TheAMCForum.com Homepage
Forum Home Forum Home > The Garage > AMC 6 Cylinder Engine Repair and Modifications
  New Posts New Posts RSS Feed - [MASSIVE UPDATE] Mexican Engine Heads
  FAQ FAQ  Forum Search   Events   Register Register  Login Login

Click for TheAMCForum Rules / Click for PDF version of Forum Rules
Your donations help keep this valuable resource free and growing. Thank you.

[MASSIVE UPDATE] Mexican Engine Heads

 Post Reply Post Reply Page  123 7>
Author
Message Reverse Sort Order
mitchito View Drop Down
AMC Apprentice
AMC Apprentice
Avatar

Joined: Oct/02/2016
Location: Brooklyn, NY
Status: Offline
Points: 199
Post Options Post Options   Thanks (0) Thanks(0)   Quote mitchito Quote  Post ReplyReply Direct Link To This Post Topic: [MASSIVE UPDATE] Mexican Engine Heads
    Posted: Jun/01/2019 at 7:48am
On my last trip to Mexico I brought back a few intakes and 2100 carbs which I had rebuilt. I will have one or 2 for sale as I decided to keep the single barrel on my Gremlin and I had one extra before that. I will bring them to the AMO meet in St. Louis. I did have one polished and it came out really great. 

As for the 4.0 being better, yes, but a pain to mount the power steering pump. No such issue with the 4.6 head
1982 Rambler Lerma
1981 Rambler Lerma coupe
1978 American (Concord base)
1977 Gremlin
1976 Pacer X
Back to Top
Thikstik View Drop Down
AMC Addicted
AMC Addicted
Avatar

Joined: Mar/20/2008
Location: Alabama
Status: Offline
Points: 1317
Post Options Post Options   Thanks (0) Thanks(0)   Quote Thikstik Quote  Post ReplyReply Direct Link To This Post Posted: May/23/2019 at 12:10pm
Originally posted by farna farna wrote:

Well, the 4.0L head is better than the VAM head. So there really is no reason to spend the money to ship one across the border, except for curiosity. The intake, however, may be worth it. While there are adapters for the 2300 to the AMC 2Vintake an intake made for the 2300 should be better.

The 4.0L block has about the same bore as the 282. You should be able to use the 282 head on it without notching. Again, with the excellent 4.0L head there really is no point in swapping. The only gain by using a 282 block is that you can drive a mechanical fuel pump, but you get a lot of weight in return.

I'm not putting down the VAM effort at all. At the time it was bigger and a bit better in some respects than the US sixes. The 4.0L just took those developments one step further.

Great info on the VAM sixes, do keep it coming!!

Agreed.  Flow technology has come along way and bigger ports, valves arent always the best.  At full out maybe so but not under the curve where they can hurt low end by limiting air charge velocity.
Great info.  Would love to just switch intake.

75 gremlin x, jeep 4L headed 258,Clifford cam, intake,header. 390 holley. I want a 282 VAM motor!

AC/PS/PDB.

72 AMX , 304 2bbl, 3speed, now disks...probably will sell, want an automatic /AC.

Back to Top
Rambler Mexicano View Drop Down
AMC Addicted
AMC Addicted
Avatar

Joined: Mar/05/2011
Location: Guadalajara
Status: Offline
Points: 679
Post Options Post Options   Thanks (0) Thanks(0)   Quote Rambler Mexicano Quote  Post ReplyReply Direct Link To This Post Posted: May/16/2019 at 8:48pm
Originally posted by farna farna wrote:

Those "cooling ports" you mention are likely ports to wash out casting sand. I don't think there are matching opening on the block so water can circulate through them. Basically just the lowest part of the head water jacket, sealed by the head gasket. If there are matching openings in the block they are indeed for cooling...


You're right Frank, those ports are nonexistent in the engine block. Thanks for pointing this out.
Mauricio Jordán

Cuando no se es una empresa famosa se deben hacer mejores automóviles.
- Vehículos Automotores Mexicanos S. A. de C. V.
Back to Top
farna View Drop Down
Supporter of TheAMCForum
Supporter of TheAMCForum
Avatar
Moderator Lost Dealership Project

Joined: Jul/08/2007
Location: South Carolina
Status: Offline
Points: 16151
Post Options Post Options   Thanks (0) Thanks(0)   Quote farna Quote  Post ReplyReply Direct Link To This Post Posted: May/16/2019 at 6:05am
Those "cooling ports" you mention are likely ports to wash out casting sand. I don't think there are matching opening on the block so water can circulate through them. Basically just the lowest part of the head water jacket, sealed by the head gasket. If there are matching openings in the block they are indeed for cooling...
Frank Swygert
Back to Top
SC397 View Drop Down
AMC Addicted
AMC Addicted
Avatar

