Pics 5 & 6: Early #3, Casting mark Inverted: 3@, Ports: 40mm inlet/32 outlet

Pics 7 & 8: Early #4, Casting mark inverted: 4@, Now webs cast between ports, Ports: 40mm inlet/32mm outlet

 

Pics 9 & 10: Late #1, Casting mark: @1, Ports: 40mm inlet/32mm outlet, probably suits 105 1300 engine

Pics 11 &12: Late #2, Casting mark: @2…( note 3 dots after 2), Ports 40mm inlet/36mm outlet; probably from 105 1750 engine, would suit 2ltr

 

Pics 13 &14; Late #3, Casting mark 3, Now webs between ports, Ports: 40mm inlet/ 36mm outlet

Yours in Alfas

Ken

 

This is great info, Ken. I currently have an unmodified early #4 on my car, but since then I've acquired a late #6(?!?), which you don't have listed there. Any ideas what that might be? I think it's from a Euro 2L. Pic is attached

The motor is a nicely warmed over 2L with 10.4:1 pistons, Autodelta cams w/ 10.6 mm lift, and 40DCOE32s with 32mm chokes. I'm thinking the smaller ports on the early manifold are probably holding back the engine somewhat, so over the winter I plan on swapping over to the later manifold and possibly going to 33 or 34 mm chokes with appropriate jets / emulsion tubes / etc.

-Jason

 

This is great info, Ken. I currently have an unmodified early #4 on my car, but since then I've acquired a late #6(?!?), which you don't have listed there. Any ideas what that might be? I think it's from a Euro 2L. Pic is attached

The motor is a nicely warmed over 2L with 10.4:1 pistons, Autodelta cams w/ 10.6 mm lift, and 40DCOE32s with 32mm chokes. I'm thinking the smaller ports on the early manifold are probably holding back the engine somewhat, so over the winter I plan on swapping over to the later manifold and possibly going to 33 or 34 mm chokes with appropriate jets / emulsion tubes / etc.

-Jason

Hi Jason, thanks for your contribution. Can you measure the ports if it is as cast and can you determine any other differences from the other late manifolds I have listed.

Ciao

Ken

 

Hi Jason, thanks for your contribution. Can you measure the ports if it is as cast and can you determine any other differences from the other late manifolds I have listed.

Ciao

Ken

How are you measuring? On the carb side the ports are chamfered, are you measuring from the face or where the chamfer ends in the bore? I assume on the head side you're measuring horizontally?

-Jason

 

Carb Thread.

This is great information guys. I didn't know there was such a selection of manifolds. I hope you develope this thread a bit more and lets us all know where each of these manifold came from and what they'll fit. Thanks.

 

How are you measuring? On the carb side the ports are chamfered, are you measuring from the face or where the chamfer ends in the bore? I assume on the head side you're measuring horizontally?

-Jason

Jason,

On both sides I measured the maximum diameter at the face. 2 of my measurements were of chamfered units. Pehaps the diameter that the chamfer leads to is important and differs from casting to casting and usefull to have.

Ciao

Ken

 

In my Spider 1.6 FL 83 i have the manifold 3 with 2 Weber 40DCOE 106/107...

 

Hi Ken, finally got around to posting data on this manifold that I believe is from a 2L (but can't confirm certainly other than by it's shape) ;

-dimension at carb side chamfer 42.0 mm
-dimension at carb side 39.5 mm
-dimension at cyl head side 35.5 mm

The thermostat cover on this unit is broken...anybody have any idea where I can get a replacement one?

 

Early Weber Intake Manifold

Ken,

These Are Photos Of The Intake Manifold We Have Been Talking About In Another Thread (items for sale). It Has A Rough (sand cast?) Finish, A Sideways #2 Stamped In The Center, Has Head Ports Measureing 37mm X 48mm (I am measuring the head side ports vertically & horizontally as that is how alfa did it in their "PERFORMANCE OPTIONS CATALOGUE") & Carb Ports Measuring 40mm Chamfering Out To 45mm. These Measurements Match Up With Intake Manifold #10502.01.060.02 ("1600 105's") Listed In The Above Catalogue. As You Can See This Manifold Matches Up Well With Your First Manifold Shown "man 4" (in fact I can't see any differences between my stamped #2 and your stamped #3 manifold). You Should Measure Your "man 4" Head Side Ports As Alfa Did (vertically & horizontally) To See If There Is A Difference As The Options Catalogue Also Shows Head Ports Of 31mm X 40mm (#10516.01.060.02) And 38mm X 49mm (#10502.01.060.01 & #10532.01.060.00).

