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VW MKIII-A3/B4 TDIs This is a discussion about MKIII-A3/MkIII Jetta/Golf (<99.5) and B4 Passats (96,97) TDI's. Non TDI related postings will be moved or removed.

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Old September 16th, 2017, 10:56   #1
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Default ALH head on AHU block?

Like the title says. Not sure if this has been answered somewhere else but doing some research for a future project. Want to use a good AHU block but use an ALH head so i can have a VNT, unleaking valve cover etc
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Old September 16th, 2017, 11:10   #2
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I've read it doesn't fit. A search will bring up the details.
Saying no to gas for 25 years:

Current: 02 Jetta, Auto; 98 Jetta, 5 Spd; 98 Dodge, 5 Spd, SB, 4x4; 84 Grand Wagoneer with Nissan SD33T, NV4500, Dana 300, Reverse Cut Dana 44, Dana 60

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Old September 16th, 2017, 11:18   #3
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Old September 17th, 2017, 22:20   #4
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They're quite different, definitely won't fit.

There's nothing about the head that gives you the ability to use a VNT. All 8V heads have the same exhaust ports.

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Old September 18th, 2017, 06:46   #5
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Ports and bolt spacing are different - just do an image search on ALH AHU head gasket, and you'll see that they don't match.

VNT on an AHU? many have converted. Generally requires fabrication work on the rear engine mount, and a tune of course.

Proudly installing things where they're not supposed to go since 1996!
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