Joined: Apr/30/2009
Location: Michigan
Status: Offline
Points: 2948
Post Options Post Options   Thanks (1) Thanks(1)   Quote SC397 Quote  Post ReplyReply Direct Link To This Post Posted: May/15/2019 at 3:57pm
Thank you for all of the work in writing this up Mauricio!
Back to Top
Rambler Mexicano View Drop Down
AMC Addicted
AMC Addicted
Avatar

Joined: Mar/05/2011
Location: Guadalajara
Status: Offline
Points: 679
Post Options Post Options   Thanks (0) Thanks(0)   Quote Rambler Mexicano Quote  Post ReplyReply Direct Link To This Post Posted: May/15/2019 at 3:40pm
Head to Head, Side by Side.

VAM 282 Heads, 1982-1983 unit versus 1984-1986 unit.

Spark Plugs' Side - 9 Pictures in This One

1982-1983 282 Head on Top

1984-1986 282 Head on the Bottom



From Left to right, cylinders 6 to 1 on Top Head and from 1 to 6 on Bottom Head.

Both have the same height, the same spark plug size and the inclination of the spark plug is also the same. Portions for the AC/Alternator and ignition coil are the same. The main difference between both heads is evident, mainly reduced to the flat top for the plastic valve cover in the 1984-1986 unit.



From left to right, Cylinders 6-5-4-3 on top and 1-2-3-4 on the Bottom.



From left to right, Cylinders 4-3-2-1 on top and 3-4-5-6 on the Bottom.



Closer look, all spark plugs in place. From left to right, cylinders 6-5-4 on top and 1-2-3 on the bottom.



Closer look, no spark plugs, more visible outlets. From left to right cylinders 3-2-1 on top and 4-5-6 on the bottom.



Closer look, from left to right cylinders 6-5 on top and 1-2 on the bottom, sparks pugs on top.



Closer look, from left to right cylinders 4-3 on top and 3-4 on the bottom, sparks pugs on top.



Closer look, from left to right cylinders 2-1 on top and 5-6 on the bottom, sparks pugs on top.



Closest look, cylinders 6 on top and 1 on the bottom.

----- ----- ----- ----- ----- -----
- ----- ----- ----- ----- ----- -----

Both Engine Heads now both shown straight instead of one upside down. Once again, the 1982-1983 unit on top and the 1984-1986 unit on the bottom.



Notice the hollows for the Alternator/AC and the distributor coil, the gap for the distributor seems to be slightly larger in the 1984-1986 head. There is some thicker metal portions near cylinders 2 and 5 on the bottom head not present on the top one. Also one of these portions in missing on the cylinder 6 corner of the bottom head.



Cylinders 6 to 4 from left to right, spark plugs in place.



Cylinders 4 to 1 from left to right, visible spark plug outlets.



Cylinders 6 and 5 from left to right. Closer look.



Cylinders 4 and 3 from left to right. Closer look.



Cylinders 2 and 1 from left to right. Closer look.



Cylinders 6, closest look.

----- ----- ----- ----- ----- -----
- ----- ----- ----- ----- ----- -----

Vertical View of Both Heads

1984-1986 unit to the left and 1982-1983 to the right. Virtually exact spark plug inclination on both heads



From to to bottom, Cylinders 1 to 4 on the left head and 3 to 6 on the right head.



From to to bottom, Cylinders 1 to 3 on the left head and 4 to 6 on the right head, spark plugs in place.



From to to bottom, Cylinders 1 to 1 on the left head and 5 to 6 on the right head, spark plugs in place.

----- ----- ----- ----- ----- -----
- ----- ----- ----- ----- ----- -----

Valve Train

1982-1983 head on top and 1984-1986 head on the bottom



Valves and Springs are the same in both heads. The only true difference here is the flat spark plugs' side for the plastic valve cover on the bottom head (metal on the top head).



From left to right, cylinders 6 to 3 on both heads.

It is visible that the hollows for the pushrods in the 1982-1983 head (top) are totally round while those on the 1984-1986 head (bottom) are larger.



From left to right, cylinders 3 to 1 on both heads.

The numbers and internal etchings of the heads are different from one model to the other.



Cylinders 6 and 5 from left to right.

Notice the upside down VAM engraving on the bottom head.



Cylinder 6 valves, springs and rocker arm mounts.



Rear view of both heads.

Notice that both heads have the temperature sensor in the same spot near the farthest bolt hollow.



This picture showcases a MAJOR difference between both heads.

