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Globedog12
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Joined: April 11, 2024
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Location: Atlanta, GA
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 Posted: Fri May 02, 2025 8:03 pm Post subject: New amc 2.0 heads |
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Just an fyi if anyone is interested. I bought a new set of amc 2.0 cylinder heads. I Cc’d all combustion chambers 6 times and got 56cc +/- ~.25 cc (probably due to technique and equipment) but I’m pretty happy with the results. Here are some photos. If anyone has any questions feel free.
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1976 VW Type 2 Original fuel injection |
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SGKent 
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Joined: October 30, 2007
Posts: 42040
Location: at the beach
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| Posted: Fri May 02, 2025 8:21 pm Post subject: Re: New amc 2.0 heads |
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double check all the air passages to make sure the flashing is trimmed out.
| Amskeptic wrote: |
| brightcourse wrote: |
| You are right Colin this is what I don't understand. Why pay to have it shipped back and look into the complete customer concerns. |
We will stick with your plan of action ( Plug n Play ) and see how it does.
If all is well, all is well.
If it runs hot again, I am still interested in the flash question.
(below, Saint Louis job, for those who did not see the pictures ...)
"0" deckheight ...
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| SGKent wrote: |
Here is the one Len did for me
Here is a late 2L head
Here is your head in St Louis
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airschooled
Air-Schooled
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Location: West Coast, USA
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| Posted: Sat May 03, 2025 10:00 am Post subject: Re: New amc 2.0 heads |
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AMC heads have their logo cast into the lower pushrod tube area. The terrible heads that Colin found are either counterfeits or AA brand.
I haven’t had many issues with AMC heads; two years ago the valves used to leak a little overnight with a soapy water test, but even those problems were gone on the last set I used. Any leakage from the exhaust valves during your CC measurements?
Robbie
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orwell84
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Joined: May 14, 2007
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Location: Plattsburgh, New York
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| Posted: Sat May 03, 2025 10:50 am Post subject: Re: New amc 2.0 heads |
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| The impression that I have of AMC heads is that the castings are good, but the hardware is not the best quality, but this is based on very old information. I have a set of Blueprint Specials that have upgraded hardware. I don’t think they are being produced currently, but I would guess that there are other shops that can do this work. I don’t know if the hardware used on AMC heads has improved or even if it was ever really that bad. |
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Globedog12
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Joined: April 11, 2024
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Location: Atlanta, GA
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| Posted: Sat May 03, 2025 5:26 pm Post subject: Re: New amc 2.0 heads |
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| airschooled wrote: |
AMC heads have their logo cast into the lower pushrod tube area. The terrible heads that Colin found are either counterfeits or AA brand.
I haven’t had many issues with AMC heads; two years ago the valves used to leak a little overnight with a soapy water test, but even those problems were gone on the last set I used. Any leakage from the exhaust valves during your CC measurements?
Robbie |
Luckily none.
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Globedog12
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Joined: April 11, 2024
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| Posted: Sat May 03, 2025 5:47 pm Post subject: Re: New amc 2.0 heads |
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| orwell84 wrote: |
| The impression that I have of AMC heads is that the castings are good, but the hardware is not the best quality, but this is based on very old information. I have a set of Blueprint Specials that have upgraded hardware. I don’t think they are being produced currently, but I would guess that there are other shops that can do this work. I don’t know if the hardware used on AMC heads has improved or even if it was ever really that bad. |
I’m using the supplied hardware so I guess I’ll find out after I get this thing running.  I’ve read enough and understand the risks. Everything is a compromise. For me this bus is a hobby and I’m fortunate enough to be able to do what I’m doing. If it all goes tits up I’ll be disappointed but it won’t bankrupt me. For now I’m having fun. Im also not looking to make an epic cross country journey. If I can drive around town, go to a brewery or two and maybe a night at a local state park I’ll be a happy man.
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SGKent
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| Posted: Sat May 03, 2025 10:16 pm Post subject: Re: New amc 2.0 heads |
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I think that whomever was supplying hardware on the AMC heads say 10 years ago, people were getting 40,000 miles on the low end of life, and 70,000 miles on the high end.
I also think that Len told me that he got bare AMC castings by the pallet when he was doing them. It may be that the hardware is controlled by whomever imports the castings. AMC may only provide the bare castings. I believe that is how VW did it too.
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orwell84
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Location: Plattsburgh, New York
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| Posted: Sun May 04, 2025 4:55 am Post subject: Re: New amc 2.0 heads |
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| Globedog12 wrote: |
| orwell84 wrote: |
| The impression that I have of AMC heads is that the castings are good, but the hardware is not the best quality, but this is based on very old information. I have a set of Blueprint Specials that have upgraded hardware. I don’t think they are being produced currently, but I would guess that there are other shops that can do this work. I don’t know if the hardware used on AMC heads has improved or even if it was ever really that bad. |
I’m using the supplied hardware so I guess I’ll find out after I get this thing running. I’ve read enough and understand the risks. Everything is a compromise. For me this bus is a hobby and I’m fortunate enough to be able to do what I’m doing. If it all goes tits up I’ll be disappointed but it won’t bankrupt me. For now I’m having fun. Im also not looking to make an epic cross country journey. If I can drive around town, go to a brewery or two and maybe a night at a local state park I’ll be a happy man. |
You’ll be absolutely fine then. |
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VWLover77
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| Posted: Sun May 04, 2025 6:41 am Post subject: Re: New amc 2.0 heads |
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| Globedog12 wrote: |
| I Cc’d all combustion chambers 6 times and got 56cc +/- ~.25 cc |
Is that just the measurement of the deep "swimming pool" combustion chamber, or does it include the volume to the "top" of the ~.032" step built into the AMC heads?
