 3-wire O2 sensor and other electrical changes), but I don't know when the specific changes to the head took place.
 

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The later head is set up for the front drive (164) distributor and the unplugged sensor you see is for the idiot light oil pressure switch used on the Milano.

I know they made some engine changes in 84 or 85 ( 3-wire O2 sensor and other electrical changes), but I don't know when the specific changes to the head took place.
Are you sure about that 164 tidbit? The 164 didn't have a 2.5 in any market as far as I know.
 

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The 155 is the only car that would have had a 12 valve 2.5 like the GTV6, and that would have started in 1992 or so.
I highly doubt that 6 years prior Alfa would have started making changes in the heads to allow for a different distributor drive.

All the other cars you listed are 24V V6's, which are totally different engines.
 

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Discussion Starter #6
So, is this the correct head for an '84 or has it been replaced at some point in time with a newer one? I'm just trying to determine what I've got.

BTW, thanks for the help. I've learned a lot from this site so far, mostly as a lurker.
 

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It may be a Milano head for Verde as they also had blank off plate but it should say 3.0 not 2.5. As for idiot light oil pressure sender all Milanos had it.

Now if oil light sender is coarse threads it is early Milano. If fine threads it maybe 164 or later Milano as I think Milanos had two different thread pitch switches.
 

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Discussion Starter #9
It's hard to get a pic of the back of head while the engine is in the car, but here's the best I could do. What I thought was "2.5" is "2 S"? The right head clearly says "2.5", though.
 

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For what it's worth, the three US-based 84 GTV6s I am familiar with all have engine serial numbers that are 61xxx. Yours is 70325. This suggests to me that it is not the original engine.
 

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Discussion Starter #12
I looked in a shop manual for the Milano/75, and found this about the engine numbering scheme:

___1________2____
AR01911 * A60001 *

(1) Type number: This is allocated to each range with similar technical characteristics (i.e.: 01911 - 6V-2.5 Milano - 016.08 Alfetta 1800 engine, 019.13 2500 V-6 engine)

(2) Progressive engine serial number: This is allocated on a consecutive basis by the Production Department.


I'm now convinced this is a replacement engine of some sort with a later production date. Since Alfa Romeo was still operating in the US until around 1995, is it possible this was a factory replacement from the '90s?
 

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I looked in a shop manual for the Milano/75, and found this about the engine numbering scheme:

___1________2____
AR01911 * A60001 *

(1) Type number: This is allocated to each range with similar technical characteristics (i.e.: 01911 - 6V-2.5 Milano - 016.08 Alfetta 1800 engine, 019.13 2500 V-6 engine)

(2) Progressive engine serial number: This is allocated on a consecutive basis by the Production Department.


I'm now convinced this is a replacement engine of some sort with a later production date. Since Alfa Romeo was still operating in the US until around 1995, is it possible this was a factory replacement from the '90s?
More than likely a Milano engine from either 87-88-89 time frame as that was last model of the 75 sold in US up to 1989.

I have never seen a 88 or 89 2.5 engine so maybe an 89 as only 3.0 Verde engines I have seen have that blank off plate on rear of left head.
 

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"Late" style Milano 2.5 V6 engines have that block-off plate. "Late" does not necessarily mean late in terms of US Milanos. I had a 1987 MY Platinum with original 2.5 engine which had the block-off plate. That was the engine originally in Roxanne. Anyway, you have heads or entire engine from 2.5 Milano.
Jes
 

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Discussion Starter #15
Thanks to everyone who replied and helped me identify this engine & heads! I appreciate all the helpful input and knowledge here.

It's nice to know what I'm working with.
 

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Below are a list of engine numbers for the gtv6 and 75 (milanos)
I have a gtv6 with a 3.0l 75 engine in fro a 1988 car and it has the blanking plate and oil level connector so if you look at your engine number you will find which car its from

116. 46 01646 GTV 6 2,5 80-83 116 C
116. 46 01646 GTV 6 2,5 Serie 3 83-86 116 CA

Type # Engine # Model
162 Series Alfa 75 "Milano"

162 B2E 611102 Alfa 75 1,6 ie
162 B1L 61202 Alfa 75 1,8 ie Kat
162 BF 61212 Alfa 75 2,0
162 B4 06224 Alfa 75 Twin Spark -87
162 B4A 06224 Alfa 75 Twin Spark 88-90
162 B4C 06166 Alfa 75 Twin SparkKat
162 B1C 06134 Alfa 75 Turbo
162 B1E 06158 Alfa 75 Turbo Evoluzione
162 B3 01646 Alfa 75 2,5 V6 QV
162 B6 06120 Alfa 75 3,0 V6 -87
162 N6A 06120 Alfa 75 3,0 V6 88
162 B6B 06124 Alfa 75 3,0 V6 Kat
162 B6 0 Alfa 75 3,0 V6 QV Kat
 
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