The internal bolt hollows fixing the head to the engine block are placed LOWER in the 1984-1986 head  than in the 1982-1983 one. Thus, the seven bolts on this side are SHORTER than the other seven external ones. The 1982-1983 head has all 14 bolts of the same length.

----- ----- ----- ----- ----- -----
- ----- ----- ----- ----- ----- -----

Combustion Chamber Sides

1982-1983 head on top and 1984-1986 head on the bottom.



In both heads, the combustion chamber size is the same. Both valve diameters are lso shared between them.

Thers is one major difference though. The 1984-1986 head (bottom) has ten round cooling ducts instead of just five like in the 1982-1983 head.

Also, the spark plug seats have an additional metal portion linking them to the distributor's edge. The hollows under the spark plug next to the combustion chamber are also smaller.



From left to right cylinders 1 to 4.



From left to right cylinders 3 to 6.



From left to right cylinders 1 to 2.



From left to right cylinders 3 to 4.



From left to right cylinders 5 to 6.

----- ----- ----- ----- ----- -----
- ----- ----- ----- ----- ----- -----

Ports' Side

NOTICE:

Unlike al previous pictures, in this section the head on top is actually the 1984-1986 one. The on in the bottom is the 1982-1983 one.



The intake ports on both heads are exactly the same.

However, the exhaut ports are another story.

The exhaust ports on the 1984-1986 head have the same width as on the 1982-1983 one, BUT they are TALLER, and thus larger. The 1984-1986 does have a nigher exhaust capacity.



Exhaust port 1 and Intake ports 1 and 2.



Intake ports 2 and 3 plus exhaust port 2.



Intake ports 4 and 5 plus exhaust port 5.



Intake ports 5 and 6 plus exhuast port 6.



Exhaust ports 3 and 4.



1982-1983 Intake ports for cylinders 1 and 2.



1984-1986 Intake ports for cylinders 1 and 2.
Mauricio Jordán

Cuando no se es una empresa famosa se deben hacer mejores automóviles.
- Vehículos Automotores Mexicanos S. A. de C. V.
Back to Top
Rambler Mexicano View Drop Down
AMC Addicted
AMC Addicted
Avatar

Joined: Mar/05/2011
Location: Guadalajara
Status: Offline
Points: 679
Post Options Post Options   Thanks (0) Thanks(0)   Quote Rambler Mexicano Quote  Post ReplyReply Direct Link To This Post Posted: May/17/2018 at 2:36pm
Everyone saw the pictures of my original 1981 282 head.

Now I was finally able to to take down the head in my car and take an extensive high quality photo session with my professional camera due to the faded out lens on my cell phone.

This head is a 1984-1986 design used in VAM Jeeps. It is virtually the same as the 1982-1983 heads, the only diference being the valve cover, metal in the 1982-1983 head and plastic in the 1984-1986 one.

Valve size and spark plug size are the same.

This one seems to be the same as the one I posted last year in this topic.



Full view of all ports, intake and exhaust.



Intake ports, cylinders 1 and 2.



Intake port, cylinder 3.



Intake port, cylinder 4.



Intake ports, cylinders 5 and 6.



Exhaust port, cylinder 1.



Exhaust port, cylinder 2.



Exhausts ports, cylinders 3 and 4.



Exhaust port, cylinder 5.



Exhaust port, cylinder 6.




Top of the head: valve ends and springs, rocker mounts, ports still visible.



Top of the head again, ports no longer visible. The seven internal bolt hollows and pushrod hollows more visible.



Water connection hollow.



Water connection hollow, with flash.



Bottom side, all six combustion chambers with the valves in place.



Combustion chambers, cylinders 1 and 2.



Combustion chambers, cylinders 3 and 4.



Combustion chambers, cylinders 5 and 6.



Combustion chambers, cylinders 1, 2, and 3.



Combustion chambers, cylinders 4, 5, and 6. 
Mauricio Jordán

Cuando no se es una empresa famosa se deben hacer mejores automóviles.
- Vehículos Automotores Mexicanos S. A. de C. V.
Back to Top
farna View Drop Down
Supporter of TheAMCForum
Supporter of TheAMCForum
Avatar
Moderator Lost Dealership Project

Joined: Jul/08/2007
Location: South Carolina
Status: Offline
Points: 16151
Post Options Post Options   Thanks (0) Thanks(0)   Quote farna Quote  Post ReplyReply Direct Link To This Post Posted: Dec/27/2017 at 7:25am
If you get the "Ooops!"message from Photobucket you can install a work-around if you are using Firefox or Chrome. Microsoft browsers don't allow third party add-ons/plug-ins, so no fix for those. There is a fix for Safari and Anroid devices as well. Just search "photobucket fix".
Frank Swygert
Back to Top
SIXPAK View Drop Down
AMC Apprentice
AMC Apprentice
Avatar

Joined: Apr/05/2009
Location: Ohio
Status: Offline
Points: 56
Post Options Post Options   Thanks (0) Thanks(0)   Quote SIXPAK Quote  Post ReplyReply Direct Link To This Post Posted: Dec/26/2017 at 6:19pm
Originally posted by Rambler Mexicano Rambler Mexicano wrote:

SIXPAK, all VAM engines had the same stroke as AMC sixes, the bore was the one that was different. The 252 has the 232 stroke while the 282 has the 258 one.