-John

 

Ken,

These Are Photos Of The Intake Manifold We Have Been Talking About In Another Thread (items for sale). It Has A Rough (sand cast?) Finish, A Sideways #2 Stamped In The Center, Has Head Ports Measuring 37mm X 48mm (I am measuring the head side ports vertically & horizontally as that is how alfa did it in their "PERFORMANCE OPTIONS CATALOGUE") & Carb Ports Measuring 40mm Chamfering Out To 45mm. These Measurements Match Up With Intake Manifold #10502.01.060.02 ("1600 105's") Listed In The Above Catalogue. As You Can See This Manifold Matches Up Well With Your First Manifold Shown "man 4" (in fact I can't see any differences between my stamped #2 and your stamped #3 manifold). You Should Measure Your "man 4" Head Side Ports As Alfa Did (vertically & horizontally) To See If There Is A Difference As The Options Catalogue Also Shows Head Ports Of 31mm X 40mm (#10516.01.060.02) And 38mm X 49mm (#10502.01.060.01 & #10532.01.060.00).

-John

John thanks for posting here.

My #3 Stamped manifold has a head side port measurement of 38mm X 49mm so maybe (#10502.01.060.01 & #10532.01.060.00).


My manifold does not have the tapped hole into #1 port as does yours. It also has a number 1 stamped in the area circled in green. Picture is of your manifold. My #3 manifold also has some over stamping in the area of the #3 stamp.

BTW: I am not claiming my stamped #3 manifold is from GTA. I don't know where it came from. Maybe a Carlisle swap meet years ago.

My GTA 1600 head on 752507 is large port and has a ported matched later style 1600 manifold (casting mark 3, so no screw in elbo at firewall end). 2 other 1600 GTA heads I had, used on top of GTAj engines by Bruce Perry, were sleeved to small port and had matched ported later style 1600 manifolds. But these all would have been later North American mods I suspect as both were raced well into the 1970's.

Ciao

Ken

 

From the early GTA parts Book 10/1965.

GTA Manifold 105.02.01.060.02 with Raccordo (bypass Elbo)

 

From Later GTs/GTA parts Book unknown date .

GT, GTC & GTV Manifold 105.02.01.060.02

GTA Manifold 105.32.01.060.00

 

From TI, SUPER, & TI SUPER parts book 9/67

 

Ken,

I Just Looked Closely At My Manifold And It Has "1" Stamped At The Base (your lower left green circle) But Nothing At Your Upper Right Green Circle Location. In Addition, Was The Threaded Port (at number 1) Always There Or Added Later?

-John

 

I think that hole is present in most manifolds and usually has a hose barb in it as seen below. This would likely be blocked /plugged in race applications.

 

From 1600 Spider (Duetto) parts Book 3/67 pub 1251 and update 10/68 as in 3rd picture.

 

From GT 1300 Junior parts book 1/70 Pub. 1516

 

Referring valve cover type

I think that hole is present in most manifolds and usually has a hose barb in it as seen below. This would likely be blocked /plugged in race applications.

Ken, this hole is used starting with the 2nd series valve covers only which has the breather fitted at intake side; a hose´s connecting the fitting with the breather.

Early blocks using a breather at the rear end of the block should not have the hole in the manifold.

 

Here is another to add Ken. This is from a late 1965 1600 Spider Veloce. I've 2 in my shop now, but have seen about 20 over the years on late 65 Giulia's and early 66 Duetto's.
These lack the vacuum ports front and rear. There is a cast boss, undrilled on either end. Neither one in my shop has stampings or casting numbers except as I'll note in a moment.
Ports are rough, as cast but do have the standard bevel at the insulator / isolator side, ports 40 mm, bevel 43 mm. This particular example came to me from my customer and BB member Terry Rushbrook for restoration for his 65 Spider Veloce. He bought it from a shop that had removed it many years ago as an assembly with linkage, cold air box, and a nice pair of low mileage, large top 40DCOE Webers. It has the ground strap and dip-stick support. A complete assembly, always together. The only odd part is photo #2.
I can take more pictures of this variation while it's in my shop if anyone is interested.

