Strange Cylinder Head Question PLEASE HELP

AlteWagen · Troll Joined: February 23, 2007 Posts: 8501 Location: PNW

A friend of mine got some heads from a machine shop and they dont look like a regular heads.

First of all they only have 6 main fins compared to 8 on a standard head, and NO they are not cut off as they still have the "ears" on the bottom fin.

Second they only have 35cc chambers and a VERY shallow depth from the bottom fin to the sealing surface.

Third they have a wierd horizantal threaded 8mm hole on the #1 or #4 piston on the SIDE of the head right above the hole for the valve cover bail

Fourth a strange part number with additional numbers and NO letter designation. 040 101 375 16

They have stock size valves 35x32 but have long reach plug threads. He was told they are regular heads but I say no way. Someone told him they are early replacement FI heads but do not have the larger valve stem. They have a BR stamping in the spring area so they look like Brazil heads and also have REALLY small washer bosses so that regular 8mm head stud washers barely fit. There is NO WAY that these heads can use a 10mm head stud!! Intake ports look like later 041 style with no valve stem boss but have early small exhaust ports. They also have 041 full bottom fin with no full middle fin when looking down from the intake port side.

Are these industrial heads? Early factory racing heads for super high compression? Aircraft??

He is building a 74x90 engine and when setting the deck height and comression ratio the amount of shims needed is huge to compensate for the super small chamber size. He is unable to use copper head gaskets due to the almost non exsistant cylinder seating area. If he uses a .060 copper head gasket the cylinder will not locate in the head correctly even after torque. WTF???

glutamodo · Posted: Tue Apr 14, 2009 11:43 pm Post subject:

I can't say I've ever seen heads that look quite like you describe. Sounds like something to take some photos of and post in the Gallery for others to reference in the future. No way they could have been Bug FI heads, those had smaller valves.

So with that shallow depth, does that mean no room for a "step cut" to increase the combustion chamber size?

I just Googled that head part/casting number and came up with this:

http://www.partssave.com/item.cfm?id=350155593015

It's an ad for a matched head and two pistons/cylinders, I'll quote the ad:

"FROM A MEXICAN BUILT NEW LONG BLOCK. THEY ARE USEABLE ONLY WITH THE MEXICAN BUILT LONG BLOCKS AS THEY HAVE DIFFERENT STYLE PISTON AND CYLINDERS AND COMBUSTION CHAMBERS. HEAD NUMBER--040 101 375 16--PISTON AND CYLINDERS ARE DISHED VW"

Hope that info is of some use...
-Andy

Bruce · Posted: Tue Apr 14, 2009 11:57 pm Post subject:

Those are alcohol heads. In stock form, this 1600 had a CR of 10.5:1.

Don't even think about using them on a gas engine. Less fins means they will overheat. Super high compression means they will ping badly.
_________________

AlteWagen · Troll Joined: February 23, 2007 Posts: 8501 Location: PNW

turboblue · Posted: Wed Apr 15, 2009 8:10 am Post subject:

Bashr52 · Posted: Wed Apr 15, 2009 8:36 am Post subject:

Look at the dish in them pistons Shocked

Image may have been reduced in size. Click image to view fullscreen.

joescoolcustoms

vwfanatic67 · Posted: Tue May 08, 2012 5:08 pm Post subject:

just acquired the exact heads that you are referring to. Did any one figure out the story on them.
_________________
"white trash but worth every cent"

SBS #74
52 Split Beetle
60 Panel
65 Notchback
More if my wife would let me!

glutamodo · Posted: Tue May 08, 2012 5:23 pm Post subject:

Which ones, the 6 fin with the high compression small chambers or the 8 fin with the larger chambers?

vwfanatic67 · Posted: Tue May 08, 2012 5:55 pm Post subject:

6 fins small chambers
_________________
"white trash but worth every cent"

SBS #74
52 Split Beetle
60 Panel
65 Notchback
More if my wife would let me!

glutamodo · Posted: Tue May 08, 2012 5:57 pm Post subject:

I'd say go with what Bruce said... an engine set up to run alcohol.

mark tucker · Posted: Tue May 08, 2012 8:30 pm Post subject:

do some chamber work&piston work & use them.

modok · Posted: Tue May 08, 2012 8:33 pm Post subject:

Is anybody crazy enough to use them with 94mm WBX pistons and rods Very Happy

AlteWagen · Troll Joined: February 23, 2007 Posts: 8501 Location: PNW

Thought I would add this thread for more info on these heads

http://www.thesamba.com/vw/forum/viewtopic.php?p=6863065#6863065

R-Baja · Posted: Fri Apr 24, 2015 9:54 pm Post subject:

Hot VWs Magazine did a cylinder head buyers guide in one of their issues, December 2010, and it shows the 6 fin head made in Brazil with 35x32.5 valves and high compression combustion chambers. Original VW/AUDI casting.

R-Baja · Posted: Fri Apr 24, 2015 9:55 pm Post subject:

AlteWagen, did you ever compile a photo thread of all the various cylinder heads?

Jacco Verveer · Samba Member Joined: February 11, 2010 Posts: 399

was hoping to have these as spare but didnot look at the chambers:)

no way off using these ? because i now need heads Sad

PumaVW79

mark tucker

other than small valves and rust on the seats whats rong?do they use a longer valve or is the engine just narrower?/head shorter?

Pruneman99

Maybe someone could dish some pistons in the shape of the combustion chamber and they could be used? Not sure if there is a piston with a thick enough top to make that work or not. Maybe one of the machinists could jump in on that. Just an idea.


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