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SGKent
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| Posted: Sun May 04, 2025 11:13 am Post subject: Re: New amc 2.0 heads |
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| VWLover77 wrote: |
| Globedog12 wrote: |
| I Cc’d all combustion chambers 6 times and got 56cc +/- ~.25 cc |
Is that just the measurement of the deep "swimming pool" combustion chamber, or does it include the volume to the "top" of the ~.032" step built into the AMC heads? |
probably includes the step. The step is there to replace the sealing rings VW used to use.
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airschooled
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| Posted: Sun May 04, 2025 2:54 pm Post subject: Re: New amc 2.0 heads |
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The last set of AMC 2L heads I measured were 55-56cc without the step. My syringe is basic, and 1cc doesn't make any difference on a stock build.
I don't measure the steps with the disc/liquid, but when I reverse the compression calculator numbers, the step seems to be worth 5-6cc, which is important enough to get right regardless of where you include it in your calculations. As chamber volume or deck height, but not both.
Robbie
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Globedog12
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| Posted: Sun May 04, 2025 5:53 pm Post subject: Re: New amc 2.0 heads |
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That includes the step. I meant to take some pics but did not. The plexi disc I used sat on top of the step. Filling in the deeper pool and the flat part of the head up to the step. I’ll get out the syringe tomorrow and post a few pictures. As long as I ccd that correctly having the step in my volume measurement the only deck height I use is between the top of the piston at tdc and the sealing surface of the jug correct?
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SGKent
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| Posted: Sun May 04, 2025 6:03 pm Post subject: Re: New amc 2.0 heads |
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| Globedog12 wrote: |
| That includes the step. I meant to take some pics but did not. The plexi disc I used sat on top of the step. Filling in the deeper pool and the flat part of the head up to the step. I’ll get out the syringe tomorrow and post a few pictures. As long as I ccd that correctly having the step in my volume measurement the only deck height I use is between the top of the piston at tdc and the sealing surface of the jug correct? |
it depends on the calculator. If it has a spot for head gasket, you can use the step as the head gasket thickness. If it does not have a spot for head gasket, you can add it to the deck height, or you can add it to the CC of the head and just use the cylinder deck height.
Be sure to bolt the cylinders down, that will change the height quite a bit.
you can see the aluminum blocks I had made to hold the cylinders down. I have 4 sets so each cylinder gets calculated.
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Globedog12
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| Posted: Sun May 04, 2025 6:23 pm Post subject: Re: New amc 2.0 heads |
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I have some aluminum square stock to make a setup like that.
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SGKent
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| Posted: Sun May 04, 2025 6:44 pm Post subject: Re: New amc 2.0 heads |
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| Globedog12 wrote: |
| I have some aluminum square stock to make a setup like that. |
you will be happy if you do. It makes taking the calculations so much easier. I gap all the rings on the cylinders to make sure they are within spec. Never had one that wasn't but it is habit. Since the rings are off, I do all the measuring with the rings off, then pull it apart after marking each item, do a thorough wash with hot soapy water and compressed air to avoid flash rust. WD-40 the cylinders, put the rings on and slowly start the process of oiling the cylinders, pistons, wrist pins, etc.. Make sure the arrows are in the correct direction maybe five times (habit to look again). Make sure the circlips are in all the way - if you are not familiar, a circlip has a flat and a rounded side - the flat side goes out. Put some RTV on the cylinder base and if the heads are ready to go they go on. If not I used the aluminum blocks to hold the cylinders down while I work on another one.
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Globedog12
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Location: Atlanta, GA
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| Posted: Mon May 05, 2025 4:17 pm Post subject: Re: New amc 2.0 heads |
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| SGKent wrote: |
| Globedog12 wrote: |
| I have some aluminum square stock to make a setup like that. |
you will be happy if you do. It makes taking the calculations so much easier. I gap all the rings on the cylinders to make sure they are within spec. Never had one that wasn't but it is habit. Since the rings are off, I do all the measuring with the rings off, then pull it apart after marking each item, do a thorough wash with hot soapy water and compressed air to avoid flash rust. WD-40 the cylinders, put the rings on and slowly start the process of oiling the cylinders, pistons, wrist pins, etc.. Make sure the arrows are in the correct direction maybe five times (habit to look again). Make sure the circlips are in all the way - if you are not familiar, a circlip has a flat and a rounded side - the flat side goes out. Put some RTV on the cylinder base and if the heads are ready to go they go on. If not I used the aluminum blocks to hold the cylinders down while I work on another one. |
Thanks. I’ve been knocking around in my head a sequence to write out and this gives me a good place to start.
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Globedog12
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| Posted: Wed May 07, 2025 4:41 pm Post subject: Re: New amc 2.0 heads |
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A pic of volume measurement of combustion chamber including step.
I just did this quick for the picture. I know there is a small bubble under there
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SGKent
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| Posted: Wed May 07, 2025 6:18 pm Post subject: Re: New amc 2.0 heads |
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I found that pressing down just inside the bubble sometimes made enough slope in the plastic that the bubble escaped. Other times I played the kids game of getting rid of the small bubble. Good job.
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