 

So no casting mark where circled as when I blow it up I find a faint inverted 3 or is that my imagination. Maybe add a close up of the area to your post. And what is the port size both directions at the head?

 

I'll check Ken. I media cleaned it paying little attention to other details as I've seen a lot of these over the years.

 

Ken,

I've Come Across Another Intake Manifold With The Thread On Water Distribution Manifold. It Has A Port On The Back For The Brake Booster Check Valve, Has NO Tapped Hole In Front, Has Three Stampings In The Middle (really unlegible and if I had to guess the top left one looks like an inverted 1), Has A 0 Stamped In Front, Has Chamfered Port To 45mm On Carb Side And 38mm X 49mm Port Size On Head Side, An Interesting Aside Is That The Brake Booster Check Valve Is Made Of Aluminum (I've never seen one before), And A Different Looking Water Sending Unit.

-John

 

Early Screw in Thermostat Casting mark #7

Early Screw in Thermostat Casting mark #7 from ebay.

Alfa Romeo 105 Series Early Inlet Manifold Used | eBay

 

Cast #14

This one is from a 1600 Sprint GT. I don't know the exact year as I haven't been in contact with Alfa Archives yet, but according to Fusi it will be a late model (~1966).

The manifold is stamped with the usual small symbol and the number 14. It is possible that it is from a later model engine - I've only owned the vehicle for a brief time and know nothing of its provenance.

Port diameters are 40mm (carby side) and 37mm (engine side).

The thermostat housing is made by Flexider (Torino) and is fitted with a small and now likely unobtainable, thermostat.

Chris

 

This one is from a 1600 Sprint GT. I don't know the exact year as I haven't been in contact with Alfa Archives yet, but according to Fusi it will be a late model (~1966).

The manifold is stamped with the usual small symbol and the number 14. It is possible that it is from a later model engine - I've only owned the vehicle for a brief time and know nothing of its provenance.

Port diameters are 40mm (carby side) and 37mm (engine side).

The thermostat housing is made by Flexider (Torino) and is fitted with a small and now likely unobtainable, thermostat.

Chris

Hi Chris thanks for posting here.

My logic tells me that the drop in thermostats manifolds, which we are referring to in this thread as "late", had their own variations starting with the earliest (lowest) casting Mark #1 . So #14 is later still I believe than #1 .

Perhaps your whole engine is a late 1600. Does it have a spin on oil filter? Share the serial number and someone (Jim) may know more.

I agree with others that your GT should have a a manifold with screw in type thermostat, as seen up thread.

By the way, I seem to remember seeing Torino on a Thermostat housing and as far as I know they are the same dimensions as the other type.


Ken

 

I am just starting full mechanical restoration/rebuild on a 1600 GTV. It is a very original car I think from late 65/early 66. Saturday was a very BIG day driving a round trip of 600 km, stripping the suspension out, building a chassi trolley and then loading car and trailer etc and forgot to write down the chassis number to get a production date.

Yesterday I pulled down the engine down. Very good basis with little corrosion, thick head and few sins of the past to deal with... thank God.

One odd thing: Port size is 32 mm (1600 GTV, from what I understand), unlike the earlier Giulia Sprint ~37 mm ports. However, the inlet manifold has 37 mm ports (therefore a large mismatch). This to me is obviously incorrect and will have to be rectified by either sleeving the manifold or sourcing the correct unit.

Being such an orignial car, with little corrosion, I think this is the original manifold. I suppose it could be production error: i.e. a left over large port manifold mounted on a small port head....

Comments and thoughts, please?

 

Some 101 1600 heads (large port) failed early on in service and were replaced by early 105 small port heads. The manifolds were not included in the factory-dealer essentially free repair. The large port 101 1600 Veloce head I thought, went away with the introduction of the Duetto and GT's in production late 64 or early 65. I don't know exactly when. The reduction in head port size, made for a smoother idle, and a bit better low end torque, even with the large port manifold.
My opinion from my experience with these engines.