Heater Box/Exhaust conversion from 77 to 72-74 Question FAQ

Karl · Posted: Sun Nov 16, 2008 12:06 pm Post subject:

I have only 1 left front lower. I have no 72-74 right front lowers with the square hole. I have 3 79 Cal right front lowers without the square hole which is good for FI engines.

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BTW, the right lower tin is also different for 72-74 carb'd engines and 79-83 FI engines.

Carb'd engines have a hole for the 3rd line off the fuel pump:

FI engines do not have the hole:

EZ Gruv · Posted: Sun Nov 16, 2008 12:27 pm Post subject:

Karl · Posted: Sun Nov 16, 2008 1:32 pm Post subject:

Yes, O is the left front lower.

Here are some pics to show what they look like and the differences:

Here is the 72-74 lower tin, notice the curve at the front where the screw holes go to the front lower tin.

Here is the O tin, the correct 72-74 left front lower.

Here you will see where the tin screws match up.

Here is O but this is the 79-83 Calif ONLY left front tin. [Bus Boys is wrong when they say 72-74 is the same as 80-83 ALL]

Here is the left lower, 79 Calif ONLY. Look at the curve where the holes are to mount it to the left front lower tin. It has a narrow lip on the left side.

Here is the same piece except it is 80-83 Vanagon Calif ONLY. Same curve on the front edge, but a wider lip on the left.

Here is the 79 Calif ONLY left side together to show the screw alignment.

This is why Bus Boys is wrong. Here are the Calif ONLY left side tin stacked on top of each other. The lower one is Vanagon with the wider lip. Both show the exact same front edge curve. Both use the same left side exhaust manifold with the cat under the head.

jimjxsn · Samba Member Joined: December 05, 2007 Posts: 23

White99z · Posted: Tue Nov 18, 2008 11:00 pm Post subject:

Does anyone that has done this have an approximate cost for the swap? I am facing these same issues right now.

EZ Gruv · Posted: Sat Nov 22, 2008 4:48 pm Post subject:

Hey Karl, thanks for the tin pieces! They were way cleaner than all the other parts that I have for this swap!

Here is a pic of just about everythig:

One issue though: I pulled the heater boxes out of storage this morning and found this on the right side box:

Looks like the casing is coming apart at the seam! Oh boy, what to do now?
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Karl · Posted: Sat Nov 22, 2008 5:10 pm Post subject:

Carefully open the crimp and rehook the bottom lip. Then close the crimp with vise grips.

EZ Gruv · Posted: Sat Nov 22, 2008 5:13 pm Post subject:

RZAR · Samba Member Joined: September 01, 2007 Posts: 725

busdaddy · Posted: Sun Apr 19, 2009 10:09 am Post subject:

Read this thread, it's the preheat for carbs.
http://www.thesamba.com/vw/forum/viewtopic.php?t=337828
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vw76westy · Posted: Mon Apr 20, 2009 1:26 am Post subject:

how different are the tins from a 80-83
could you use tin from these years

RZAR · Samba Member Joined: September 01, 2007 Posts: 725

Ok I have the chance to do this conversion due to an early engine failure on my fairly new rebuilt engine. The engine is fixed and dressed except for the exhaust. I had all the "new" '72 tins powder coated to match my OG tins and the '72 HE's will be done Tuesday. One question I have is there another support bracket for the HE's other then the ALT/HE support? The exhaust system is supported on the right side by the atl. braket but what about the other side?

germansupplyscott · Posted: Sun Apr 26, 2009 10:01 am Post subject:

it's supported on the left by one of these:

http://www.germansupply.com/xcart/customer/product.php?productid=16553

there's a bit more info here:

http://www.thesamba.com/vw/classifieds/detail.php?id=750293

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RZAR · Samba Member Joined: September 01, 2007 Posts: 725

germansupplyscott · Posted: Sun Apr 26, 2009 4:38 pm Post subject:

RZAR · Samba Member Joined: September 01, 2007 Posts: 725

Just ordered it from your site. Thanks.

vw76westy · Posted: Sun Apr 26, 2009 11:05 pm Post subject:

germansupplyscott · Posted: Mon Apr 27, 2009 5:33 am Post subject:

sure, will do. we have reproductions coming for both of them.
_________________
SL

RZAR · Samba Member Joined: September 01, 2007 Posts: 725

Finished the conversion and all I have to say is what a difference in heat output! The early HE's are a much better design. There was nothing wrong with my OG 77 heater boxes but since I had the engine apart and had a complete 72 setup I went with the conversion. Also it is so much simpler than the later setup I replaced so no more exhausts leaks. So no I have awesome heat just in time for Summer in San Diego. Laughing


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