Thanks. Im completely aware of the bores and strokes but it was rumored that the length of bore may be a little different than a 4.0 block. Thats why I was asking. ;) 
Sand is for Racing Asphalt is for getting there!
Back to Top
Rambler Mexicano View Drop Down
AMC Addicted
AMC Addicted
Avatar

Joined: Mar/05/2011
Location: Guadalajara
Status: Offline
Points: 679
Post Options Post Options   Thanks (0) Thanks(0)   Quote Rambler Mexicano Quote  Post ReplyReply Direct Link To This Post Posted: Dec/26/2017 at 4:10pm
SIXPAK, all VAM engines had the same stroke as AMC sixes, the bore was the one that was different. The 252 has the 232 stroke while the 282 has the 258 one.

I have some news here, some of them related to the pictures of page 5 and this one.

I might have the chance of documenting four VAM heads in the following weeks.

1.-

I will be taking my 1977-1982 VAM regular production 282 head to a shop to have the valves removed so I can take pictures of the intake ports and compare them to ones the 1984-1986 Jeep head.

2.-

Also, a friend of mine needs to do routine maintenance to the head on his car, which is a 1982-1983 car line 282 head with the smaller 5/8 sparkplugs, internally-rounded out intake ports and the metal valve cover.

This is a chance to finally confirm if this head is the same as the 1984-1986 Jeep unit, to finally know for sure if the only difference is the plastic valve cover in newer version.

Unfortunately, he's in another city and I won't be able to be there when that happens. I just hope he doesn't let me down, which has happened more than once.

3.-

I will have a chance to take more pictures of the 252/1971-1972 282 head with rocker shaft and small valves.

The owner of the 1971 Javelin, in part due to my recommendations, ended up buying a 1977-early 1982 head with quench-type combustion chambers, large valves and independent rockers for his car.

He will keep his original head as a spare and is looking for an industrial chrome shop to rebuild the rocker shaft to keep it in working condition.

This means that the original head now assembled in the engine will inevitably go down, thus opening up a chance to document not just the combustion chambers but the internal part of the intake ports and make a comparison with the ones in the 1977-1986 heads.

4.-

A friend of mine owns a 1974 Classic DPL (Matador sedan) that has been sitting in a repair shop for some time, I was told they will restart work on the car in the following weeks/months. Part of the aspects to work on the car is the engine.

This is a very important opportunity, because this car has what I call the "third generation" 282.

The "first generation" is the 1971-1972 with 9.5:1 compression ratio, rocker shaft and small valves.
The only difference between one year and the other is that the 1971 version still has the starter on the intakes' side of the engine while the 1972 version's is on the distributor's side.

The "second generation" is the 1973 282, keeping the 9.5:1 compression ratio BUT changing to independent rockers and large valves.

The "third generation" is the 1974 282, changing to 8.5:1 compression ratio, keeping the indendent rocks and large valves. It also kept the same points distributor and Carter ABD carburetor as all 1971-1973 282s.

As far as my knowledge goes, the only difference between this engine and the 1973 version would be thecompression ratio, which happned due to the 1971-1973 flat pistons being replaced in favor of dished units. As far as I know the rest is the same: head, head gasket, head height, etc.

This time I will be able to document the 1974 head, which might be the same as the 1973 head. I'll try to fully take pictures of the whole head: combustion chambers, ports. I just hope they don't keep on delaying/postponing the repair of the car.

These are the updates that will be coming soon.


Edited by Rambler Mexicano - Dec/26/2017 at 4:13pm
Mauricio Jordán

Cuando no se es una empresa famosa se deben hacer mejores automóviles.
- Vehículos Automotores Mexicanos S. A. de C. V.
Back to Top
 Post Reply Post Reply Page  123 7>
  Share Topic   

Forum Jump Forum Permissions View Drop Down



This page was generated in 0.172 seconds.
All content of this site Copyright © 2018 TheAMCForum unless otherwise noted, all rights reserved.
PROBLEMS LOGGING IN or REGISTERING:
If you have problems logging in or registering, then please contact a Moderator or